ULCC · Frontier Group Holdings, Inc. · Insider Trading

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 3, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.05 to $8.15, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $8.00 to $8.20, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $7.55 to $7.56, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Each Deferred Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Deferred Stock Units have no expiration date.

The Deferred Stock Units will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date and will be settled in shares of the Issuer's Common Stock either (i) on a date selected by the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Program (the "Plan"), or (ii) as otherwise provided by the Plan.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.00 to $6.02, inclusive. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

The price reported in Column 4 is a weighted average price. The Reporting Person undertakes to provide to Frontier Group Holdings, Inc., any security holder of Frontier Group Holdings, Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Deferred Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Deferred Stock Units have no expiration date.

The Deferred Stock Units will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date and will be settled in shares of the Issuer's Common Stock either (i) on a date selected by the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Program (the "Plan"), or (ii) as otherwise provided by the Plan.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Deferred Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Deferred Stock Units have no expiration date.

The Deferred Stock Units will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date and will be settled in shares of the Issuer's Common Stock either (i) on a date selected by the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Program (the "Plan"), or (ii) as otherwise provided by the Plan.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Deferred Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Deferred Stock Units have no expiration date.

The Deferred Stock Units will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date and will be settled in shares of the Issuer's Common Stock either (i) on a date selected by the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Program (the "Plan"), or (ii) as otherwise provided by the Plan.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Each Deferred Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Deferred Stock Units have no expiration date.

The Deferred Stock Units will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date and will be settled in shares of the Issuer's Common Stock either (i) on a date selected by the Reporting Person pursuant to the Issuer's Non-Employee Director Compensation Program (the "Plan"), or (ii) as otherwise provided by the Plan.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs will vest in full on the earlier of May 14, 2027 or immediately prior to the next annual meeting of stockholders after the grant date, subject to continued service of the Reporting Person through the vesting date.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The RSUs have fully vested as of May 14, 2026.

Represents shares of Issuer Common Stock withheld by the Issuer solely to satisfy tax withholding obligations in connection with the net issuance of shares of Issuer Common Stock delivered to the Reporting Person on March 25, 2026, from the vesting of Restricted Stock Units, and does not represent a sale by the Reporting Person.

Each Restricted Stock Unit represents a contingent right to receive one share of Issuer Common Stock. The Restricted Stock Units have no expiration date.

The remaining Restricted Stock Units vest in two substantially equal annual installments beginning on March 25, 2027.