Houston (IAH) to Seattle (SEA) flights
2 airlines fly nonstop from Houston (IAH) to Seattle (SEA): Alaska Airlines and United Airlines. The two airports are 1,872 miles (3,013 km) apart. Alaska Airlines is in oneworld and United Airlines is in Star Alliance. There are also 63 ways to fly it with one stop, through Vail, Hayden and Salt Lake City and more.
Airlines flying nonstop from IAH to SEA
- Alaska Airlinesoneworld · bookable with 9 programsWho books it
- United AirlinesStar Alliance · bookable with 13 programsWho books it
Book IAH to SEA with points
Loyalty programs that can book at least one of the nonstop airlines, from the Award Booking Guide.
- Air Canada AeroplanBooks United Airlines
- 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
- Emirates SkywardsBooks United Airlines
- EVA Air Infinity MileageLandsBooks United Airlines
- Finnair PlusBooks Alaska Airlines
- Iberia ClubBooks Alaska Airlines
- JAL Mileage BankBooks Alaska Airlines
- JetBlue TrueBlueBooks United Airlines
- Lufthansa Miles & MoreBooks United Airlines
- Qantas Frequent FlyerBooks Alaska Airlines
- Qatar Airways Privilege ClubBooks Alaska Airlines
- 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
IAH to SEA with one stop
63 connections, most direct first. 2-stop routings and flight times are in Routes with Pro.
- Via Vail (EGE)United Airlines, then Alaska Airlines
- Via Hayden (HDN)United Airlines, then Alaska Airlines
- Via Salt Lake City (SLC)Delta Air Lines the whole way
- Via Dallas (DFW)American Airlines the whole way
- Via Denver (DEN)Frontier Airlines and United Airlines the whole way
+3 - Via Jackson (JAC)United Airlines, then Alaska Airlines
- Via Austin (AUS)United Airlines, then Alaska Airlines, Delta Air Lines and 1 more
- Via Oklahoma City (OKC)United Airlines, then Alaska Airlines
- Via Albuquerque (ABQ)United Airlines, then Alaska Airlines and Delta Air Lines
- Via Bozeman (BZN)United Airlines, then Alaska Airlines and Delta Air Lines
- Via Portland (PDX)Alaska Airlines the whole way
- Via San Antonio (SAT)United Airlines, then Alaska Airlines
- Via Wichita (ICT)United Airlines, then Alaska Airlines
- Via Tulsa (TUL)United Airlines, then Alaska Airlines
- Via Kalispell (FCA)United Airlines, then Alaska Airlines
IAH to SEA: common questions
Which airlines fly nonstop from IAH to SEA?
Alaska Airlines (oneworld) and United Airlines (Star Alliance) fly nonstop from Houston (IAH) to Seattle (SEA).
How far is Houston from Seattle by plane?
Houston (IAH) and Seattle (SEA) are 1,872 miles (3,013 km) apart along the great circle, the shortest path a flight can take. Connections add distance on top.
Which points programs can book IAH to SEA award flights?
22 programs can book at least one of the nonstop airlines: Air Canada Aeroplan, Air New Zealand Airpoints, Alaska Atmos Rewards, American AAdvantage, ANA Mileage Club, Avianca LifeMiles, British Airways Club, Cathay Pacific Asia Miles and 14 more. Which flights each can book depends on its partners, so check the airline before you transfer points.
How many miles does IAH 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 IAH to SEA with taxes and fees.
Where can I connect between Houston and Seattle?
The most direct connections are through Vail (EGE), Hayden (HDN), Salt Lake City (SLC), Dallas (DFW) and Denver (DEN). On 22 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.