UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): September 29, 2017

UNITED CONTINENTAL HOLDINGS, INC. UNITED AIRLINES, INC.

(Exact name of registrant as specified in its charter)

233 S. Wacker Drive, Chicago, IL 60606

233 S. Wacker Drive, Chicago, IL 60606

(Address of principal executive offices)    (Zip Code)

(872) 825-4000

(872) 825-4000

(Registrant’s telephone number, including area code)

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

Indicate by check mark whether the registrant is an emerging growth company as defined in as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company    ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐

On September 29, 2017, United Continental Holdings, Inc. (“UAL”) issued in a public offering $400,000,000 principal amount of its 4.25% Senior Notes due 2022 (the “Notes”), which are guaranteed (the “Guarantee”) by UAL’s wholly-owned subsidiary United Airlines, Inc. (“United”). The Notes and Guarantee were issued pursuant to an Indenture, dated as of May 7, 2013 (the “Indenture”), among UAL, United and The Bank of New York Mellon Trust Company, N.A., as trustee (the “Trustee”), as modified and supplemented for purposes of establishing the terms of the Notes by the Fourth Supplemental Indenture, dated as of September 29, 2017 (the “Fourth Supplemental Indenture”), among UAL, United and the Trustee.

The Notes will mature on October 1, 2022. The Notes bear interest at a rate of 4.25% per annum, payable semi-annually on April 1 and October 1 of each year, beginning April 1, 2018. The indebtedness evidenced by the Notes may be accelerated upon the occurrence of events of default under the Indenture, as supplemented by the Fourth Supplemental Indenture, which are customary for securities of this nature. UAL, at its option, may redeem some or all of the Notes at any time at a redemption price equal to the greater of (1) 100% of the principal amount of the Notes being redeemed and (2) a make-whole amount based on the sum of the present values of the remaining scheduled payments of principal and interest on the Notes discounted to the redemption date using a rate based on comparable U.S. Treasury securities plus 50 basis points, plus in either case accrued and unpaid interest to the redemption date.

The Fourth Supplemental Indenture is filed herewith as Exhibit 4.2, and is incorporated by reference herein. The form of the Notes and the form of the Notation of Note Guarantee are filed herewith as Exhibits 4.3 and 4.4, respectively, and are incorporated by reference herein. The foregoing descriptions of the Fourth Supplemental Indenture, the Notes and the Guarantee are qualified in their entirety by reference to such exhibits.

The issuance of the Notes and the Guarantee were registered pursuant to UAL’s and United’s automatic shelf registration statement on Form S-3 (Registration Nos. 333-203630 and 333-203630-1), filed with the Securities and Exchange Commission on April 24, 2015. The material terms of the Notes and the Guarantee are more fully described in the final Prospectus Supplement, dated September 27, 2017, to the Prospectus, dated April 24, 2015, of UAL and United filed with the Securities and Exchange Commission on September 29, 2017 pursuant to Rule 424(b) under the Securities Act of 1933, as amended, which description is hereby incorporated herein by reference.

The information described under Item 1.01 above “Entry into a Material Definitive Agreement” is hereby incorporated herein by reference.

EXHIBIT INDEX

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: September 29, 2017