Route · SEA → SFO · 2020–2025 BTS data
Seattle to San Francisco
The SEA–SFO corridor (Seattle, WA → San Francisco, CA) runs ahead of the national average, served by 26 carriers across roughly 679 miles.
Data updated 2026-06-13
- 79.1%
- On-time
- +0.1 pts
- vs US avg
- 62 min
- Delay when late
- 37,651
- Flights
Cancelled
1.1%
Best Month
Jan 2025 87%
Worst Month
Apr 2024 50%
Distance
679 mi
Carriers
26
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 558 | 188 | 4 | 0 | DL,AS,UA,OO |
| Nov 2025 | 567 | 154 | 13 | 1 | OO,UA,DL,AS |
| Oct 2025 | 584 | 156 | 7 | 0 | AS,OO,UA,DL |
| Sep 2025 | 584 | 144 | 4 | 0 | UA,OO,DL,AS |
| Aug 2025 | 619 | 160 | 4 | 2 | OO,UA,AS,DL |
| Jul 2025 | 639 | 184 | 12 | 0 | AS,DL,OO,UA |
| Jun 2025 | 630 | 176 | 4 | 0 | AS,DL,OO,UA |
| May 2025 | 636 | 146 | 3 | 0 | AS,DL,OO,UA |
| Apr 2025 | 539 | 116 | 2 | 0 | DL,OO,UA,AS |
| Mar 2025 | 560 | 148 | 3 | 0 | AS,DL,OO,UA |
| Feb 2025 | 484 | 137 | 10 | 1 | AS,DL,OO,UA |
| Jan 2025 | 523 | 67 | 2 | 0 | AS,DL,OO,UA |
| Dec 2024 | 532 | 145 | 2 | 0 | AS,DL,OO,UA |
| Nov 2024 | 548 | 124 | 6 | 0 | OO,UA,AS,DL |
| Oct 2024 | 611 | 119 | 3 | 0 | UA,AS,OO,DL |
| Sep 2024 | 617 | 170 | 5 | 0 | OO,UA,AS,DL |
| Aug 2024 | 627 | 216 | 8 | 1 | AS,DL,OO,UA |
| Jul 2024 | 624 | 152 | 18 | 0 | AS,DL,OO,UA |
| Jun 2024 | 523 | 199 | 3 | 0 | AS,DL,OO,UA |
| May 2024 | 545 | 244 | 3 | 0 | AS,DL,OO,UA |
| Apr 2024 | 517 | 258 | 1 | 0 | AS,DL,OO,UA |
| Mar 2024 | 523 | 245 | 0 | 0 | AS,DL,OO,UA |
| Feb 2024 | 445 | 187 | 5 | 0 | AS,DL,OO,UA |
| Jan 2024 | 487 | 128 | 32 | 0 | AS,DL,OO,UA |
Cancellation Rate
1.1%
154 of 13,522 flights
Diversion Rate
0.0%
5 of 13,522 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SEA - Seattle
Full on-time, delay-cause, and seasonal performance for Seattle, WA.
Origin airport →SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
Destination airport →Compare the two airports
See SEA and SFO side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to SEA–SFO.
Routes with a similar on-time rate
What the Data Says About SEA to SFO
37,651 tracked flights put the SEA to SFO pairing (Seattle to San Francisco) at a 79.1% on-time rate, squarely in line with the wider network. Delays that do occur run 61.9 minutes on average. Across the 679-mile route and its 26 carriers, the trailing 24 months show 1.1% cancelled and 0.0% diverted (13,522 flights sampled).
The monthly split is wide on this route: Jan 2025 posted the strongest performance at 87% on-time, while Apr 2024 came in at just 50% - a 37-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from SEA to SFO? ▼
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Flight Guides
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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.