Seattle (SEA) to Denver (DEN) flights
6 airlines fly nonstop from Seattle (SEA) to Denver (DEN): Alaska Airlines, American Airlines, Delta Air Lines, Frontier Airlines, Southwest Airlines and United Airlines. The two airports are 1,022 miles (1,645 km) apart. Alaska Airlines and American Airlines are in oneworld, Delta Air Lines is in SkyTeam and United Airlines is in Star Alliance. There are also 51 ways to fly it with one stop, through Idaho Falls, Pasco and Jackson and more.
Airlines flying nonstop from SEA to DEN
- Alaska Airlinesoneworld · bookable with 9 programsWho books it
- American Airlinesoneworld · bookable with 9 programsWho books it
- Delta Air LinesSkyTeam · bookable with 8 programsWho books it
- Frontier AirlinesNot in an allianceWho books it
- Southwest AirlinesNot in an allianceWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book SEA to DEN with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Alaska Atmos RewardsBooks Alaska Airlines, American Airlines
- American AAdvantageBooks Alaska Airlines, American Airlines
- British Airways ClubBooks Alaska Airlines, American Airlines
- Cathay Pacific Asia MilesBooks Alaska Airlines, American Airlines
- Finnair PlusBooks Alaska Airlines, American Airlines
- Iberia ClubBooks Alaska Airlines, American Airlines
- JAL Mileage BankBooks Alaska Airlines, American Airlines
- Qantas Frequent FlyerBooks Alaska Airlines, American Airlines
- Qatar Airways Privilege ClubBooks Alaska Airlines, American Airlines
- Aeromexico RewardsBooks Delta Air Lines
- Air Canada AeroplanBooks United Airlines
- Air France-KLM Flying BlueBooks Delta Air Lines
- Air New Zealand AirpointsBooks United Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- China Eastern Eastern MilesBooks Delta Air Lines
- Delta SkyMilesBooks Delta Air Lines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- Garuda Indonesia GarudaMilesBooks Delta Air Lines
- JetBlue TrueBlueBooks United Airlines
- Korean Air SKYPASSBooks Delta Air Lines
- Lufthansa Miles & MoreBooks United Airlines
- SAS EuroBonusBooks Delta Air Lines
- Singapore Airlines KrisFlyerBooks United Airlines
- TAP Miles&GoBooks United Airlines
- Thai Royal Orchid PlusBooks United Airlines
- Turkish Airlines Miles&SmilesBooks United Airlines
- United MileagePlusBooks United Airlines
- Virgin Atlantic Flying ClubBooks Delta Air Lines
SEA to DEN with one stop
51 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Idaho Falls (IDA)Alaska Airlines, then United Airlines
- Via Pasco (PSC)Alaska Airlines and Delta Air Lines, then United Airlines
- Via Jackson (JAC)Alaska Airlines, then United Airlines
- Via Sun Valley (SUN)Alaska Airlines and Delta Air Lines, then United Airlines
- Via Hayden (HDN)Alaska Airlines, then United Airlines and Southwest Airlines
- Via Boise (BOI)Alaska Airlines and Delta Air Lines, then Frontier Airlines, United Airlines and 1 more
- Via Spokane (GEG)Alaska Airlines and Delta Air Lines, then United Airlines and Southwest Airlines
- Via Vail (EGE)Alaska Airlines, then United Airlines
- Via Bozeman (BZN)Alaska Airlines and Delta Air Lines, then United Airlines and Southwest Airlines
- Via Missoula (MSO)Alaska Airlines, then United Airlines
- Via Salt Lake City (SLC)Delta Air Lines the whole way+1
- Via Helena (HLN)Alaska Airlines, then United Airlines
- Via Billings (BIL)Alaska Airlines, then United Airlines
- Via Portland (PDX)Alaska Airlines the whole way+1
- Via Redmond (RDM)Alaska Airlines and Delta Air Lines, then United Airlines
SEA to DEN: common questions
Which airlines fly nonstop from SEA to DEN?
Alaska Airlines (oneworld), American Airlines (oneworld), Delta Air Lines (SkyTeam), Frontier Airlines, Southwest Airlines and United Airlines (Star Alliance) fly nonstop from Seattle (SEA) to Denver (DEN).
How far is Seattle from Denver by plane?
Seattle (SEA) and Denver (DEN) are 1,022 miles (1,645 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book SEA to DEN award flights?
30 programs can book at least one of the nonstop airlines: Alaska Atmos Rewards, American AAdvantage, British Airways Club, Cathay Pacific Asia Miles, Finnair Plus, Iberia Club, JAL Mileage Bank, Qantas Frequent Flyer and 22 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does SEA to DEN cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for SEA to DEN with taxes and fees.
Where can I connect between Seattle and Denver?
The most direct connections are through Idaho Falls (IDA), Pasco (PSC), Jackson (JAC), Sun Valley (SUN) and Hayden (HDN). On 15 of them the same airline flies both flights, for example Delta Air Lines through Salt Lake City.
More routes
Routes are scheduled nonstop flights. The route data is refreshed monthly; this list was last checked November 11, 2026. Seasonal routes and new launches can be missing or end early, so confirm with the airline before you book. Distances are great-circle, the shortest path between the two airports.