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Retirement Plans and Employee Stock Purchase Plans - Retirement Plans (Details) - SkyWest Plan - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Retirement Plans |  |  |
Required age for an employee to be eligible to participate in plan | 18 years |  |
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 | $ 31.9 | $ 40.7 | $ 35.6

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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 age required to be completed by the employee to be eligible to participate in the plan. + 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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- Definition Represents the minimum 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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