AirSource

Flights Chicago → Seattle — September 18, 2026

One way · Economy · 1 adult · price per person

The cheapest itinerary observed for Friday, September 18, 2026 on the Chicago–Seattle route: 1 stop itinerary (2 flights) via Las Vegas Harry Reid (LAS), from Chicago O'Hare (ORD) to Seattle-Tacoma (SEA), first flight Frontier Airlines F92145, departs 8:55 PM, arrives 9:42 AM the next day, total travel time 14h 47m including layovers, flight time 7h 2m (layovers excluded), $175 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 9, 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: American Airlines AA3105, from Chicago O'Hare (ORD) to Seattle-Tacoma (SEA), departs 7:17 AM, arrives 10:09 AM, direct, 4h 52m, $227 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 Las Vegas Harry Reid (LAS) · first flight Frontier Airlines F92145

1 stop
Fri, Sep 18
Chicago O'Hare (ORD)
14h 47m
1 stop
+1
Sat, Sep 19
Seattle-Tacoma (SEA)
First flight
Frontier Airlines F92145 (1st of 2 flights)
Connecting flights
Operated after the layover in Las Vegas Harry Reid (LAS); airline and flight number are not provided by Aviasales in this record: see them on the booking site.
Departure
Chicago O'Hare (ORD) · September 18, 2026 · local time (UTC-5)
Final arrival
Seattle-Tacoma (SEA) · September 19, 2026 · local time (UTC-7) · next day
Stops
1 stop · in Las Vegas Harry Reid (LAS)
Total travel time
14h 47m (layovers included)
Flight time
7h 2m (layovers excluded)
Layover time
7h 45m
Carry-on bag
not included (personal item only)
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$175 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on
Last observed price
$175
per person, one way
Check the current price and book

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

Cheapest direct flight observed

American Airlines AA3105

Direct · Chicago O'Hare (ORD) → Seattle-Tacoma (SEA)

Direct
Fri, Sep 18
Chicago O'Hare (ORD)
4h 52m
direct
Fri, Sep 18
Seattle-Tacoma (SEA)
Airline
American Airlines (AA)
Flight
AA3105
Departure
Chicago O'Hare (ORD) · September 18, 2026 · local time (UTC-5)
Arrival
Seattle-Tacoma (SEA) · September 18, 2026 · local time (UTC-7)
Stops
Direct (no plane change, as stated by the source; it can include a stop)
Duration
4h 52m
Carry-on bag
included
Checked bag
not included
Changes
not allowed
Refund
non-refundable
Last observed price
$227 per person, one way
Observed
Price and fare conditions found in an Aviasales search on · read by AirSource on
Last observed price
$227
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 ChicagoSeattle flights on September 18, 2026 on Aviasales.

Nearby dates