Seattle to Denver flights
Routavio compares airline fares from several flight booking sites. The lowest one-way fare it found for Seattle to Denver is €72 with Frontier Airlines (checked on 5 Nov 2026).
Your next trip, last seen at €72
Frontier Airlines · Non-stop · One wayWhen to fly
Explore datesMore dates worth a look
Last seen for 1 traveller on 12 Nov 2026. Check today's price.
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
- €72, departing 5 Dec 2026 (Last checked: 5 Nov 2026)One-way fareCheck live prices for this route
- Round trip
- €213, departing 2 Jan 2027, back 4 Jan 2027 (Last checked: 12 Nov 2026)
- Non-stop, one way
- €72, departing 5 Dec 2026 (Last checked: 6 Nov 2026)
- Airlines seen
- Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines
- Fastest observed flight time
- 2h 30m
- Non-stop
- Yes
About this route
Explore the fares we observed from Seattle to Denver. Prices move often, so pick your dates to see the latest options.
- Route distance
- 1,641 km
- Fastest observed flight time
- 2h 30m
- Airlines seen
- Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines
- Alternative airports
- BFI, APA
Route-level information; individual journeys vary.
A clearer picture of your fare
If the observed fare for this date drops, we will email you. At most one message a day.
Non-stop airlines seen on this route
| Airline | Non-stop days / priced days |
|---|---|
| Frontier Airlines | 53 / 77 |
| Alaska Airlines | 19 / 77 |
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
- 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.
- Denver International Airport (DEN) → Denver, city gazetteer reference point (39.7392, -104.9847): ≈ 30 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.
Observed fares by departure date
| Departure | Fare | Seen on |
|---|---|---|
| €161 | 5 Nov 2026 | |
| €109 | 5 Nov 2026 | |
| €98 | 5 Nov 2026 | |
| €109 | 5 Nov 2026 | |
| €81 | 5 Nov 2026 | |
| €72 | 5 Nov 2026 | |
| €88 | 5 Nov 2026 | |
| €118 | 5 Nov 2026 | |
| €78 | 5 Nov 2026 | |
| €117 | 5 Nov 2026 | |
| €88 | 5 Nov 2026 | |
| €78 | 5 Nov 2026 | |
| €114 | 5 Nov 2026 | |
| €81 | 5 Nov 2026 | |
| €118 | 5 Nov 2026 | |
| €72 | 5 Nov 2026 | |
| €108 | 5 Nov 2026 | |
| €119 | 5 Nov 2026 | |
| €125 | 5 Nov 2026 | |
| €120 | 5 Nov 2026 |
One-way fares. Each row is one price we saw for that departure day on the date shown, not a guaranteed fare.
Lowest one-way fare we saw per airline
Cheapest airline from Seattle to Denver: Frontier Airlines, €72 (checked 6 Nov 2026).
| Airline | Lowest fare | Priced days |
|---|---|---|
| Frontier Airlines | €72Dec 5, 2026 | 58 |
| Alaska Airlines | €114Feb 23, 2027 | 19 |
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 Seattle to Denver?
The lowest fare Routavio has observed is €72, found on 5 Nov 2026.
Are there direct flights from Seattle to Denver?
Yes. Published schedules report non-stop flights on this route with Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
Which airlines fly from Seattle to Denver?
Routavio has seen these carriers on the route: Alaska Airlines, Delta Air Lines, Frontier Airlines, United Airlines, Southwest Airlines.
How long does the flight from Seattle to Denver take?
Across the 77 fares Routavio observed, the average journey time is 3h 17m, including any stops. Individual departures vary; the fastest observed flight is listed in the route facts above.
How many of the observed Seattle to Denver fares were non-stop?
73 of the 79 fares we observed were non-stop; the rest included at least one stop. That describes our observations, not every flight that operates.
How much is a round trip from Seattle to Denver?
Cheapest round trip: €213, departing 2 Jan 2027, back 4 Jan 2027 (checked 12 Nov 2026).
How much is a non-stop flight from Seattle to Denver?
Cheapest non-stop one-way fare: €72, departing 5 Dec 2026 (checked 6 Nov 2026).
Which airlines had non-stop offers on at least 3 departure dates from Seattle to Denver?
For Seattle to Denver, examples of observed one-way non-stop offers checked within the last 14 days: Frontier Airlines (53), Alaska Airlines (19). Each number counts distinct departure dates, not weekly flights; check current availability in search.
Which airline has the lowest fare from Seattle to Denver?
Cheapest airline from Seattle to Denver: Frontier Airlines, €72 (checked 6 Nov 2026).
How observed prices work, what "No data" means and what a fare includes: Read the flight price guide · Price and schedule freshness on Routavio
Keep exploring
Similar routes
Non-stop airlines on this route
More routes from Seattle
Show all 35 routes →Show fewer ↑
More routes to Denver
Show all 36 routes →Show fewer ↑
Recently observed fares. Prices may change.