Route
BOS → SAN
Boston Logan International Airport San Diego International Airport
Alerts at BOS and SAN
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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
- 75.3%
- Less than 15 minutes late
- Cancelled
- 1.8%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,880
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 38%
- Air traffic control & airport 31%
- Airline (crew, maintenance, cleaning) 27%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 71.5% | 135 |
| October 2025 | 78.0% | 163 |
| November 2025 | 81.6% | 137 |
| December 2025 | 76.6% | 133 |
| January 2026 | 72.1% | 120 |
| February 2026 | 74.0% | 112 |
| March 2026 | 82.6% | 151 |
| April 2026 | 77.8% | 144 |
| May 2026 | 81.0% | 163 |
| June 2026 | 66.3% | 203 |
| July 2026 | 78.0% | 212 |
| August 2026 | 67.8% | 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 | 82.4% | 2.0% | 73 min |
| Alaska Airlines | 508 | 74.6% | 1.6% | 75 min |
| Delta Air Lines | 364 | 66.0% | 1.6% | 47 min |
| Southwest Airlines | 89 | 44.8% | 2.2% | 69 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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DL571
34% late · 364 flights
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AS389
31% late · 314 flights
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B6619
13% late · 263 flights
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B619
24% late · 206 flights
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B6319
26% late · 158 flights
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B6219
17% late · 154 flights
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B6919
9% late · 138 flights
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AS256
15% late · 83 flights
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AS260
20% late · 54 flights
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WN749
61% late · 36 flights
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AS1456
32% late · 29 flights
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AS539
4% late · 28 flights
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WN211
50% late · 24 flights
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