Route
DEN → SAN
Denver International Airport San Diego International Airport
Alerts at DEN 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
- 73.8%
- Less than 15 minutes late
- Cancelled
- 0.8%
- Of scheduled flights
- Average delay when late
- 60 min
- Flights arriving 15+ minutes late
- Flights tracked
- 6,152
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 40%
- Air traffic control & airport 30%
- Airline (crew, maintenance, cleaning) 28%
- Extreme weather 1%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 72.7% | 411 |
| October 2025 | 73.4% | 532 |
| November 2025 | 79.5% | 529 |
| December 2025 | 70.7% | 538 |
| January 2026 | 81.9% | 500 |
| February 2026 | 84.1% | 460 |
| March 2026 | 82.6% | 537 |
| April 2026 | 84.0% | 508 |
| May 2026 | 77.2% | 515 |
| June 2026 | 65.0% | 525 |
| July 2026 | 64.4% | 544 |
| August 2026 | 52.4% | 553 |
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 |
|---|---|---|---|---|
| Southwest Airlines | 2,422 | 67.3% | 0.6% | 59 min |
| United Airlines | 2,067 | 77.9% | 0.3% | 63 min |
| Frontier Airlines | 701 | 80.1% | 1.4% | 70 min |
| Alaska Airlines | 557 | 82.2% | 1.1% | 58 min |
| SkyWest Airlines | 405 | 68.6% | 3.2% | 50 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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UA1940
22% late · 365 flights
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UA540
36% late · 364 flights
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UA1302
16% late · 345 flights
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UA2309
9% late · 343 flights
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UA1281
17% late · 308 flights
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F94989
26% late · 256 flights
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UA1835
33% late · 233 flights
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F92711
17% late · 171 flights
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AS1428
27% late · 161 flights
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AS1491
10% late · 152 flights
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F92817
16% late · 142 flights
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F92421
15% late · 132 flights
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OO3021
7% late · 85 flights
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OO3012
17% late · 81 flights
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AS1617
7% late · 70 flights
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AS1618
28% late · 70 flights
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OO3020
73% late · 69 flights
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WN1370
30% late · 63 flights
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WN664
18% late · 63 flights
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WN1700
25% late · 62 flights
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WN1699
13% late · 61 flights
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WN3503
56% late · 61 flights
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WN1703
82% late · 60 flights
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WN1704
49% late · 59 flights
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