Route
SAN → BOS
San Diego International Airport Boston Logan International Airport
Alerts at SAN and BOS
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Watch Ground Delay Program SAN
Ground Delay Program at San Diego International Airport (SAN): Average 37 minutes, up to 1 hour and 11 minutes
Reason: airport volume
Airport status
How punctual is this route?
- On-time arrivals
- 75.5%
- Less than 15 minutes late
- Cancelled
- 1.7%
- Of scheduled flights
- Average delay when late
- 88 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,881
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 36%
- Air traffic control & airport 30%
- Airline (crew, maintenance, cleaning) 26%
- Extreme weather 8%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.7% | 135 |
| October 2025 | 75.8% | 163 |
| November 2025 | 78.5% | 137 |
| December 2025 | 76.0% | 134 |
| January 2026 | 82.3% | 119 |
| February 2026 | 75.0% | 112 |
| March 2026 | 72.8% | 151 |
| April 2026 | 76.9% | 144 |
| May 2026 | 90.2% | 164 |
| June 2026 | 78.2% | 203 |
| July 2026 | 64.2% | 212 |
| August 2026 | 69.1% | 207 |
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 |
|---|---|---|---|---|
| JetBlue Airways | 919 | 76.6% | 2.1% | 95 min |
| Alaska Airlines | 509 | 78.3% | 1.4% | 77 min |
| Delta Air Lines | 364 | 78.2% | 1.6% | 96 min |
| Southwest Airlines | 89 | 38.2% | 0.0% | 74 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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B62120
18% late · 364 flights
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AS390
23% late · 358 flights
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B6620
25% late · 265 flights
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DL571
20% late · 162 flights
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B6220
32% late · 154 flights
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B6920
26% late · 136 flights
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AS255
17% late · 105 flights
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WN4930
68% late · 60 flights
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DL1358
17% late · 52 flights
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DL825
39% late · 36 flights
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DL2298
34% late · 34 flights
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DL476
21% late · 34 flights
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AS259
11% late · 30 flights
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WN3706
46% late · 28 flights
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DL561
17% late · 24 flights
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DL402
9% late · 22 flights
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