v3.26.1
Fair Value Measurements (Details) - SKYWEST, INC. EMPLOYEES' RETIREMENT PLAN - USD ($)
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value Measurements    
Investments, at fair value $ 1,654,305,000 $ 1,398,411,000
Stable value fund    
Fair Value Measurements    
Redemption notice period 12 months  
Unfunded commitments $ 0  
Common stock fund    
Fair Value Measurements    
Unfunded commitments $ 0  
Number of shares held by the Plan 469,246 439,091
Common Stock Fund (Common stock)    
Fair Value Measurements    
Investments, at fair value $ 47,116,991 $ 43,966,182
Common Stock Fund (Cash equivalents)    
Fair Value Measurements    
Investments, at fair value $ 1,494,515 $ 1,338,537