Route
SFO → BOS
San Francisco International Airport Boston Logan International Airport
Alerts at SFO and BOS
How punctual is this route?
- On-time arrivals
- 74.5%
- Less than 15 minutes late
- Cancelled
- 1.8%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 4,815
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 40%
- Late-arriving aircraft 35%
- Airline (crew, maintenance, cleaning) 23%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.1% | 408 |
| October 2025 | 71.1% | 428 |
| November 2025 | 78.5% | 360 |
| December 2025 | 81.6% | 356 |
| January 2026 | 81.8% | 313 |
| February 2026 | 84.6% | 283 |
| March 2026 | 78.2% | 323 |
| April 2026 | 76.8% | 381 |
| May 2026 | 75.4% | 439 |
| June 2026 | 68.9% | 502 |
| July 2026 | 67.1% | 509 |
| August 2026 | 70.4% | 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 | 1,939 | 78.5% | 1.1% | 76 min |
| JetBlue Airways | 1,806 | 71.5% | 2.8% | 81 min |
| Delta Air Lines | 946 | 71.5% | 1.6% | 73 min |
| Alaska Airlines | 123 | 80.3% | 0.8% | 66 min |
| Southwest Airlines | 1 | 0.0% | 0.0% | 49 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
DL400
12% late · 364 flights
-
B6734
26% late · 346 flights
-
UA1665
16% late · 343 flights
-
B61734
34% late · 342 flights
-
UA1372
26% late · 340 flights
-
UA2647
18% late · 335 flights
-
UA2356
37% late · 328 flights
-
B6434
15% late · 327 flights
-
DL977
43% late · 230 flights
-
UA796
15% late · 196 flights
-
DL1655
31% late · 171 flights
-
B6334
22% late · 157 flights
-
B6134
37% late · 143 flights
-
B61034
39% late · 122 flights
-
B61634
39% late · 119 flights
-
DL362
33% late · 108 flights
-
UA2001
13% late · 104 flights
-
B6834
31% late · 98 flights
-
B61534
37% late · 85 flights
-
UA1015
6% late · 83 flights
-
AS356
13% late · 68 flights
-
DL860
61% late · 63 flights
-
B6934
22% late · 40 flights
-
UA2256
14% late · 37 flights
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