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Defined Contribution 401(k) Plan	12 Months Ended
Defined Contribution 401(k) Plan	Dec. 31, 2023
Retirement Benefits [Abstract]
Defined Contribution 401(k) Plan	Defined Contribution 401(k) Plan The Company sponsors three defined contribution 401(k) plans, Spirit Airlines, Inc. Employee Retirement Savings Plan (first plan), Spirit Airlines, Inc. Pilots’ Retirement Savings Plan (second plan) and Spirit Airlines, Inc. Puerto Rico Retirement Savings Plan (third plan). The first plan is for all employees that are not covered by the pilots’ collective bargaining agreement, who have at least 60 days of service and have attained the age of 21. The second plan is for the Company’s pilots, and contains the same service requirements as the first plan. Beginning on March 1, 2018, the Company contributed 11% of the individual pilot's annual compensation, regardless of the pilot's contributions to the plan. The Company's contribution increased by 1% on an annual basis each March until 2022, at which time the contribution was 15%. Beginning on January 1, 2024, the Company's contribution increased to 16%. Employer contributions made to all plans were $112.4 million, $88.9 million and $72.3 million in 2023, 2022 and 2021, respectively, and were included within salaries, wages and benefits in the accompanying consolidated statements of operations.