Route · SFO → BOS · 2020–2025 BTS data
San Francisco to Boston
The SFO–BOS corridor (San Francisco, CA → Boston, MA) runs ahead of the national average, served by 19 carriers across roughly 2,704 miles.
Data updated 2026-06-13
- 81.9%
- On-time
- +2.9 pts
- vs US avg
- 73 min
- Delay when late
- 21,869
- Flights
Cancelled
0.7%
Best Month
Apr 2025 92%
Worst Month
May 2025 71%
Distance
2,704 mi
Carriers
19
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 356 | 65 | 2 | 0 | B6,DL,AS,UA |
| Nov 2025 | 360 | 75 | 10 | 1 | UA,DL,AS,B6 |
| Oct 2025 | 428 | 122 | 3 | 3 | AS,B6,DL,UA |
| Sep 2025 | 408 | 114 | 0 | 0 | UA,DL,AS,B6 |
| Aug 2025 | 431 | 65 | 1 | 1 | UA,AS,B6,DL |
| Jul 2025 | 450 | 108 | 1 | 0 | AS,B6,DL,UA |
| Jun 2025 | 438 | 82 | 0 | 0 | AS,B6,DL,UA |
| May 2025 | 433 | 126 | 0 | 0 | AS,B6,DL,UA |
| Apr 2025 | 368 | 31 | 0 | 0 | DL,UA,AS,B6 |
| Mar 2025 | 327 | 54 | 0 | 1 | AS,B6,DL,UA |
| Feb 2025 | 268 | 45 | 3 | 3 | B6,DL,UA |
| Jan 2025 | 306 | 34 | 1 | 0 | AS,B6,DL,UA |
| Dec 2024 | 375 | 84 | 2 | 1 | AS,B6,DL,UA |
| Nov 2024 | 362 | 66 | 0 | 0 | UA,B6,AS,DL |
| Oct 2024 | 427 | 47 | 0 | 1 | UA,AS,DL,B6 |
| Sep 2024 | 407 | 73 | 1 | 0 | UA,AS,B6,DL |
| Aug 2024 | 425 | 122 | 4 | 2 | AS,B6,DL,UA |
| Jul 2024 | 443 | 94 | 14 | 1 | AS,B6,DL,UA |
| Jun 2024 | 395 | 94 | 2 | 0 | AS,B6,DL,UA |
| May 2024 | 398 | 89 | 2 | 3 | AS,B6,DL,UA |
| Apr 2024 | 324 | 92 | 1 | 0 | AS,B6,DL,UA |
| Mar 2024 | 326 | 81 | 1 | 0 | AS,B6,DL,UA |
| Feb 2024 | 277 | 55 | 3 | 1 | AS,B6,DL,UA |
| Jan 2024 | 286 | 79 | 11 | 1 | AS,B6,DL,UA |
Cancellation Rate
0.7%
62 of 9,018 flights
Diversion Rate
0.2%
19 of 9,018 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 →BOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
Destination airport →Compare the two airports
See SFO and BOS 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–BOS.
Routes with a similar on-time rate
What the Data Says About SFO to BOS
21,869 tracked flights put the SFO to BOS pairing (San Francisco to Boston) at a 81.9% on-time rate, squarely in line with the wider network. Delays that do occur run 72.7 minutes on average. Across the 2,704-mile route and its 19 carriers, the trailing 24 months show 0.7% cancelled and 0.2% diverted (9,018 flights sampled).
The monthly split is wide on this route: Apr 2025 posted the strongest performance at 92% on-time, while May 2025 came in at just 71% - a 21-point swing worth factoring into travel timing.
Frequently Asked Questions
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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.