Route · SFO → BOS · 2020–2025 BTS data
San Francisco to Boston
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SFO to BOS (San Francisco to Boston) ranks #284 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 81.9%
- On-time
- +2.9 pts
- vs US avg
- 73 min
- Delay when late
- 21,869
- Flights
- #284 of 4927
- Corpus placement
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 |
SFO–BOS seasonal on-time pattern
Best: November (87.0%) · weakest: June (76.9%)
Strongest calendar month
November
87.0% on-time · ~299 flights/mo
Busiest calendar month
July
~357 flights/mo avg
Weakest calendar month
June
76.9% on-time · ~311 flights/mo
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.
SFO on-time profileBOS - Boston
Full on-time, delay-cause, and seasonal performance for Boston, MA.
BOS on-time profileCompare the two airports
See SFO and BOS side by side on delays, cancellations, and reliability.
Compare SFO vs BOSOrigin-hub reliability standing
Mid-pack among SFO departures
From SFO, this corridor sits with 50 other 75–85% on-time routes out of 73 tracked departures, not the hub's reliability leaders (20 at ≥85%) and not the softest ( 3 below 75%). Destination: Boston · fleet on-time rank #2420 of 4927.
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.
On the multi-year calendar, SFO–BOS peaks in November at 87.0% on-time while July carries the heaviest traffic (~357 flights per month) ; the softest month is June at 76.9%, a 10.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SFO to BOS rank among US routes by traffic? ▼
How often are flights delayed from SFO to BOS? ▼
What is the cancellation rate for SFO to BOS? ▼
How far is the flight from SFO to BOS? ▼
When is the best time to fly from SFO to BOS? ▼
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 SFO–BOS data
SFO–BOS is mid-pack at 81.9% on-time; month and carrier mix move more than the corridor headline.
- Compare SFO and BOS airport profiles: delay causes and top routes differ even on the same corridor. SFO airport
- If your dates flex, November (87.0% on-time) beats June (76.9%) on this corridor. Seasonal chart
- 4 other routes post a similar 81.9% 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.