AirSource

Flights Chicago → Seattle — September 16, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Wednesday, September 16, 2026 on the Chicago–Seattle route: 1 stop itinerary (2 flights) via Denver International (DEN), from Chicago O'Hare (ORD) to Seattle-Tacoma (SEA), first flight United Airlines UA1974, departs 5:51 PM, arrives 11:04 PM, total travel time 7h 13m including layovers, flight time 5h 55m (layovers excluded), $150 per person. Fare as listed by Aviasales: carry-on bag not included (personal item only), checked bag not included, changes not allowed, non-refundable. Price found in an Aviasales search on September 10, 2026 and read by AirSource on September 10, 2026, 21:20 UTC: it is not guaranteed and is confirmed on Aviasales at booking time. The cheapest direct flight observed: Southwest Airlines WN2825, from Chicago Midway (MDW) to Seattle-Tacoma (SEA), departs 10:35 AM, arrives 1:05 PM, direct, 4h 30m, $165 per person. Fare as listed by Aviasales: carry-on bag included, checked bag not included, changes not allowed, non-refundable.

Lowest price observed in the available data

1-stop itinerary (2 flights)

via Denver International (DEN) · first flight United Airlines UA1974

1 stop
Wed, Sep 16
Chicago O'Hare (ORD)
7h 13m
1 stop
Wed, Sep 16
Seattle-Tacoma (SEA)
First flight
United Airlines UA1974 (1st of 2 flights)
Connecting flights
Operated after the layover in Denver International (DEN); airline and flight number are not provided by Aviasales in this record: see them on the booking site.
Departure
Chicago O'Hare (ORD) · September 16, 2026 · local time (UTC-5)
Final arrival
Seattle-Tacoma (SEA) · September 16, 2026 · local time (UTC-7)
Stops
1 stop · in Denver International (DEN)
Total travel time
7h 13m (layovers included)
Flight time
5h 55m (layovers excluded)
Layover time
1h 18m
Carry-on bag
not included (personal item only)
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$150 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on
Last observed price
$150
per person, one way
Check the current price and book

Affiliate link. Booking, payment and support are handled by the seller you choose on Aviasales.

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

Cheapest direct flight observed

Southwest Airlines WN2825

Direct · Chicago Midway (MDW) → Seattle-Tacoma (SEA)

Direct
Wed, Sep 16
Chicago Midway (MDW)
4h 30m
direct
Wed, Sep 16
Seattle-Tacoma (SEA)
Airline
Southwest Airlines (WN)
Flight
WN2825
Departure
Chicago Midway (MDW) · September 16, 2026 · local time (UTC-5)
Arrival
Seattle-Tacoma (SEA) · September 16, 2026 · local time (UTC-7)
Stops
Direct (no plane change, as stated by the source; it can include a stop)
Duration
4h 30m
Carry-on bag
included
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$165 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on
Last observed price
$165
per person, one way
Check the current price and book

Affiliate link. Booking, payment and support are handled by the seller you choose on Aviasales.

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

Looking for other times? All Chicago–Seattle flights on September 16, 2026 on Aviasales.

Nearby dates