Flights Chicago → Seattle

One way · Economy · 1 adult · price per person · next 14 days from September 10, 2026

Last observed price on Aviasales for 7 of 15 dates; the lowest is $143. Prices are not guaranteed and are confirmed at booking time.

Last observed price by date

Date	Last observed price	Flight	Departure	Arrival	Stops
Thu, Sep 10	—	—	—	—	—
Fri, Sep 11	—	—	—	—	—
Sat, Sep 12	$143lowest	Alaska Airlines AS337	7:00 PM O'Hare (ORD)	9:38 PM Sea-Tac (SEA)	Direct
Sun, Sep 13	—	—	—	—	—
Mon, Sep 14	—	—	—	—	—
Tue, Sep 15	$176	Frontier Airlines F93647 (1st of 2 flights)	1:21 PM O'Hare (ORD)	9:42 AM (+1) Sea-Tac (SEA)	1 stop · Las Vegas Harry Reid
Wed, Sep 16	$150	United Airlines UA1974 (1st of 2 flights)	5:51 PM O'Hare (ORD)	11:04 PM Sea-Tac (SEA)	1 stop · Denver International
Thu, Sep 17	$174	Frontier Airlines F91483 (1st of 2 flights)	6:30 AM O'Hare (ORD)	3:08 PM Sea-Tac (SEA)	1 stop · Denver International
Fri, Sep 18	$175	Frontier Airlines F92145 (1st of 2 flights)	8:55 PM O'Hare (ORD)	9:42 AM (+1) Sea-Tac (SEA)	1 stop · Las Vegas Harry Reid
Sat, Sep 19	$174	Frontier Airlines F91483 (1st of 2 flights)	6:30 AM O'Hare (ORD)	3:08 PM Sea-Tac (SEA)	1 stop · Denver International
Sun, Sep 20	—	—	—	—	—
Mon, Sep 21	—	—	—	—	—
Tue, Sep 22	—	—	—	—	—
Wed, Sep 23	$177	Frontier Airlines F91483 (1st of 2 flights)	6:30 AM O'Hare (ORD)	3:08 PM Sea-Tac (SEA)	1 stop · Denver International
Thu, Sep 24	—	—	—	—	—

Price not guaranteed: it is confirmed on Aviasales at booking time. How it works

Chicago, United States (CHI, city code)

Chicago O'Hare (ORD), Chicago Midway (MDW).

Seattle, United States (SEA, city code)

Seattle-Tacoma (SEA).

FromToDeparture date