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Retirement Plans and Employee Stock Purchase Plans - Retirement Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Retirement Plans |  |  |
Minimum benefit plan percentage of participants compensation eligible for employer matching contribution based on position and years of service | 0.00% |  |
Maximum benefit plan percentage of participants compensation eligible for employer matching contribution based on position and years of service | 20.00% |  |
SkyWest Plan |  |  |
Retirement Plans |  |  |
Percentage of employer matching contribution based on length of service | 100.00% |  |
Minimum benefit plan percentage of participants compensation eligible for employer matching contribution based on position and years of service | 2.00% |  |
Maximum benefit plan percentage of participants compensation eligible for employer matching contribution based on position and years of service | 12.00% |  |
Company's combined contributions | $ 59.3 | $ 45.4 | $ 42.1

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- Definition Represents the maximum percentage of the employer's matching contribution for participant contributions based upon the length of service. + References No definition available. + Details
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- Definition Represents the maximum benefit plan percentage of participants compensation eligible for employer matching contribution based on position and years of service. + References No definition available. + Details
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