Wayfli › Washington (IAD) › To Seattle (SEA)
Washington (IAD) to Seattle (SEA) flights
There are direct flights from Washington Dulles International Airport to Seattle Tacoma International Airport, sold by one airline: United Airlines. The distance is 3,702 km, about 5h in the air. There are also 20 one-stop options, via airports such as Chicago, Dallas-Fort Worth and Atlanta.
Live fares for IAD → SEASee all routes on the map3,702 kmdistance
~5hdirect flight time (estimate)
1direct airline
20one-stop options
Direct flights from Washington to Seattle
| Route | Airlines (incl. codeshares) | Distance | Time (est.) |
|---|---|---|---|
| IAD → SEA | United Airlines | 3,702 km | ~5h |
Best one-stop connections
Through the biggest hubs first. Times include about 100 minutes to change planes.
| Via | Airlines | Distance | Time (est.) |
|---|---|---|---|
| ORD Chicago | United Airlines then American Airlines and Alaska Airlines | 3,707 km | ~7h 10m |
| DFW Dallas-Fort Worth | American Airlines and United Airlines then American Airlines and Alaska Airlines | 4,551 km | ~8h 15m |
| ATL Atlanta | Air France and Aeromexico then Air France and Aeromexico | 4,364 km | ~8h |
| JFK New York | jetBlue and United Airlines then American Airlines and Alaska Airlines | 4,253 km | ~7h 50m |
| EWR Newark | United Airlines then American Airlines and Alaska Airlines | 4,196 km | ~7h 45m |
| DEN Denver | United Airlines and Southwest Airlines then American Airlines and Alaska Airlines | 3,977 km | ~7h 30m |
| YYZ Toronto | Air Canada and United Airlines then Air Canada | 3,863 km | ~7h 25m |
| CLT Charlotte | American Airlines and United Airlines then American Airlines | 4,178 km | ~7h 45m |
| LAS Las Vegas | Frontier Airlines and United Airlines then Alaska Airlines and Southwest Airlines | 4,712 km | ~8h 25m |
| PHL Philadelphia | United Airlines then American Airlines and Alaska Airlines | 4,034 km | ~7h 35m |
| BOS Boston | jetBlue and United Airlines then American Airlines and Alaska Airlines | 4,669 km | ~8h 20m |
| MDW Chicago | Southwest Airlines then Southwest Airlines | 3,709 km | ~7h 10m |
More from Washington and Seattle
- Seattle (SEA) to Washington (IAD) · return route
- All direct flights from Washington (IAD)
- All direct flights from Seattle (SEA)
- Washington to Istanbul (IST)
- Washington to Amsterdam (AMS)
- Washington to Paris (CDG)
- Washington to Frankfurt (FRA)
- Washington to Dubai (DXB)
- Washington to Beijing (PEK)
- Washington to Chicago (ORD)
- Washington to Dallas-Fort Worth (DFW)
- Washington to Madrid (MAD)
- Washington to Rome (FCO)
- Washington to Munich (MUC)
- Washington to London (LHR)
- Istanbul (IST) to Seattle
- Amsterdam (AMS) to Seattle
- Paris (CDG) to Seattle
- Frankfurt (FRA) to Seattle
- Dubai (DXB) to Seattle
- Beijing (PEK) to Seattle
- Chicago (ORD) to Seattle
- Dallas-Fort Worth (DFW) to Seattle
- Shanghai (PVG) to Seattle
- London (LHR) to Seattle
- Atlanta (ATL) to Seattle
- Houston (IAH) to Seattle
Routes come from current airline fares, updated weekly (last update 9 November 2026), plus older schedule data for airports with few recent fares. “Direct” can include a few same-plane flights with a stop. Flight times are estimates from distance. Always check with the airline before booking.