Route
BOS → SFO
Boston Logan International Airport San Francisco International Airport
Alerts at BOS and SFO
How punctual is this route?
- On-time arrivals
- 69.2%
- Less than 15 minutes late
- Cancelled
- 1.6%
- Of scheduled flights
- Average delay when late
- 70 min
- Flights arriving 15+ minutes late
- Flights tracked
- 4,817
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 41%
- Late-arriving aircraft 34%
- Airline (crew, maintenance, cleaning) 22%
- Extreme weather 3%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 81.4% | 408 |
| October 2025 | 75.5% | 429 |
| November 2025 | 75.1% | 361 |
| December 2025 | 65.0% | 357 |
| January 2026 | 72.8% | 313 |
| February 2026 | 74.7% | 282 |
| March 2026 | 76.8% | 323 |
| April 2026 | 69.9% | 381 |
| May 2026 | 68.8% | 439 |
| June 2026 | 56.5% | 502 |
| July 2026 | 63.7% | 509 |
| August 2026 | 60.7% | 513 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| United Airlines | 1,940 | 72.5% | 1.2% | 70 min |
| JetBlue Airways | 1,808 | 66.5% | 2.0% | 71 min |
| Delta Air Lines | 945 | 69.0% | 1.6% | 67 min |
| Alaska Airlines | 123 | 57.6% | 0.8% | 79 min |
| Southwest Airlines | 1 | 100.0% | 0.0% | — |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL1655
34% late · 337 flights
-
B6733
44% late · 331 flights
-
UA2400
49% late · 310 flights
-
UA2441
16% late · 304 flights
-
B6333
46% late · 270 flights
-
UA1074
22% late · 269 flights
-
DL977
20% late · 234 flights
-
B6133
16% late · 185 flights
-
UA1008
12% late · 185 flights
-
B61333
17% late · 180 flights
-
B6233
33% late · 179 flights
-
B61833
24% late · 170 flights
-
B62233
26% late · 158 flights
-
UA2279
18% late · 144 flights
-
B61633
57% late · 110 flights
-
DL362
17% late · 110 flights
-
UA1367
22% late · 103 flights
-
DL475
40% late · 99 flights
-
UA2107
46% late · 92 flights
-
DL860
52% late · 85 flights
-
UA2002
46% late · 82 flights
-
B6833
19% late · 79 flights
-
DL2919
38% late · 79 flights
-
B6413
55% late · 62 flights
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