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).

SEA

% 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

Pick an hour to see this route’s flights leaving then.

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 in the current schedule

Every flight that flew in the Jun 6 – Jul 31, 2026 schedule, with its record over Aug 2025 – Jul 2026. Times are local. Click a column to sort.


AA 3219	SEA 08:20	PHL 16:42	5h 22m	72	82%	4.2%	141 min
AS 442	SEA 08:28	PHL 16:43	5h 15m	364	76%	1.4%	45 min
DL 1114	SEA 09:25	PHL 17:35	5h 10m	82	85%	1.2%	46 min
AA 2534	SEA 12:44	PHL 21:06	5h 25m	65	80%	0.0%	86 min
AS 371	SEA 21:22	PHL 05:35	5h 13m	154	90%	0.0%	41 min
AS 522	SEA 22:02	PHL 06:13	5h 11m	52	88%	0.0%	38 min
AA 2522	SEA 22:35	PHL 06:48	5h 13m	72	86%	4.2%	47 min

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