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1,388 nonstop flights · Aug 2025 – Jul 2026 · US DOT on-time records, all US airlines

No clear winner: airlines and hours on this route all land within a few points of 83% on time.

Best time to leave 9–10 pm 86% arrive on time from SEA
Best single flight AS 371 SEA 21:22 → PHL 05:35 · 90% on time Avoid AS 442 SEA 08:28 → PHL 16:43 · 76% on time

Time of day × airport

Share of this route’s flights leaving within 15 minutes, by airport and scheduled departure hour, over Aug 2025 – Jul 2026. Blank: no flights then (or fewer than 40 in the year).

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SEA
82
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75
% of this route’s flights leaving within 15 min (small number: flights in the Jun 6 – Jul 31, 2026 schedule): 85+75–8465–7455–64under 55
Philadelphia flights leaving SEA 9–10 am: 1Close ×
DL 1114 SEA 09:25 PHL 17:35 5h 10m 82 85% 1.2% 46 min

Airlines on this route

Arriving within 15 minutes. Regional flights count under the airline that sells them. Pick an airline to see its flights.
American 648 85% 2.2% 91 min
Alaska 657 81% 0.9% 45 min
Delta 83 – 1.2% 46 min

Dimmed: fewer than 150 flights in the year, too few to rank.

Flights, best and worst

Flights in the Jun 6 – Jul 31, 2026 schedule that ran 150+ times in the year. Times are local. Pick a flight for its history.
AS 371 SEA 21:22 PHL 05:35 90%
AS 442 SEA 08:28 PHL 16:43 76%
All 7 flights on this route →

Nonstops by airline and airport

Arriving within 15 minutes, Aug 2025 – Jul 2026. Pick a row to see that airline’s flights on that airport pair.
American SEA PHL 5h 13m 85% 2.2% 648 Flying now
Delta SEA PHL 5h 10m 84% 1.2% 83 Flying now
Alaska SEA PHL 5h 15m 81% 0.9% 657 Flying now
Flying on a particular day? Pick a date above and the same ranking uses our forecast odds for each flight that day: Tomorrow.

About this data: US DOT on-time records, Aug 2025 – Jul 2026, all US airlines; regional flights count under the airline that sells them. Schedules (which flights and connections exist, and their times) are as of Jun 6 – Jul 31, 2026; seasonal flights outside that window aren’t ranked. Rebuilt monthly. JSON