Summary of Significant Accounting Policies (Policies) |
6 Months Ended |
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Jun. 30, 2026 | |
| Accounting Policies [Abstract] | |
| Basis of Presentation | The condensed consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”) |
| Consolidation | The condensed consolidated financial statements have been prepared in accordance with the generally accepted accounting principles in the United States (“GAAP”) and include the accounts of Frontier Group Holdings, Inc. (“FGHI” or the “Company”) and its wholly-owned direct and indirect subsidiaries, including Frontier Airlines Holdings, Inc. (“FAH”) and Frontier Airlines, Inc. (“Frontier”). All wholly-owned subsidiaries are consolidated, with all intercompany transactions and balances being eliminated.
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| Use of Estimates | The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts in the financial statements and accompanying notes. Actual results could differ from those estimates.
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| Fair Value Measurement | Cash, Cash Equivalents and Restricted Cash Cash, cash equivalents and restricted cash are comprised of liquid money market funds, time deposits, and cash, and are categorized as Level 1 instruments. The Company maintains cash with various high-quality financial institutions. Cash, cash equivalents and restricted cash are carried at cost, which management believes approximates fair value. As of June 30, 2026 and December 31, 2025, the Company had $19 million and $17 million, respectively, of restricted cash as a component of cash and cash equivalents on the Company’s condensed consolidated balance sheets. Debt The estimated fair value of the Company’s debt agreements has been determined to be a Level 3 measurement, as certain inputs used to determine the fair value of these agreements are unobservable. The Company utilizes a discounted cash flow method to estimate the fair value of the Level 3 debt.
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