Seattle to Dulles (SEA–IAD) — 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.
SEA–IAD is served by 7 airlines with nonstop service. Alaska Airlines, United Airlines and Delta Air Lines lead the route. The flight covers 2,300 miles in approximately 5h 3m. 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, QR | 26 | 739, 7M9 | 4h30-5h15 | Oneworld | AY, JL, QR | |
| UA United Airlines Also: AV, CM, ET, OS, SN | 21 | 7M8, 7M9, B39M | 4h59-5h06 | Star Alliance | AV, CM, ET, OS, SN | |
| DL Delta Air Lines Also: KE | 7 | BCS3 | 4h52 | SkyTeam | KE | |
| CX Cathay Pacific | 5 | 7M9 | 5h03 | Oneworld | – | |
| IB Iberia | 5 | 7M9 | 5h15 | Oneworld | – | |
| AZ ITA Airways | 0 | – | – | SkyTeam | – | |
| TWY TWY | 0 | – | – | – | – |
Weekly Schedule Pattern
Connection Landscape
On-Time Performance
Other ways to reach Dulles from Seattle
| Metric | SEA→IAD | BFI→IAD | PAE→IAD |
|---|---|---|---|
| Distance from SEA | – | 5 mi | 32 mi |
| Nonstop airlines | 7 | 9 | 2 |
| Weekly flights | 130 | 2 | 1 |
| Flight time | 5h 3m | 4h 9m | 4h 11m |
| Departure OTP | 58% | – | – |
Travel Essentials
SEA: PDT · IAD: EDT
When it's 6:00 PM in Seattle, it's 9:00 PM in Dulles.
Link Light Rail runs from downtown Seattle (Westlake station) to the airport in 38 minutes ($3.50 peak). Trains run every 6–12 minutes during peak hours from 5am to 1am. Ride-shares run $30–50 from downtown; SR-99 and I-5 can be heavily congested southbound during afternoon rush (3–7pm).
Sound Transit 574 express bus serves Tacoma ($2.50–4). Sounder commuter rail connects Tacoma to the airport area via a shuttle.
Silver Line Metro runs from Washington Dulles Airport station to Metro Center in about 65 minutes (~$7). The route bypasses I-66 and I-495 congestion entirely. Washington Flyer coach also runs to Wiehle-Reston East station ($6, 15 min) for Metro connection.Taxis and ride-shares to downtown DC cost $55–80 and take 35–55 minutes depending on traffic. Car rental facilities are on-site. Dulles is 27 miles west of the Capitol; it is farther than either DCA or BWI from central DC.
Humid continental climate. Summers are hot and muggy (30–36°C) with frequent afternoon thunderstorms that cause delays June through August. Winters bring cold temperatures (−3 to 5°C) with snow and ice. The Virginia suburbs accumulate more snow than downtown DC, and ice storms are the primary disruption risk.
Dulles sits at higher elevation in Virginia's piedmont and sees more winter precipitation than DCA. Spring and fall are variable. Snowfall is possible into April. Thunderstorms begin from April through May.
SEA–IAD Quick Facts
Frequently Asked Questions
Flights from SEA to IAD
Seattle–Tacoma International Airport (SEA) and Washington Dulles International Airport (IAD) are connected by nonstop service from Alaska Airlines, United Airlines, Delta Air Lines, Cathay Pacific, Iberia and ITA Airways. With 130 weekly departures, this is a heavily served route.
SEA to IAD Flight Duration and Schedule
Nonstop flight time from SEA to IAD is about 5 hours 3 minutes gate to gate. The route covers a distance of 2,300 miles (3,702 km). There are approximately 130 weekly flights outbound and 122 return, totaling 252 flights per week in both directions.
Connecting Options and Alternatives
1-stop connecting options are also available, commonly via Pittsburgh, Detroit Metropolitan Wayne County and Minneapolis–Saint Paul. Two-stop connections are also available via intermediate hubs. Nearby alternative airports include Seattle (BFI) and Everett (PAE).