Route · SFO → SEA · 2020–2025 BTS data
San Francisco to Seattle
The SFO–SEA corridor (San Francisco, CA → Seattle, WA) runs ahead of the national average, served by 26 carriers across roughly 679 miles.
Data updated 2026-06-13
- 82.1%
- On-time
- +3.1 pts
- vs US avg
- 63 min
- Delay when late
- 37,671
- Flights
Cancelled
1.3%
Best Month
Jan 2025 88%
Worst Month
Jun 2025 66%
Distance
679 mi
Carriers
26
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 559 | 145 | 4 | 3 | DL,AS,UA,OO |
| Nov 2025 | 565 | 114 | 12 | 0 | OO,UA,DL,AS |
| Oct 2025 | 585 | 155 | 6 | 0 | AS,OO,UA,DL |
| Sep 2025 | 585 | 128 | 3 | 1 | UA,OO,DL,AS |
| Aug 2025 | 620 | 176 | 4 | 0 | OO,UA,AS,DL |
| Jul 2025 | 639 | 207 | 13 | 0 | AS,DL,OO,UA |
| Jun 2025 | 631 | 214 | 4 | 0 | AS,DL,OO,UA |
| May 2025 | 636 | 179 | 2 | 0 | AS,DL,OO,UA |
| Apr 2025 | 540 | 82 | 4 | 0 | DL,OO,UA,AS |
| Mar 2025 | 553 | 119 | 2 | 2 | AS,DL,OO,UA |
| Feb 2025 | 482 | 99 | 11 | 1 | AS,DL,OO,UA |
| Jan 2025 | 526 | 65 | 0 | 0 | AS,DL,OO,UA |
| Dec 2024 | 533 | 126 | 2 | 0 | AS,DL,OO,UA |
| Nov 2024 | 547 | 100 | 9 | 0 | OO,UA,AS,DL |
| Oct 2024 | 609 | 98 | 5 | 0 | UA,AS,OO,DL |
| Sep 2024 | 617 | 154 | 5 | 0 | OO,UA,AS,DL |
| Aug 2024 | 628 | 189 | 12 | 0 | AS,DL,OO,UA |
| Jul 2024 | 624 | 173 | 15 | 0 | AS,DL,OO,UA |
| Jun 2024 | 523 | 168 | 2 | 0 | AS,DL,OO,UA |
| May 2024 | 547 | 165 | 4 | 0 | AS,DL,OO,UA |
| Apr 2024 | 515 | 150 | 1 | 0 | AS,DL,OO,UA |
| Mar 2024 | 521 | 155 | 3 | 1 | AS,DL,OO,UA |
| Feb 2024 | 445 | 96 | 3 | 1 | AS,DL,OO,UA |
| Jan 2024 | 489 | 83 | 51 | 0 | AS,DL,OO,UA |
Cancellation Rate
1.3%
177 of 13,519 flights
Diversion Rate
0.1%
9 of 13,519 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
Origin airport →SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Destination airport →Compare the two airports
See SFO 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 SFO–SEA.
Routes with a similar on-time rate
What the Data Says About SFO to SEA
Bureau of Transportation Statistics records show San Francisco to Seattle (SFO to SEA) running a 82.1% on-time rate over 37,671 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 62.8 minutes. The 679-mile corridor is served by 26 carriers, and over the last 24 months 1.3% of 13,519 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Jan 2025 posted the strongest performance at 88% on-time, while Jun 2025 came in at just 66% - a 22-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.