SEA → PHLSeattle to Philadelphia

live

Direct flights from Seattle (SEA) to Philadelphia (PHL): 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 13 minutes early. No cancellations were recorded across the 7 tracked flights. The nonstop covers 3,818 km, an estimated 5 hours 24 minutes in the air. Measured by Pro Flight Search from live flight boards at Seattle and Philadelphia. Updated 7 September 2026 at 00:59 UTC.

SEA Seattle smooth · +4
PHL Philadelphia smooth · +0
3,818 km · ~5h 24m est.
dep bank 08:10–21:5821x weekly
Runs mixed · 3 airlines · 21x weekly · nonstop
71% on time

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

Median arrival delay is −13 min. 0 of 7 tracked legs cancelled in the sample. Will a delayed flight be cancelled? →

Median arrival−13 minacross the last 7 operated legs
Flight time~5h 24mestimated 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 AirlinesAmerican AirlinesDelta Air Lines

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 AS442 09:40 daily · AS371 21:27 daily

American AirlinesAA

Flights AA986 08:10 daily · AA2870 12:50 Mo Th Fr Sa Su · AA2886 21:58 daily

Delta Air LinesDL

Flights DL1114 21:30 daily

History

operated legs · board outcomes
09-06AS442arrived−26
09-06DL1114arrived−12
09-05AA2886dep −10 → arr−15
09-05AA986dep +3 → arr−13
09-05AS371arrived+21
09-05AS442arrived+51
09-05DL1114arrived−34

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 +4 min smooth 🌤 few clouds · W 5 kt Full SEA delay board →
PHLPhiladelphia +0 min smooth 🌤 few clouds · SE 7 kt Full PHL delay board →

Weather lens

Current conditions put the pressure at PHL: 41% odds of a 15+ minute delay and around +13 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 Philadelphia route actually runs

Pro Flight Search records official board updates for nonstop SEA to PHL 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 Philadelphia (PHL) route reliability, measured from operated flights on official airport boards.

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

SEA to PHL questions

Is SEA–PHL running on time right now?

Smooth skies ahead. The departure side at SEA is the weaker end, route health score 96/100. The airports section above carries the live status and delay window at both ends.

Morning or evening flight on SEA–PHL?

Operators schedule morning departures around 08:10 and evening departures around 21:27 from SEA. Earlier flights typically land before destination-airport delays accumulate later in the day; check the PHL delay card to confirm conditions when you'd arrive.

How long is the flight from SEA to PHL?

Great-circle distance is 3,818 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 300–357 min gate-to-gate on this route.

How often does SEA–PHL fly?

3 carriers operate this route, around 40 flights a week between them. Compare carrier days and times in the airline list above.