Route
IAD → SAN
Washington Dulles International Airport San Diego International Airport
Alerts at IAD 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
- 82.9%
- Less than 15 minutes late
- Cancelled
- 0.7%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,402
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 42%
- Airline (crew, maintenance, cleaning) 24%
- Late-arriving aircraft 24%
- Extreme weather 9%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.7% | 119 |
| October 2025 | 90.5% | 119 |
| November 2025 | 80.0% | 115 |
| December 2025 | 78.3% | 122 |
| January 2026 | 83.2% | 112 |
| February 2026 | 86.0% | 100 |
| March 2026 | 86.2% | 117 |
| April 2026 | 89.1% | 110 |
| May 2026 | 84.2% | 120 |
| June 2026 | 75.0% | 120 |
| July 2026 | 80.2% | 124 |
| August 2026 | 73.6% | 124 |
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 | 1,041 | 86.1% | 0.7% | 70 min |
| Alaska Airlines | 361 | 73.4% | 0.8% | 52 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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