Route
SEA → PHL
Seattle–Tacoma International Airport Philadelphia International Airport
How punctual is this route?
- On-time arrivals
- 82.7%
- Less than 15 minutes late
- Cancelled
- 1.5%
- Of scheduled flights
- Average delay when late
- 76 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,431
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 38%
- Late-arriving aircraft 37%
- Air traffic control & airport 14%
- Extreme weather 10%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.0% | 121 |
| October 2025 | 86.8% | 123 |
| November 2025 | 84.9% | 87 |
| December 2025 | 80.4% | 93 |
| January 2026 | 77.8% | 67 |
| February 2026 | 86.8% | 55 |
| March 2026 | 83.8% | 76 |
| April 2026 | 93.9% | 114 |
| May 2026 | 82.2% | 158 |
| June 2026 | 86.9% | 173 |
| July 2026 | 76.1% | 185 |
| August 2026 | 77.4% | 179 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| American Airlines | 660 | 84.6% | 2.1% | 109 min |
| Alaska Airlines | 657 | 80.7% | 1.1% | 52 min |
| Delta Air Lines | 114 | 83.2% | 0.9% | 58 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
AS442
25% late · 364 flights
-
AS371
12% late · 167 flights
-
AA2361
18% late · 118 flights
-
DL1114
16% late · 113 flights
-
AA2522
14% late · 76 flights
-
AA3219
20% late · 76 flights
-
AA2534
24% late · 69 flights
-
AS522
14% late · 69 flights
-
AS444
9% late · 54 flights
-
AA2763
7% late · 44 flights
-
AA872
5% late · 44 flights
-
AA2358
9% late · 36 flights
-
AA1095
25% late · 33 flights
-
AA2841
18% late · 33 flights
-
AA2886
0% late · 28 flights
-
AA2086
0% late · 27 flights
-
AA2760
11% late · 27 flights
-
AA986
15% late · 27 flights
-
AA2870
45% late · 22 flights
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