SEA → IADSeattle to Washington

live

Direct flights from Seattle (SEA) to Washington (IAD): 21 nonstop departures observed each week across 3 airlines. 71% of the last 7 operated flights arrived within 15 minutes of schedule. The median arrival is 18 minutes early. No cancellations were recorded across the 7 tracked flights. The nonstop covers 3,702 km, an estimated 5 hours 15 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Washington. Updated 15 September 2026 at 13:23 UTC.

SEA Seattle smooth · +12
IAD Washington smooth · +0
3,702 km · ~5h 15m est.
dep bank 08:10–23:0421x weekly
Runs mixed · 3 airlines · 21x weekly · nonstop
71% on time

of the last 7 operated SEA → IAD flights arrived within 15 minutes

Median arrival delay is −18 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−18 minacross the last 7 operated legs
Flight time~5h 15mestimated from route distance
Weekly departures21x3 direct airlines on the leg

The week

scheduled departures · origin local time
06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Alaska AirlinesDelta Air LinesUnited Airlines

Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.

Who flies it

observed on the boards · 7 days
Alaska AirlinesAS

Flights AS737 varies daily · AS675 15:56 daily · AS367 21:35 daily

Delta Air LinesDL

Flights DL541 varies daily

United AirlinesUA

Flights UA1523 08:10 daily · UA2483 23:04 Mo We Th Fr Sa Su

History

operated legs · board outcomes
09-14AS367arrived−7
09-14AS675arrived+37
09-14AS737arrived−21
09-14DL541arrived−24
09-14UA1523arrived−22
09-14UA2483arrived−18
09-13AS367arrived+57

Actual board outcomes rather than schedules, paired departure and arrival per flight and day.

Full board history, day by day →

Airports right now

live boards
SEASeattle +12 min smooth 🌤 overcast · ENE 5 kt Full SEA delay board →
IADWashington +0 min smooth 🌤 few clouds · N 0 kt Full IAD delay board →

Weather lens

Current conditions put the pressure at SEA and IAD: 35% odds of a 15+ minute delay and around +2 min expected when it bites, measured from this route's own weather-matched delay history. See live delays → · Weather risk by airport →

How the Seattle to Washington route actually runs

Pro Flight Search records official board updates for nonstop SEA to IAD flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.

Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure

Cite this data

Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.

Suggested citation

Pro Flight Search — Seattle (SEA) to Washington (IAD) route reliability, measured from operated flights on official airport boards.

Canonical URL
https://proflightsearch.com/search-flights/SEA-IAD
How we measure this →

SEA to IAD questions

Is SEA–IAD running on time right now?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 92/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SEA–IAD?

Operators schedule morning departures around 08:10 and evening departures around 21:35 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the IAD delay card to confirm conditions when you'd arrive.

How long is the flight from SEA to IAD?

Great-circle distance is 3,702 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 291–347 min gate-to-gate on this route.

How often does SEA–IAD fly?

3 carriers operate this route, around 41 flights a week between them. Compare carrier days and times in the airline list above.