Route · PHL → SEA · 2020–2025 BTS data
Philadelphia to Seattle
The PHL–SEA corridor (Philadelphia, PA → Seattle, WA) runs behind the national average, served by 3 carriers across roughly 2,378 miles.
Data updated 2026-06-13
- 76.5%
- On-time
- -2.5 pts
- vs US avg
- 63 min
- Delay when late
- 5,504
- Flights
Cancelled
1.5%
Best Month
Feb 2024 93%
Worst Month
Dec 2025 39%
Distance
2,378 mi
Carriers
3
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 93 | 57 | 1 | 0 | AS,AA |
| Nov 2025 | 87 | 19 | 0 | 0 | AA,AS |
| Oct 2025 | 123 | 36 | 2 | 0 | AA,AS |
| Sep 2025 | 122 | 24 | 0 | 0 | AA,AS |
| Aug 2025 | 136 | 46 | 2 | 0 | AA,AS |
| Jul 2025 | 123 | 51 | 4 | 1 | AA,AS |
| Jun 2025 | 116 | 53 | 1 | 0 | AA,AS |
| May 2025 | 92 | 32 | 0 | 0 | AA,AS |
| Apr 2025 | 82 | 21 | 0 | 0 | AA,AS |
| Mar 2025 | 71 | 11 | 0 | 0 | AA,AS |
| Feb 2025 | 36 | 8 | 4 | 0 | AA,AS |
| Jan 2025 | 39 | 13 | 0 | 0 | AA,AS |
| Dec 2024 | 86 | 29 | 0 | 0 | AA,AS |
| Nov 2024 | 74 | 13 | 0 | 0 | AS,AA |
| Oct 2024 | 77 | 28 | 0 | 0 | AS,AA |
| Sep 2024 | 92 | 32 | 0 | 1 | AA,AS |
| Aug 2024 | 124 | 46 | 6 | 0 | AA,AS |
| Jul 2024 | 123 | 44 | 2 | 1 | AA,AS |
| Jun 2024 | 116 | 60 | 1 | 0 | AA,AS |
| May 2024 | 93 | 29 | 1 | 0 | AA,AS |
| Apr 2024 | 85 | 24 | 0 | 1 | AA,AS |
| Mar 2024 | 72 | 14 | 0 | 0 | AA,AS |
| Feb 2024 | 54 | 4 | 0 | 0 | AA,AS |
| Jan 2024 | 59 | 16 | 8 | 0 | AA,AS |
Cancellation Rate
1.5%
32 of 2,175 flights
Diversion Rate
0.2%
4 of 2,175 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
PHL - Philadelphia
Full on-time, delay-cause, and seasonal performance for Philadelphia, PA.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See PHL and SEA side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to PHL–SEA.
Routes with a similar on-time rate
What the Data Says About PHL to SEA
The Philadelphia to Seattle corridor (PHL to SEA) posts a 76.5% on-time rate on the lower edge of the average band, based on 5,504 tracked flights. Late flights run 63.1 minutes behind on average. 3 carriers cover the 2,378-mile route; over the last 24 months, 32 of 2,175 flights were cancelled (1.5%) and 0.2% diverted.
The monthly split is wide on this route: Feb 2024 posted the strongest performance at 93% on-time, while Dec 2025 came in at just 39% - a 54-point swing worth factoring into travel timing.
Frequently Asked Questions
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.