Your next trip, last seen at €108
Lowest observedWhen to fly
Explore datesMore dates worth a look
Find the dates that work for you
The lowest fare we observed for each month. Open a month to see its days, then pick your outbound and return. A day with no price is one we will search for you.
One-way fare
- Lowest observed
- €108, departing 13 Dec 2026 (Last checked: 28 Oct 2026)One-way fare · Priced departure days checked in the last 14 days: 17Check live prices for this route
- Airlines seen
- American Airlines, Alaska Airlines, United Airlines, Southwest Airlines, Allegiant Air, Delta Air Lines, Frontier Airlines (7)
- Reported fastest flight
- 4h 42m
- Non-stop
- Yes
About this route
Explore the fares we observed from Chicago to Seattle. Prices move often, so pick your dates to see the latest options.
- Route distance
- 2,789 km
- Reported fastest flight
- 4h 42m
- Alternative airports
- CGX, DPA, MDW, PWK, RFD, BFI
Route-level information; individual journeys vary.
Published schedules report non-stop service with American Airlines, Alaska Airlines, United Airlines, Southwest Airlines. Check current timetables.
A clearer picture of your fare
Non-stop airlines seen on this route
| Airline | Non-stop days / priced days | Fastest non-stop |
|---|---|---|
| Alaska Airlines | 30 / 67 | |
| United Airlines | 10 / 67 |
Departure days with a non-stop fare checked in the last 14 days. A carrier listed here had a non-stop fare on at least 3 days; schedules may differ.
Airport to city: straight-line distance
- Chicago Midway International Airport (MDW) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 14 km.
- Chicago O'Hare International Airport (ORD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 25 km.
- Chicago Rockford International Airport (RFD) → Chicago, city gazetteer reference point (41.8781, -87.6298): ≈ 126 km.
- King County International Airport - Boeing Field (BFI) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 9 km.
- Seattle–Tacoma International Airport (SEA) → Seattle, city gazetteer reference point (47.6062, -122.3321): ≈ 18 km.
Approximate distances calculated from coordinates, not road distances or travel times. These airports serve the city; they are not confirmed endpoints of an offer.
Lowest fare by departure month
Cheapest month from Chicago to Seattle: December 2026, from €108 (checked 28 Oct 2026).
| Month | Lowest fare | Priced days |
|---|---|---|
| November 2026 | €151 | 4 |
| December 2026 | €108 | 12 |
Lowest fare by day of the week
Cheapest day of the week from Chicago to Seattle: Sunday, from €108 (checked 28 Oct 2026).
| Day | Lowest fare | Priced days |
|---|---|---|
| Monday | €127 | 3 |
| Saturday | €113 | 3 |
| Sunday | €108 | 3 |
One-way fares checked in the last 14 days. Each figure is the lowest priced departure day we saw, not a guaranteed fare.
Lowest fare by days before departure
Lowest fare from Chicago to Seattle by days until departure (31 to 60 days): €108 (checked 28 Oct 2026).
| Days before departure | Lowest fare | Priced days |
|---|---|---|
| 8 to 30 days | €151 | 4 |
| 31 to 60 days | €108 | 12 |
One-way fares checked in the last 14 days. Each figure is the lowest stored fare for that distance to departure, not a price forecast.
Fares for different departure dates, checked now; not a guide to when to book.
Lowest one-way fare we saw per airline
Cheapest airline from Chicago to Seattle: Frontier Airlines, from €115 (checked 17 Oct 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €115Dec 3, 2026 | 21 |
| Alaska Airlines | €135Jan 4, 2027 | 30 |
| United Airlines | €137Dec 12, 2026 | 10 |
One-way fares checked in the last 14 days. An airline listed here had a fare on at least 3 departure days. Each figure is the lowest we saw, not a guaranteed fare. Connecting itineraries are included; the date is the departure day of that fare.
Frequently asked
How much is a flight from Chicago to Seattle?
The lowest fare Routavio has observed is €108, found on 28 Oct 2026. Prices move, so read it as a floor rather than a quote.
When is the cheapest month to fly from Chicago to Seattle?
Cheapest month from Chicago to Seattle: December 2026, from €108 (checked 28 Oct 2026).
Are there direct flights from Chicago to Seattle?
Yes. Published schedules report non-stop flights on this route with American Airlines, Alaska Airlines, United Airlines, Southwest Airlines.
Which airlines fly from Chicago to Seattle?
Routavio has seen these carriers on the route: American Airlines, Alaska Airlines, United Airlines, Southwest Airlines, Allegiant Air, Delta Air Lines, Frontier Airlines (7).
How long does the flight from Chicago to Seattle take?
Across the 50 fares Routavio observed, the average journey time is 8h 13m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed Chicago to Seattle fares were non-stop?
46 of the 73 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
Which airlines had non-stop offers on at least 3 departure dates from Chicago to Seattle?
For Chicago to Seattle, examples of observed one-way non-stop offers checked within the last 14 days: Alaska Airlines (30), United Airlines (10). Each number counts distinct departure dates, not weekly flights; check current availability in search.
Which day of the week is cheapest from Chicago to Seattle?
Cheapest day of the week from Chicago to Seattle: Sunday, from €108 (checked 28 Oct 2026).
Which airline has the lowest fare from Chicago to Seattle?
Cheapest airline from Chicago to Seattle: Frontier Airlines, from €115 (checked 17 Oct 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide
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Recently observed fares. Prices may change.
Last checked: 28 Oct 2026