Dulles (IAD) to Seattle (SEA) flights
3 airlines fly nonstop from Dulles (IAD) to Seattle (SEA): Alaska Airlines, Delta Air Lines and United Airlines. The two airports are 2,300 miles (3,701 km) apart. Alaska Airlines is in oneworld, Delta Air Lines is in SkyTeam and United Airlines is in Star Alliance. There are also 53 ways to fly it with one stop, through Minneapolis, Pittsburgh and Cleveland and more.
Airlines flying nonstop from IAD to SEA
- Alaska Airlinesoneworld · bookable with 9 programsWho books it
- Delta Air LinesSkyTeam · bookable with 8 programsWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book IAD to SEA with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Aeromexico RewardsBooks Delta Air Lines
- Air Canada AeroplanBooks United Airlines
- Air France-KLM Flying BlueBooks Delta Air Lines
- Air New Zealand AirpointsBooks United Airlines
- Alaska Atmos RewardsBooks Alaska Airlines
- American AAdvantageBooks Alaska Airlines
- ANA Mileage ClubBooks United Airlines
- Avianca LifeMilesBooks United Airlines
- British Airways ClubBooks Alaska Airlines
- Cathay Pacific Asia MilesBooks Alaska Airlines
- China Eastern Eastern MilesBooks Delta Air Lines
- Delta SkyMilesBooks Delta Air Lines
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- Finnair PlusBooks Alaska Airlines
- Garuda Indonesia GarudaMilesBooks Delta Air Lines
- Iberia ClubBooks Alaska Airlines
- JAL Mileage BankBooks Alaska Airlines
- JetBlue TrueBlueBooks United Airlines
- Korean Air SKYPASSBooks Delta Air Lines
- Lufthansa Miles & MoreBooks United Airlines
- Qantas Frequent FlyerBooks Alaska Airlines
- Qatar Airways Privilege ClubBooks Alaska 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
IAD to SEA with one stop
53 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Minneapolis (MSP)Delta Air Lines and Sun Country Airlines the whole way
- Via Pittsburgh (PIT)United Airlines, then Alaska Airlines and American Airlines
- Via Cleveland (CLE)United Airlines, then Alaska Airlines
- Via Chicago (ORD)United Airlines the whole way+1
- Via Detroit (DTW)Delta Air Lines the whole way
- Via Columbus (CMH)United Airlines, then Alaska Airlines
- Via Bozeman (BZN)United Airlines, then Alaska Airlines and Delta Air Lines
- Via Indianapolis (IND)United Airlines, then Alaska Airlines and American Airlines
- Via Cincinnati (CVG)United Airlines, then Delta Air Lines and Alaska Airlines
- Via Jackson (JAC)United Airlines, then Alaska Airlines
- Via Calgary (YYC)WestJet the whole way
- Via Saint Louis (STL)United Airlines, then Alaska Airlines and Southwest Airlines
- Via Toronto (YYZ)Air Canada the whole way
- Via Kansas City (MCI)United Airlines, then Alaska Airlines, Southwest Airlines and 1 more
- Via Portland (PDX)United Airlines, then Alaska Airlines and Delta Air Lines
IAD to SEA: common questions
Which airlines fly nonstop from IAD to SEA?
Alaska Airlines (oneworld), Delta Air Lines (SkyTeam) and United Airlines (Star Alliance) fly nonstop from Dulles (IAD) to Seattle (SEA).
How far is Dulles from Seattle by plane?
Dulles (IAD) and Seattle (SEA) are 2,300 miles (3,701 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book IAD to SEA award flights?
30 programs can book at least one of the nonstop airlines: Aeromexico Rewards, Air Canada Aeroplan, Air France-KLM Flying Blue, Air New Zealand Airpoints, Alaska Atmos Rewards, American AAdvantage, ANA Mileage Club, Avianca LifeMiles and 22 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does IAD to SEA cost?
It depends on the program: each prices the route from its own chart or dynamically. The Award Flight Pricer compares 30+ programs for IAD to SEA with taxes and fees.
Where can I connect between Dulles and Seattle?
The most direct connections are through Minneapolis (MSP), Pittsburgh (PIT), Cleveland (CLE), Chicago (ORD) and Detroit (DTW). On 21 of them the same airline flies both flights, for example Delta Air Lines through Minneapolis.
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.