Seattle (SEA) to Philadelphia (PHL) flights
American Airlines, Alaska Airlines, Delta Air Lines fly nonstop from Seattle-Tacoma International Airport to Philadelphia International Airport, with about 40 flights a week in July 2026. The 2,379-mile flight takes about 5h 2m gate to gate.
- Distance
- 2,379 mi · 3,829 km
- Flight time
- 5h 2m
- Airlines
- 3
- Seats filled
- 87%
Airlines flying SEA to PHL
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| American Airlines | 19 | Airbus A321, Boeing 737 MAX 8, Boeing 737-800 | 103,008 | 5h 0m |
| Alaska Airlines | 14 | Boeing 737-900ER, Boeing 737 MAX 9, Boeing 737-800 | 102,265 | 5h 3m |
| Delta Air Lines | 7 | Airbus A321, Boeing 737-800 | 12,009 | 5h 7m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
SEA to PHL flight schedule
10 flight numbers flew this route in August 2026, 5 of them almost daily. The first usually leaves at 8:10am and the last at 10:35pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| AA 986American Airlines | 8:10am | 4:32pm | 27 | 85% |
| AA 3219American Airlines | 8:20am | 4:42pm | 4 | 80% |
| AS 442Alaska Airlines | 8:28am | 4:43pm | 31 | 75% |
| AA 2534American Airlines | 12:40pm | 9:06pm | 4 | 77% |
| AA 2870American Airlines | 12:50pm | 9:09pm | 20 | 55% |
| AS 371Alaska Airlines | 9:27pm | 5:40am | 13 | 88% |
| DL 1114Delta Air Lines | 9:30pm | 5:50am | 31 | 84% |
| AA 2886American Airlines | 9:58pm | 6:16am | 27 | 100% |
| AS 522Alaska Airlines | 10:02pm | 6:13am | 17 | 86% |
| AA 2522American Airlines | 10:35pm | 6:48am | 4 | 86% |
Is SEA to PHL on time?
From September 2025 to August 2026, 83% of 1,431 flights arrived within 15 minutes of schedule and 1.5% were cancelled. Flights leaving around 9pm were the most punctual (87%), those around 8am the least (75%). Most delay time was caused by the airline (crew, maintenance, cleaning, fuelling) (38%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| American Airlines | 660 | 85% | 17 min | 2.1% |
| Alaska Airlines | 657 | 81% | 10 min | 1.1% |
| Delta Air Lines | 114 | 83% | 10 min | 0.9% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 6am to 7am | 36 | 91% | |
| 7am to 8am | 33 | 82% | |
| 8am to 9am | 173 | 75% | |
| 9am to 10am | 325 | 79% | |
| 12pm to 1pm | 162 | 83% | |
| 9pm to 10pm | 330 | 87% | |
| 10pm to 11pm | 290 | 86% | |
| 11pm to 12am | 82 | 81% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 135 | 24,251 | |
| September 2025 | 121 | 20,377 | |
| October 2025 | 121 | 19,043 | |
| November 2025 | 86 | 12,658 | |
| December 2025 | 92 | 14,498 | |
| January 2026 | 64 | 8,763 | |
| February 2026 | 53 | 7,623 | |
| March 2026 | 74 | 11,699 | |
| April 2026 | 114 | 17,595 | |
| May 2026 | 157 | 23,317 | |
| June 2026 | 170 | 27,484 | |
| July 2026 | 177 | 29,974 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.