Frontier Group Holdings, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Check the appropriate box:

FRONTIER GROUP HOLDINGS, INC.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

TABLE OFCONT ENTS

Frontier Group Holdings, Inc.4545 Airport WayDenver, CO 80239

NOTICE OF ANNUAL MEETING OF STOCKHOLDERS

To be Held on May 14, 2026

To Our Stockholders:

The 2026 annual meeting of stockholders (the “Annual Meeting”) of Frontier Group Holdings, Inc., a Delaware corporation (the “Company”), will be held virtually on May 14, 2026, at 9:30 a.m. Mountain Daylight Time. You will be able to attend the Annual Meeting online and submit your questions during the Annual Meeting by visiting www.virtualshareholdermeeting.com/ULCC2026 and entering the 16-digit control number included on the Notice of Internet Availability of Proxy Materials (the “Internet Notice”) or any proxy card that you received, or on the materials provided by your bank or broker. You will also be able to submit questions in advance of the Annual Meeting by visiting www.proxyvote.com. The Annual Meeting will be held for the following purposes:

(1)To elect Andrew S. Broderick, Bernard L. Han, Anthony D. Salcido, and Alejandro D. Wolff, as Class II directors to serve until the 2029 annual meeting of stockholders, and until their respective successors are duly elected and qualified;

(2)To ratify the appointment of Ernst & Young LLP as our independent registered public accounting firm for the fiscal year ending December 31, 2026; and

(3)To approve, on an advisory (non-binding) basis, the compensation of our named executive officers.

The stockholders will also act on any other business that may properly come before the Annual Meeting or any postponement, continuation, or adjournment thereof.

While all of the Company’s stockholders are invited to attend the virtual Annual Meeting, only holders of record of our outstanding shares of common stock at the close of business on March 27, 2026 are entitled to notice of and to vote at the Annual Meeting, or any continuation, postponement, or adjournment of the Annual Meeting. A complete list of these stockholders will be available for examination by any stockholder during the ten days prior to the Annual Meeting for a purpose germane to the Annual Meeting by sending an email to IR@flyfrontier.com, stating the purpose of the request, and providing proof of ownership of the Company’s common stock. The Annual Meeting may be continued or adjourned from time to time without notice other than by announcement at the Annual Meeting.

Important Information for Holders of Common Stock

It is important that your shares be represented regardless of the number of shares you may hold as of the record date. Whether or not you plan to attend the virtual Annual Meeting, we urge you to vote your shares via the toll-free telephone number or over the Internet, as described in the enclosed materials. If you received a copy of the proxy card by mail, you may sign, date, and mail the proxy card in the enclosed return envelope, which is addressed for your convenience and needs no postage if mailed in the United States. Promptly voting your shares will ensure the presence of a quorum at the Annual Meeting and will save us the expense of further solicitation. Submitting your proxy now will not prevent you from voting your shares at the Annual Meeting if you desire to do so, as your proxy is revocable at your option. The Company asks your cooperation in promptly submitting your proxy.

YOUR VOTE IS IMPORTANT

If you would like to attend the virtual Annual Meeting, please refer to the logistical information in the section titled “Questions and Answers About the 2026 Annual Meeting of Stockholders.”

By Order of the Board of Directors,

Howard Diamond

Executive Vice President, Legal and Corporate Affairs

April 2, 2026