Cheapest€135.84
- Delta Air Lines DA659706:142h 44m08:58Seattle SEADenver DEN
Door to door 5h 54mCO2 415.7 kgChanges 0Fixed, no changes
Seattle to Denver flight
Flights from Seattle to Denver start at €161.21 and take 5h 42m at their fastest.
The Flights from Seattle to Denver starts at €161.21 and takes 5h 42m door to door, run by 5 operators over 1,690 km, with around 40 departures a day. Fares bottom out about 60 days before departure.
- 5h 42mDoor to door
- 2h 32mMoving
- €161.21From
- 415.7 kgCO2
The cheapest and the fastest on 29 September 2026
Two journeys we can sell today, with the service number each operator files them under.
Fastest€198.97
- United Airlines UA550514:382h 32m17:10Seattle SEADenver DEN
Door to door 5h 42mCO2 415.7 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 |
|---|---|
 Alaska Airlines | €138.20 |
 Delta Air Lines | €135.84 |
 Frontier Airlines | €140.56 |
| United Airlines | €136.43 |
 Southwest Airlines | €142.92 |
The flight gets you into Denver. It does not get you a bed, and neither do we.
Looking for somewhere to stay in Denver?
Hotels and flats near the centre, most of them with free cancellation, on a map that shows what is walkable.
Search Denver on Booking.comOr compare on Expedia
Partner links. We do not sell accommodation. We earn a commission when a booking completes, and it never changes what you pay.
When to book Seattle to Denver
The same search run across the whole booking window, so the shape of the curve is visible rather than described.
- €176.5590 days
- €103.3960 days
- €114.0145 days
- €129.3530 days
- €157.6721 days
- €168.2914 days
- €198.387 days
- €205.463 days
- €326.411 days
- Cheapest lead time
- Fares bottom out around 60 days ahead, at €103.39.
- How much it moves
- The gap between the cheapest and dearest lead time is 216 percent. The dearest point is €326.41, 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.
- €196.61Sun
- €168.29Mon
- €161.21Tue
- €180.09Wed
- €216.67Thu
- €168.29Fri
- €205.46Sat
Where you leave from and where you arrive
The stations, airports and ports each mode on this corridor actually uses.
Seattle
Air
- SEA
- BFI
Denver
Air
- DEN
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 1,690 km against 1,641 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 Seattle at 06:14 and the last at 20:53, across 40 departures. The return direction keeps its own timetable, so the times back are not these times reversed.
Questions about Seattle to Denver
The questions people actually ask about this journey, 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 Seattle to Denver take?
The Flight from Seattle to Denver takes 5h 42m door to door, of which 2h 32m is spent moving. The route runs 1,690 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 Seattle to Denver cost?
The Flight from Seattle to Denver starts at €161.21 for one passenger, checked on 29 September 2026. A typical fare is €171.24. 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 Seattle to Denver?
5 operators run the Flight from Seattle to Denver: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines. Between them they file around 40 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 Seattle to Denver use?
The Flight from Seattle to Denver leaves from Seattle SEA and arrives at Denver DEN. 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 Seattle to Denver?
Fares for the Flight from Seattle to Denver bottom out around 60 days ahead, at €103.39. The gap between the cheapest and dearest lead time across the window is 216 percent, measured on 29 September 2026. Booking inside the final week has consistently cost more.
How much CO2 does the Flight from Seattle to Denver produce?
The Flight from Seattle to Denver produces about 415.7 kg of CO2 per passenger over 1690 km, which works out at roughly 246 grams per passenger kilometre. That figure is for the whole journey and for one traveller, 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 modelled 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 Seattle to Denver on 11 September 2026: 1690 km of route against 1641 km in a straight line, 40 services a day, 5 operators, a cheapest fare of €161.21, and 5h 42m door to door on the fastest mode. The return direction is computed separately and its numbers are not these numbers.
Related journeys
Denver to Seattle flightCompare every mode from Seattle to DenverAbilene to Denver flightAkron to Denver flightAlbuquerque to Denver flightAllentown to Denver flightAmarillo to Denver flightAnchorage to Denver flightAsheville to Denver flightAtlanta to Denver flightAustin to Denver flightBakersfield to Denver flightBaltimore to Denver flightBend to Denver flight