Dulles to Seattle (IAD–SEA) — Airlines, Schedules & Connections
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No nonstop flights on this route. connecting options below.
IAD–SEA is served by 6 airlines with nonstop service. Alaska Airlines, United Airlines and avianca lead the route. The flight covers 2,300 miles in approximately 5h 2m. Beyond nonstop, 92 hubs offer 1-stop connections.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines | 16 | 73J, 7M9 | 5h19-6h08 | Oneworld | – | |
| UA United Airlines | 14 | 738, 7M9 | 5h02-5h58 | Star Alliance | – | |
| AV avianca | 7 | 7M8 | 6h01 | Star Alliance | – | |
| CM Copa Airlines | 7 | 7M8 | 6h01 | Star Alliance | – | |
| DL Delta Air Lines | 7 | BCS3 | 6h01 | SkyTeam | – | |
| ET Ethiopian Airlines | 7 | 7M8 | 6h01 | Star Alliance | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Other ways to reach Seattle from Dulles
| Metric | IAD→SEA | DCA→SEA | BWI→SEA |
|---|---|---|---|
| Distance from IAD | – | 23 mi | 45 mi |
| Nonstop airlines | 6 | 2 | 1 |
| Weekly flights | 58 | 28 | 7 |
| Flight time | 5h 2m | 4h 56m | 4h 49m |
| Departure OTP | 48% | – | – |
Travel Essentials
IAD: EDT · SEA: MDT
When it's 6:00 PM in Dulles, it's 4:00 PM in Seattle.
WMATA Silver Line Metro now reaches Dulles directly; take Silver Line to Washington Dulles Airport station (about 65 min from Metro Center, ~$7). The connection opened in late 2022.Ride-shares from downtown DC run $35–60 and take 35–50 minutes via I-66 (longer during peak hours). Washington Flyer coach to Wiehle-Reston East Metro costs $6. The airport is 27 miles from downtown; taxis are expensive ($60–80).
Link Light Rail from the airport station (inside the terminal) to downtown Seattle takes 38 minutes ($3.50). No transfers needed; trains run 5am to 1am daily.Taxis and ride-shares to downtown cost $35–55. For Bellevue and Eastside destinations (across Lake Washington), ride-share is faster than Link. Car rentals are in the consolidated rental facility; take the free shuttle from baggage claim. Sound Transit buses serve Tacoma, Renton, and Federal Way.
Marine west coast climate. Winters are mild but persistently grey and rainy (3–9°C). Snow is rare at sea level but can occur December through February, causing significant disruptions when it does. The airport sits between Seattle and Tacoma in an area that receives more fog and low cloud than downtown Seattle.
Summers are famously pleasant (18–25°C) with low humidity and mostly clear skies, one of the best flying climates in the US from June through September. The wettest months are November through January.
IAD–SEA Quick Facts
Frequently Asked Questions
Flights from IAD to SEA
Washington Dulles International Airport (IAD) and Seattle–Tacoma International Airport (SEA) are connected by nonstop service from Alaska Airlines, avianca, Copa Airlines, Delta Air Lines, Ethiopian Airlines and United Airlines. With 58 weekly departures, this is a heavily served route.
IAD to SEA Flight Duration and Schedule
Nonstop flight time from IAD to SEA ranges from 5 hours 2 minutes to 6 hours 8 minutes. The route covers a distance of 2,300 miles (3,702 km). There are approximately 58 weekly flights outbound and 45 return, totaling 103 flights per week in both directions.
Connecting Options and Alternatives
92 one-stop connections are available, with the fastest taking approximately 6 hours via UES. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Washington (DCA) and Baltimore (BWI).