Route
SAT → IAD
San Antonio International Airport Washington Dulles International Airport
1,362 miles
Return route IAD → SAT →
How punctual is this route?
- On-time arrivals
- 93.2%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 108 min
- Flights arriving 15+ minutes late
- Flights tracked
- 644
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 52%
- Late-arriving aircraft 26%
- Air traffic control & airport 20%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 94.1% | 51 |
| October 2025 | 94.4% | 55 |
| November 2025 | 95.0% | 60 |
| December 2025 | 91.4% | 58 |
| January 2026 | 89.1% | 48 |
| February 2026 | 95.6% | 46 |
| March 2026 | 91.1% | 57 |
| April 2026 | 98.0% | 51 |
| May 2026 | 98.0% | 50 |
| June 2026 | 92.9% | 56 |
| July 2026 | 87.9% | 58 |
| August 2026 | 92.5% | 54 |
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 | 644 | 93.2% | 0.6% | 108 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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