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Flying Agreement and Airport Customer Service and Other Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) aircraft item	Mar. 31, 2017 USD ($)
Agreements with other airlines
Percentage of ASMs flown under fixed-fee arrangements	85.70%
Percentage of ASMs flown under pro-rate arrangements	14.30%
Revenues [Abstract]
Operating revenues | $	$ 783,400	$ 747,166	[1]
Sky West Airlines Inc | Delta Connection Prorate Agreement
Revenues [Abstract]
Term of agreement	30 days
Sky West Airlines Inc | United Express Prorate Agreement
Revenues [Abstract]
Term of agreement	120 days
Sky West Airlines Inc | American Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	7
Sky West Airlines Inc | American Prorate Agreement
Revenues [Abstract]
Term of agreement	120 days
CRJ 200 | Sky West Airlines Inc | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	60
CRJ 200 | Sky West Airlines Inc | Delta Connection Prorate Agreement
Revenues [Abstract]
Number of aircraft	34
CRJ 200 | Sky West Airlines Inc | United Express Agreements
Revenues [Abstract]
Number of aircraft	65
CRJ 200 | Sky West Airlines Inc | United Express Prorate Agreement
Revenues [Abstract]
Number of aircraft	20
CRJ 200 | Sky West Airlines Inc | American Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	10
CRJ 200 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	3
CRJ 700 | Sky West Airlines Inc | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	27
CRJ 700 | Sky West Airlines Inc | United Express Agreements
Revenues [Abstract]
Number of aircraft	20
CRJ 700 | Sky West Airlines Inc | American Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	37
CRJ 700 | ExpressJet | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	31
CRJ 700 | ExpressJet | American Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	12
CRJ 900 | Sky West Airlines Inc | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	36
CRJ 900 | ExpressJet | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	6
E 175
Revenues [Abstract]
Number of seats on aircraft | item	76
E 175 | Sky West Airlines Inc | Delta Connection Agreements
Revenues [Abstract]
Number of aircraft	22
E 175 | Sky West Airlines Inc | United Express Agreements
Revenues [Abstract]
Number of aircraft	65
E 175 | Sky West Airlines Inc | Alaska Capacity Purchase Agreement
Revenues [Abstract]
Number of aircraft	25
E 175 | Alaska
Revenues [Abstract]
Number of additional aircraft placed into service	10
Number of additional aircraft placed into service, deferred	3
E 175 | Delta
Revenues [Abstract]
Number of additional aircraft placed into service	27
E175 SC
Revenues [Abstract]
Number of seats on aircraft | item	70
ERJ 145 | ExpressJet | United Express Agreements
Revenues [Abstract]
Number of aircraft	97
ERJ 135 | ExpressJet | United Express Agreements
Revenues [Abstract]
Number of aircraft	3
Flying agreements
Revenues [Abstract]
Operating revenues | $	$ 767,964	734,529	[1]
Flight operations
Revenues [Abstract]
Operating revenues | $	469,025	445,719
Aircraft rentals
Revenues [Abstract]
Operating revenues | $	189,068	198,463
Prorate agreements
Revenues [Abstract]
Operating revenues | $	$ 109,871	$ 90,347
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.

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