Route · BOS → SFO · 2020–2025 BTS data
Boston to San Francisco
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), BOS to SFO (Boston to San Francisco) ranks #283 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 80.9%
- On-time
- +1.9 pts
- vs US avg
- 69 min
- Delay when late
- 21,875
- Flights
- #283 of 4927
- Corpus placement
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 |
BOS–SFO seasonal on-time pattern
Best: October (84.5%) · weakest: December (75.9%)
Strongest calendar month
October
84.5% on-time · ~353 flights/mo
Busiest calendar month
July
~357 flights/mo avg
Weakest calendar month
December
75.9% on-time · ~295 flights/mo
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.
BOS on-time profileSFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
SFO on-time profileCompare the two airports
See BOS and SFO side by side on delays, cancellations, and reliability.
Compare BOS vs SFOOrigin-hub reliability standing
Mid-pack among BOS departures
From BOS, this corridor sits with 49 other 75–85% on-time routes out of 60 tracked departures, not the hub's reliability leaders (6 at ≥85%) and not the softest ( 5 below 75%). Destination: San Francisco · fleet on-time rank #2770 of 4927.
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.
On the multi-year calendar, BOS–SFO peaks in October at 84.5% on-time while July carries the heaviest traffic (~357 flights per month) ; the softest month is December at 75.9%, a 8.6-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does BOS to SFO rank among US routes by traffic? ▼
How often are flights delayed from BOS to SFO? ▼
What is the cancellation rate for BOS to SFO? ▼
How far is the flight from BOS to SFO? ▼
When is the best time to fly from BOS to SFO? ▼
Airports on this route
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.
Using BOS–SFO data
BOS–SFO is mid-pack at 80.9% on-time; month and carrier mix move more than the corridor headline.
- Compare BOS and SFO airport profiles: delay causes and top routes differ even on the same corridor. BOS airport
- If your dates flex, October (84.5% on-time) beats December (75.9%) on this corridor. Seasonal chart
- 4 other routes post a similar 80.9% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
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.