Cheapest€224.93
- United Airlines UA462916:254h 34m20:59Chicago MDWSeattle SEA
Door to door 7h 44mCO2 706.5 kgChanges 0Fixed, no changes
Chicago to Seattle flight
Flights from Chicago to Seattle start at €268.00 and take 7h 11m at their fastest.
The Flights from Chicago to Seattle starts at €268.00 and takes 7h 11m door to door, run by 7 operators over 2,872 km, with around 56 departures a day. Fares bottom out about 60 days before departure.
- 7h 11mDoor to door
- 4h 1mMoving
- €268.00From
- 706.5 kgCO2
The cheapest and the fastest on September 29, 2026
Two journeys we can sell today, with the service number each operator files them under.
Fastest€233.78
- Korean Air KA315512:414h 1m16:42Chicago ORDSeattle BFI
Door to door 7h 11mCO2 706.5 kgChanges 0Fixed, no changes
Airlines
Speed, flexibility and what is on board. Nothing here is a rating, because we have not earned one.
| Operator | From |
|---|---|
 American Airlines | €230.83 |
 Alaska Airlines | €229.65 |
| China Airlines | €230.24 |
 Delta Air Lines | €231.42 |
 Korean Air | €233.78 |
| United Airlines | €224.93 |
 Southwest Airlines | €231.42 |
That is the traveling done. What happens after you walk out into Seattle is not something we sell.
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When to book Chicago to Seattle
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €229.0690 days
- €173.0160 days
- €211.3645 days
- €228.4730 days
- €277.4421 days
- €300.4514 days
- €361.227 days
- €394.263 days
- €512.261 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €173.01.
- How much it moves
- The gap between the cheapest and most expensive lead time is 196 percent. The most expensive point is €512.26, 1 days out.
- What that means
- Today sits inside the cheap window, which closes about 60 days before departure. Waiting from here has usually cost money on this corridor rather than saved it.
Which departure day costs least
Median cheapest fare for each weekday, taken across the next three weeks of real prices.
- €315.20Sun
- €272.72Mon
- €268.00Tue
- €289.83Wed
- €300.45Thu
- €333.49Fri
- €344.11Sat
Where you leave from and where you arrive
The stations, airports and ports each mode on this corridor actually uses.
Chicago
Air
- ORD
- MDW
Seattle
Air
- SEA
- BFI
What the journey actually looks like
Direct or connecting, how far the route really runs, and what happens when a connection is missed.
- How far it really runs
- The route covers 2,872 km against 2,789 km in a straight line, a detour of 3 percent. Track and road geometry account for the difference.
- First and last departure
- The first service of the day leaves Chicago at 06:14 and the last at 20:53, across 56 departures. The return direction keeps its own timetable, so the times back are not these times reversed.
Questions about Chicago to Seattle
The questions people actually ask about this trip, answered from the same prices and times the page above is built on rather than written once and left to go stale.
How long does the Flight from Chicago to Seattle take?
The Flight from Chicago to Seattle takes 7h 11m door to door, of which 4h 1m is spent moving. The route runs 2,872 km. The difference between the two times is reaching the terminal and leaving it at the far end, which every time on this page includes.
How much does the Flight from Chicago to Seattle cost?
The Flight from Chicago to Seattle starts at €268.00 for one passenger, checked on September 29, 2026. A typical fare is €284.82. Both are the total including taxes, supplier fees and our service fee, so the price here is the price at checkout.
Who runs the Flight from Chicago to Seattle?
7 operators run the Flight from Chicago to Seattle: American Airlines, Alaska Airlines, China Airlines, Delta Air Lines, Korean Air. Between them they file around 56 departures a day. The operator table on this page compares them on fare, journey time, cruising speed, fare conditions and what is provided on board.
Which terminal does the Flight from Chicago to Seattle use?
The Flight from Chicago to Seattle leaves from Chicago ORD and arrives at Seattle BFI. Allow about 3h 10m for reaching the departure terminal and leaving the arrival one. That time is already inside every door to door figure quoted on this page.
When should I book the Flight from Chicago to Seattle?
Fares for the Flight from Chicago to Seattle bottom out around 60 days ahead, at €173.01. The gap between the cheapest and most expensive lead time across the window is 196 percent, measured on September 29, 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from Chicago to Seattle produce?
The Flight from Chicago to Seattle produces about 706.5 kg of CO2 per passenger over 2872 km, which works out at roughly 246 grams per passenger kilometer. That figure is for the whole journey and for one traveler, not for the vehicle.
Where these numbers come from
Observed service A carrier record shows this named operator serving this named pair, and we carry that through unchanged.
Schedules, seat counts and fares are generated by our own model until the supplier contracts are signed. Places, coordinates, operators, which operator serves which pair, and every distance are real. We would rather say that on every page than let a modeled number pass for a filed one.
Defined in full at Door to door, Fares, The booking window, Carbon
- On this page
- Every figure above was computed for Chicago to Seattle on September 10, 2026: 2872 km of route against 2789 km in a straight line, 56 services a day, 7 operators, a cheapest fare of €268.00, and 7h 11m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
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