Cheap flights from Denver to Seattle (DEN–SEA)
DENDenver International Airport
United States
United States
SEASeattle–Tacoma International Airport
United States
United States
Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines fly Denver to Seattle (DEN–SEA) nonstop and back, a great-circle distance of 1,650 km (1,020 mi).
- From
- DEN
- Denver
- To
- SEA
- Seattle
- Nonstop
- Yes · 5 airlines
- Airlines
- AS · DL · F9 · WN · UA
- Cheapest fare found
- $80 one-way
- Distance
- 1,650 km (1,020 mi)
- Time difference
- Seattle 1 hour behind
- Most flights
- United Airlines
- Time in the air
- 2h 23m · 2h 09m back
- On time (Touchdown Index)
- 82.9%
- Flights a week
- AS ~30 · DL ~20 · F9 ~5 · WN ~25 · UA ~30
- Aircraft seen
- Boeing 737-800 · Airbus A220-300 · Boeing 737 Max 8
Network data imported from airport and airline sources:· How we verify
Denver to Seattle fares by month
Cheapest one-way fare found: $80 for November 2026 on United Airlines, nonstop. Nonstop from $80.
- Oct ’26$168
- Nov ’26$80
Cheapest one-way fares per month of departure in the Aviasales price cache, found . Fares change by the hour: the live fare is shown when you search.
When to fly DEN–SEA
Days in Seattle average 18–28 °C in May, June, July, August and September. Set your watch 1 hour back on landing at SEA.
Denver to Seattle: frequently asked questions
Fares: Aviasales price cache, 8 October 2026; tracked flights between 6 September and 3 October 2026, from public ADS-B data.
How much is a flight from Denver (DEN) to Seattle–Tacoma (SEA)?
From $80 one-way, the cheapest fare found for November 2026 on United Airlines, nonstop; nonstop from $80 (found 8 October 2026).
How long is the DEN–SEA flight?
2h 23m wheels-up to wheels-down, the median of 454 tracked flights; SEA–DEN took 2h 09m.
Which airlines fly DEN–SEA direct?
Alaska Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines.
What is the time difference between Denver and Seattle?
Seattle is 1 hour behind Denver: a DEN departure at noon is 11:00 local time in SEA.
Is DEN–SEA usually on time?
82.9% of 790 DEN–SEA flights landed within 15 minutes of their usual time; 3.7% were over an hour late.
How many DEN–SEA flights a week?
Alaska Airlines 30, Delta Air Lines 20, Frontier Airlines 5, Southwest Airlines 25 and United Airlines 30 each way.
What aircraft fly DEN–SEA?
Boeing 737-800, Airbus A220-300 and Boeing 737 Max 8.
Seattle to Denver: the return flight (SEA–DEN)
All 5 airlines also fly SEA–DEN nonstop.
The return takes 2h 09m in the air (median of 421 tracked flights), 14 minutes shorter than DEN–SEA.
Airlines flying DEN–SEA nonstop
| Airline | Usually takes off (DEN time) | Type | Alliance | Notes |
|---|---|---|---|---|
 Alaska Airlines AS | 08:31–20:15 | full-service | oneworld | — |
 Delta Air Lines DL | 06:04–19:01 | full-service | SkyTeam | — |
 Frontier Airlines F9 | 07:29–13:40 | low-cost | — | — |
 Southwest Airlines WN | 09:19–21:48 | low-cost | — | — |
| United Airlines UA | 08:12–21:23 | full-service | Star Alliance | — |
One-stop alternatives to flying DEN–SEA nonstop
One airline on both legs; check it's sold as one ticket.
- Via Salt Lake City (SLC) with Delta Air Lines and Frontier Airlines: 1,730 km (1,080 mi) flown, 5% further than nonstop.
- Via Portland (PDX) with Alaska Airlines: 1,800 km (1,120 mi) flown, 9% further than nonstop.
- Via Calgary (YYC) with
WestJet: 2,170 km (1,350 mi) flown, 32% further than nonstop.
DEN–SEA route map
More from Denver and Seattle
Other arrivals in United States
Also nonstop from DEN, nearest to SEA first (straight-line distance):
- DEN–PDX: Portland · 208 km (129 mi) from SEA
- Pasco (PSC) · 276 km (172 mi) from SEA
- Spokane (GEG) airport guide · 359 km (223 mi) from SEA
- Redmond (RDM) · 366 km (228 mi) from SEA
- Eugene (EUG) · 376 km (234 mi) from SEA
Explore the airlines’ route maps
- Alaska Airlines route map and destinations
- Delta Air Lines route map and destinations
- Frontier Airlines route map and destinations
- Southwest Airlines route map and destinations
- United Airlines route map and destinations
Plan your arrival at Seattle–Tacoma International Airport (SEA)
Departure
Denver International Airport
Denver (DEN), Denver. In our data, 23 airlines fly nonstop from DEN to 165 destinations.
View DEN airport guide →Arrival
Seattle–Tacoma International Airport
2 ways into Seattle, fastest from 25 min:
- Link light rail (1 Line) 38–40 min · $3
- Taxi or rideshare 25–45 min
Weather in Seattle vs Denver
Seattle is warmer than Denver in 0 months and cooler in 9; the biggest gap is in June (22°C against 30°C). In October it averages 16°C in Seattle and 20°C in Denver.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Seattle | 9° | 10° | 12° | 15° | 19° | 22° | 25° | 25° | 22° | 16° | 11° | 8° |
| Denver | 9° | 9° | 14° | 18° | 23° | 30° | 33° | 32° | 28° | 20° | 13° | 9° |
Average daily highs. Climate normals from Climate of Seattle and Denver (Wikipedia, CC BY-SA), which cite the national weather services.
Onward from Seattle
Places you can't fly to nonstop from DEN, but can from SEA — for a stopover or a second leg.
Related routes
Sources
- en.wikipedia.org — airlines and destinations, checked 2026-10-01
- en.wikipedia.org — airlines and destinations, checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
- en.wikipedia.org — airlines and destinations table (passenger), checked 2026-10-01
Flight tracking: adsb.lol community ADS-B data (CC0), 6 September – 3 October 2026. Times are median wheels-up to wheels-down; add taxiing for gate-to-gate.
Report a change — seen something different at the airport or on the airline's site? We re-check and log corrections publicly.