Dulles to Seattle (IAD–SEA) — Airlines, Schedules & Connections
No flights match your filters.
No scheduled airline flights on this route — it's flown by charter / private operators (). No nonstop flights on this route. connecting options below.
Most recently operated nonstop flights — the month shown is when each was last scheduled. Most destinations remain reachable with a connection.
No discontinued nonstop flights on record for this route.
IAD–SEA is served by 6 airlines with nonstop service. Alaska Airlines, United Airlines and Delta Air Lines lead the route. The flight covers 2,300 miles in approximately 5h 45m. Beyond nonstop, 1-stop connecting options are also available.
Airline Landscape
| Airline | Freq/wk | Aircraft | Duration | Dep OTP | Alliance | Codeshares |
|---|---|---|---|---|---|---|
| AS Alaska Airlines Also: AY, JL, JX, QR | 28 | 739, 73J, 7M9 | 5h36-5h47 | Oneworld | AY, JL, JX, QR | |
| UA United Airlines Also: AV, AZ, CM, ET, OS, SN | 21 | 320, 739, 7M9 | 5h46-5h54 | Star Alliance | AV, AZ, CM, ET, OS, SN | |
| DL Delta Air Lines Also: KE, MU | 7 | 223 | 5h40 | SkyTeam | KE, MU | |
| FI Icelandair | 0 | – | – | – | – | |
| HA Hawaiian Airlines | 0 | – | – | – | – | |
| IB Iberia | 0 | – | – | Oneworld | – |
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 | 6 | 6 |
| Weekly flights | 133 | 32 | 25 |
| Flight time | 5h 45m | 5h 40m | 5h 39m |
| Departure OTP | 82% | – | – |
Travel Essentials
IAD: EDT · SEA: PDT
When it's 6:00 PM in Dulles, it's 3:00 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, United Airlines, Delta Air Lines, Icelandair, Hawaiian Airlines and Iberia. With 133 weekly departures, this is a heavily served route.
IAD to SEA Flight Duration and Schedule
Nonstop flight time from IAD to SEA is about 5 hours 45 minutes gate to gate. The route covers a distance of 2,300 miles (3,702 km). There are approximately 133 weekly flights outbound and 119 return, totaling 252 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Detroit Metropolitan Wayne County, Minneapolis–Saint Paul and Salt Lake City. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Washington (DCA) and Baltimore (BWI).