Route · BOS → SFO · 2020–2025 BTS data
Boston to San Francisco
The BOS–SFO corridor (Boston, MA → San Francisco, CA) runs ahead of the national average, served by 18 carriers across roughly 2,704 miles.
Data updated 2026-06-13
- 80.9%
- On-time
- +1.9 pts
- vs US avg
- 69 min
- Delay when late
- 21,875
- Flights
Cancelled
0.7%
Best Month
Jan 2025 88%
Worst Month
Apr 2024 59%
Distance
2,704 mi
Carriers
18
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 357 | 122 | 3 | 5 | DL,AS,B6,UA |
| Nov 2025 | 361 | 87 | 9 | 2 | UA,DL,AS,B6 |
| Oct 2025 | 429 | 104 | 3 | 2 | AS,B6,DL,UA |
| Sep 2025 | 408 | 76 | 0 | 0 | UA,DL,AS,B6 |
| Aug 2025 | 431 | 67 | 1 | 0 | UA,AS,B6,DL |
| Jul 2025 | 450 | 116 | 1 | 2 | AS,B6,DL,UA |
| Jun 2025 | 438 | 80 | 0 | 0 | AS,B6,DL,UA |
| May 2025 | 432 | 61 | 1 | 0 | AS,B6,DL,UA |
| Apr 2025 | 369 | 69 | 0 | 0 | DL,UA,AS,B6 |
| Mar 2025 | 327 | 61 | 0 | 1 | AS,B6,DL,UA |
| Feb 2025 | 267 | 98 | 3 | 1 | B6,DL,UA |
| Jan 2025 | 306 | 36 | 1 | 0 | AS,B6,DL,UA |
| Dec 2024 | 377 | 94 | 2 | 1 | AS,B6,DL,UA |
| Nov 2024 | 362 | 80 | 0 | 1 | UA,B6,AS,DL |
| Oct 2024 | 426 | 68 | 0 | 1 | UA,AS,DL,B6 |
| Sep 2024 | 407 | 70 | 0 | 0 | UA,AS,B6,DL |
| Aug 2024 | 427 | 132 | 4 | 1 | AS,B6,DL,UA |
| Jul 2024 | 443 | 100 | 15 | 0 | AS,B6,DL,UA |
| Jun 2024 | 394 | 136 | 5 | 2 | AS,B6,DL,UA |
| May 2024 | 397 | 135 | 1 | 2 | AS,B6,DL,UA |
| Apr 2024 | 325 | 132 | 1 | 0 | AS,B6,DL,UA |
| Mar 2024 | 325 | 98 | 1 | 2 | AS,B6,DL,UA |
| Feb 2024 | 276 | 57 | 4 | 3 | AS,B6,DL,UA |
| Jan 2024 | 287 | 63 | 10 | 1 | AS,B6,DL,UA |
Cancellation Rate
0.7%
65 of 9,021 flights
Diversion Rate
0.3%
27 of 9,021 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Origin airport →SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
Destination airport →Compare the two airports
See BOS 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 BOS–SFO.
Routes with a similar on-time rate
What the Data Says About BOS to SFO
21,875 tracked flights put the BOS to SFO pairing (Boston to San Francisco) at a 80.9% on-time rate, squarely in line with the wider network. Delays that do occur run 68.5 minutes on average. Across the 2,704-mile route and its 18 carriers, the trailing 24 months show 0.7% cancelled and 0.3% diverted (9,021 flights sampled).
The monthly split is wide on this route: Jan 2025 posted the strongest performance at 88% on-time, while Apr 2024 came in at just 59% - a 29-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.