Commitments and Contingencies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) employee aircraft	Dec. 31, 2024 USD ($)	Dec. 31, 2023
Concentration Risk and Significant Customers
Accrued workers' compensation liability | $	$ 19.1	$ 18.5
Accrued workers' compensation liability, current | $	$ 9.8	$ 9.0
Lease term	5 years
Minimum
Concentration Risk and Significant Customers
Financing obligation | $	$ 20.0
Maximum
Concentration Risk and Significant Customers
Financing obligation | $	$ 25.0
E175
Concentration Risk and Significant Customers
Number of aircraft under purchase agreement	69
Number of additional aircraft with secured delivery positions	44
E170
Concentration Risk and Significant Customers
Number of used aircraft acquired	2
United | E175
Concentration Risk and Significant Customers
Number of aircraft under purchase agreement	8
Alaska | E175
Concentration Risk and Significant Customers
Number of aircraft under purchase agreement	1
Delta | E175
Concentration Risk and Significant Customers
Number of aircraft under purchase agreement	16
Revenue from rights, concentration risk | Customer Concentration Risk | Delta, United, and Continental Combined
Concentration Risk and Significant Customers
Concentration risk (as a percent)	70.30%	72.30%	70.90%
Full-time equivalent number of employees | Labor Force Concentration Risk
Concentration Risk and Significant Customers
Number of employees | employee	15,800
SkyWest Airlines | Full-time equivalent number of employees | Unionized employees
Concentration Risk and Significant Customers
Approximate number of active employees | employee	0