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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 11-K

(Mark One)

For the fiscal year ended December 31, 2010

OR

For the transition period from              to             

Commission file number: 001-15451

UPS Savings Plan

United Parcel Service, Inc.

55 Glenlake Parkway, NE

Atlanta, Georgia 30328

Explanatory Note:

The UPS Savings Plan (the “Plan”) is a voluntary defined contribution plan established for employees of United Parcel Service of America, Inc. (“UPS”) who are not members of a collective bargaining unit and who satisfy the participation requirements of the Plan. The UPS Qualified Stock Ownership Plan (the “QSOP”) was a voluntary defined contribution plan established for employees of UPS and certain subsidiaries of UPS who were not members of a collective bargaining unit and who satisfied the participation requirements of the QSOP. Effective January 1, 2009, the QSOP was discontinued as a separate plan and the UPS Class A common stock investment was added to the Plan as a new investment option called the UPS Stock Fund.

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UPS Savings Plan

Financial Statements as of and for the

Years Ended December 31, 2010 and 2009,

Supplemental Schedules as of and for the

Year Ended December 31, 2010, and

Report of Independent Registered Public Accounting Firm

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UPS SAVINGS PLAN

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Administrative Committee of and Participants in the

UPS Savings Plan

Atlanta, Georgia

We have audited the accompanying statements of net assets available for benefits of the UPS Savings Plan (the “Plan”) as of December 31, 2010 and 2009, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2010 and 2009, and the changes in net assets available for benefits for the years then ended in conformity with accounting principles generally accepted in the United States of America.

Our audits were conducted for the purpose of forming an opinion on the basic financial statements taken as a whole. The supplemental schedules of (1) assets (held at end of year) as of December 31, 2010, and (2) reportable transactions for the year ended December 31, 2010, are presented for the purpose of additional analysis and are not a required part of the basic financial statements, but are supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. These schedules are the responsibility of the Plan’s management. Such schedules have been subjected to the auditing procedures applied in our audit of the basic 2010 financial statements and, in our opinion, are fairly stated in all material respects when considered in relation to the basic financial statements taken as a whole.

/s/ Deloitte & Touche LLP

Atlanta, Georgia

June 24, 2011

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UPS SAVINGS PLAN

STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS

AS OF DECEMBER 31, 2010 AND 2009

(In thousands)

See notes to financial statements.

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UPS SAVINGS PLAN

STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS

FOR THE YEARS ENDED DECEMBER 31, 2010 AND 2009

(In thousands)

See notes to financial statements.

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UPS SAVINGS PLAN

NOTES TO FINANCIAL STATEMENTS

AS OF AND FOR THE YEARS ENDED DECEMBER 31, 2010 AND 2009

General — The UPS Savings Plan (the “Plan”) is a voluntary defined contribution plan established for employees of United Parcel Service of America, Inc. (UPS) who are not members of a collective bargaining unit and who satisfy the participation requirements of the Plan, which are described below. The Plan is subject to the provisions of the Employee Retirement Income Security Act (ERISA) of 1974, as amended. Participants should refer to the Plan document for more complete information.

The Plan became effective July 1, 1988, and has been amended periodically. The Plan allows participants to defer a portion of their compensation, subject to the 2010 IRS yearly limit of $16,500, on a pretax basis under the rules of Section 401(k) of the Internal Revenue Code (IRC) and also allows for contributions on an after-tax basis, subject to IRS yearly contribution limits, as discussed below.

Transfers from UPS QSOP — The UPS Qualified Stock Ownership Plan (the “QSOP”) was a voluntary defined contribution plan established for employees of UPS and certain subsidiaries of UPS who were not members of a collective bargaining unit and who satisfied the participation requirements of the QSOP. The QSOP was established to provide a matching contribution to those employees of UPS who made elective deferrals under the Plan and to invest that matching contribution entirely in UPS common stock.

Effective January 1, 2009, the QSOP was discontinued as a separate plan and the UPS Class A common stock investment was added to the Plan as a new investment option called the UPS Stock Fund. All assets of the QSOP, totaling $795.914 million were transferred to the UPS Stock Fund on January 1, 2009.

Employer Contributions — Effective January 30, 2009, UPS suspended the employer-matching contribution to the Plan. Employer contributions related to the period prior to the suspension were $8.134 million for 2009, while there were no employer contributions in 2010. UPS announced reinstatement of the employer-matching contribution to the Plan effective January 1, 2011.

Contributions and Vesting — Eligible employees may participate in the Plan immediately upon hire. The provisions of the Plan provide that a participant’s entire account is 100% vested at all times. Participants may make voluntary contributions in one of three ways: pretax, after tax, or to the Roth 401(k) feature. Limits to these contributions are as follows:

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Participants can contribute to the Plan an amount consisting of an eligible rollover distribution or transfer from a conduit individual retirement account. Rollover contributions are at all times fully vested and nonforfeitable. Participants may not roll over participant loans to Plan account balances from other qualified retirement plans, annuity contracts, or individual retirement accounts.

Investments — Participants may choose from various investment options including UPS Class A common stock, short-term investments and common and collective trust funds. Within the self-managed account, participants can purchase registered investment companies and individual securities listed on major U.S. securities exchanges. Participants should refer to the Plan document for more complete information concerning the Plan’s investment options.

Participant Accounts — Individual accounts are maintained for each plan participant. Each participant’s account is credited with the participant’s contribution and an allocation of Plan earnings and charged with withdrawals and allocations of Plan losses and administrative expenses. Allocations are based on participant earnings (losses) or account balances, as defined.

Payment of Benefits — The Plan does not permit withdrawals or distributions except in the case of hardship, at attainment of age 59 1/2, termination of employment, or upon the death or total and permanent disability of the participant. In order to qualify for a hardship withdrawal, the participant must satisfy the legal requirements of a financial hardship as defined by IRC regulations. Participants should refer to the Plan document for more complete information concerning the Plan’s benefit payment options.

Notes Receivable from Participants — The Plan provides for loans in cases of hardship or home loans only. Participants may borrow from their accounts a minimum of $1,000 up to a maximum of the lesser of $50,000 or 50% of their account balances (across all UPS-sponsored plans in which they participate). Loan terms range from one to fifteen years. Interest rates on outstanding loans ranged from 4.00% to 10.75% as of December 31, 2010. The loans are collateralized by the participant’s account and bear interest at a fixed rate equal to one percentage point above the prime rate on the last business day of the month prior to the month in which the participant makes application for the loan. Principal and interest are paid ratably through regular payroll deductions.

Plan Termination — Although it has not expressed any intent to do so, UPS has the right under the Plan to terminate the Plan subject to the provisions of ERISA. In the event of a termination, the trustee has been instructed to maintain separate Plan accounts for each participant to accumulate earnings until the final terminating distribution.

Plan Administration — ING provides recordkeeping and administrative services to the Plan. State Street Bank and Trust Company serves as the trustee for all assets of the Plan, with the exception of the UPS Stock Fund. BNY Mellon is the trustee for Class A shares of UPS Stock in the UPS Stock Fund.

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Basis of Accounting — The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP).

Use of Estimates and Risks and Uncertainties — The preparation of financial statements in conformity with GAAP requires Plan management to make estimates and assumptions that affect the reported amounts of net assets available for benefits and changes therein and disclosure of contingent assets and liabilities. Actual results could differ from those estimates. The Plan utilizes various investment instruments, including short-term investments, common and collective trust funds, registered investment companies, and certain individual securities listed on major U.S. securities exchanges. Investment securities, in general, are exposed to various risks, such as interest rate risk, credit risk, and overall market volatility. Due to the level of risk associated with certain investment securities, it is reasonably possible that changes in the values of investment securities will occur in the near term and such changes could materially affect the amounts reported in the financial statements.

Investment Valuation and Income Recognition — The Plan’s investments are 100% participant directed and stated at fair value. Fair value of a financial instrument is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Quoted market prices are used to value all readily marketable securities. The value of each share of Class A common stock held by the Plan at December 31, 2010 and 2009, is equal to the price of a share of Class B common stock as reported by the New York Stock Exchange. Shares of common and collective trust funds are reported at the net asset value of shares held by the Plan at year-end, as determined by the trustee.

In accordance with GAAP, the stable value fund was included at fair value in participant-directed investments in the statements of net assets available for benefits in 2009 with an additional line item representing the adjustment from fair value to contract value. In 2010, the Plan sold the investments within the Stable Value Fund and transferred those assets to a Short Term Government Credit Bond Index Fund. There was no fair value to contract value adjustment necessary for this fund.

Prior to the sale of these investments, the Plan offered a stable value investment option, the State Street Bank and Trust Company Stable Fixed Income Fund for Employee Benefit Trusts, to participants. The fund invested in fixed-income insurance investment contracts, corporate and government bonds, mortgage-backed securities, bond funds, and other fixed-income securities. It was the policy of the fund to use its best efforts to maintain a stable net asset value of $1 per unit, although there was no guarantee that the fund was able to maintain this value.

Participants were able to ordinarily direct the withdrawal or transfer of all or a portion of their investment at contract value. Contract value represented contributions made to the fund, plus earnings, less participant withdrawals. The stable value fund was stated at fair value and then adjusted to contract value as described above in the 2009 statements of net assets available for benefits. Fair value of the stable value fund was the net asset value of its underlying investments, and contract value was principal plus accrued interest. The fund imposed certain restrictions on the Plan, and the fund itself was subject to circumstances that could impact its ability to transact at contract value. The fund did not transact at less than contract value.

Purchases and sales of securities are recorded on a trade-date basis. Interest income is recorded on the accrual basis. Dividend income is recorded on the ex-dividend date.

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The Plan also offers a self-managed account option. Within the self-managed account, participants can purchase registered investment companies and individual securities listed on major U.S. securities exchanges. These investments are stated at fair value based upon quoted market prices.

Administrative Expenses — Administrative expenses of the Plan are paid by the Plan and UPS as provided in the Plan document. UPS provides certain accounting and other administrative services to the Plan free of charge. Management fees and operating expenses charged to the Plan for investments are deducted from income earned on a daily basis and are not separately reflected. Consequently, management fees and operating expenses are reflected as a reduction of investment return for such investments. Administrative fees for 2010 and 2009 were as follows (in thousands):

Payment of Benefits — Benefit payments to participants are recorded upon distribution.

Notes Receivable from Participants — Notes receivable from participants are measured at their unpaid principal balance plus any accrued but unpaid interest. Delinquent participant loans are recorded as distributions based on the terms of the Plan document.

Excess Contributions Payable — The Plan is required to return contributions to participants in the event certain non-discrimination tests defined under the IRC are not satisfied. For both 2010 and 2009, the Plan passed the non-discrimination tests and the Plan was therefore not required to refund contributions to any Plan participants.

New Accounting Standards

ASU No. 2010-06, Fair Value Measurements and Disclosures — In January 2010, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2010-06, Fair Value Measurements and Disclosures, which amends ASC 820, Fair Value Measurements and Disclosures, adding new disclosure requirements for Levels 1 and 2, separate disclosures of purchases, sales, issuances, and settlements relating to Level 3 measurements and clarification of existing fair value disclosures. ASU No. 2010-06 is effective for periods beginning after December 15, 2009, except for the requirement to provide Level 3 activity of purchases, sales, issuances, and settlements on a gross basis, which will be effective for fiscal years beginning after December 15, 2010. The Plan prospectively adopted the new guidance in 2010, except for the Level 3 reconciliation disclosures, which are required in 2011. The adoption in 2010 did not materially affect, and the future adoption is not expected to materially affect, the Plan’s financial statements.

ASU No. 2010-25, Reporting Loans to Participants by Defined Contribution Pension Plans — In September 2010, the FASB issued ASU No. 2010-25, Reporting Loans to Participants by Defined Contribution Pension Plans. The ASU requires that participant loans be classified as notes receivable rather than a plan investment and measured at unpaid principal balance plus accrued but unpaid interest rather than fair value. The Plan retrospectively adopted the new accounting in 2010. The adoption did not have a material effect on the Plan’s financial statements.

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ASC 820, Fair Value Measurements and Disclosures, provides a framework for measuring fair value. That framework provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value, as follows: Level 1, which refers to securities valued using unadjusted quoted prices from active markets for identical assets; Level 2, which refers to securities not traded on an active market but for which observable market inputs are readily available; and Level 3, which refers to securities valued based on significant unobservable inputs. Assets are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.

The following tables set forth by level within the fair value hierarchy a summary of the Plan’s investments measured at fair value on a recurring basis at December 31, 2010 and 2009:

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A reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3) is as follows (in thousands):

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Investments that represent 5% or more of the Plan’s net assets available for benefits as of December 31, 2010 and 2009, are as follows (in thousands):

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During 2010 and 2009, the Plan’s investments (including gains and losses on investments bought and sold, as well as held during the year) appreciated (depreciated) in value as follows (in thousands):

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The Internal Revenue Service has determined and informed UPS by a letter dated August 26, 2002, that the Plan and related trust were designed in accordance with the applicable regulations of the IRC. The Company filed a determination letter application on January 29, 2010 in line with the Determination Letter staggered cycle; however, UPS and the Plan administrator believe that the Plan is currently designed and operated in compliance with the applicable requirements of the IRC and the Plan and related trust continue to be tax-exempt. Therefore, no provision for income taxes has been included in the Plan’s financial statements.

GAAP requires Plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS. The Plan administrator has analyzed the tax positions taken by the Plan, and has concluded that as of December 31, 2010, there are no uncertain positions taken or expected to be taken that would require recognition of a liability (or asset) or disclosure in the financial statements. The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Plan administrator believes it is no longer subject to income tax examinations for years prior to 2008.

Certain Plan investments are managed by State Street Bank & Trust Company (“State Street”) or the BlackRock Institutional Trust Company (“BlackRock”). State Street and ING are the trustee and recordkeeper, respectively, as defined by the Plan, and therefore, fees paid to these institutions qualify as exempt party-in-interest transactions. Fees paid by the Plan for recordkeeping and trustee fees were $2.458 million and $2.537 million for the years ended December 31, 2010 and 2009, respectively. Fees paid by the Plan for investment management services were $1.345 million and $1.142 million for the years ended December 31, 2010 and 2009, respectively.

UPS is the Plan sponsor and all transactions in its common stock qualify as party-in-interest transactions. As of December 31, 2010 and 2009, the Plan held 13,430,839 and 14,126,820 shares of common stock of the Company with a fair value of $974.810 million and $810.456 million and a cost basis of $765.871 million and $795.514 million, respectively. During the year ended December 31, 2010, the Plan recorded dividend income on UPS common stock of $25.857 million.

A reconciliation of net assets available for benefits per the financial statements to Form 5500 as of December 31, 2010, is as follows (in thousands):

* * * * * *

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SUPPLEMENTAL SCHEDULES

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UPS SAVINGS PLAN

FORM 5500, SCHEDULE H, PART IV, LINE 4i — SCHEDULE OF ASSETS (HELD AT END OF YEAR)

AS OF DECEMBER 31, 2010

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UPS SAVINGS PLAN

FORM 5500, SCHEDULE H, PART IV, LINE 4j — SCHEDULE OF REPORTABLE TRANSACTIONS

FOR THE YEAR ENDED DECEMBER 31, 2010

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Administrative Committee, administrator of the Plan, has duly caused this annual report to be signed on its behalf by the undersigned thereunto duly authorized.

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EXHIBIT INDEX

Exhibit 23.1 — Consent of Deloitte & Touche LLP.

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