Route
IAH → IAD
George Bush Intercontinental Airport Washington Dulles International Airport
How punctual is this route?
- On-time arrivals
- 82.4%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 69 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,860
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 32%
- Airline (crew, maintenance, cleaning) 31%
- Late-arriving aircraft 31%
- Extreme weather 6%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 92.7% | 193 |
| October 2025 | 85.0% | 180 |
| November 2025 | 81.1% | 148 |
| December 2025 | 85.7% | 140 |
| January 2026 | 88.8% | 129 |
| February 2026 | 80.2% | 111 |
| March 2026 | 72.0% | 145 |
| April 2026 | 89.0% | 146 |
| May 2026 | 86.1% | 166 |
| June 2026 | 72.6% | 180 |
| July 2026 | 69.8% | 159 |
| August 2026 | 84.4% | 163 |
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 | 1,860 | 82.4% | 0.4% | 69 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2366
18% late · 365 flights
-
UA1549
8% late · 364 flights
-
UA1788
17% late · 262 flights
-
UA1373
26% late · 192 flights
-
UA2237
18% late · 114 flights
-
UA2388
32% late · 103 flights
-
UA1887
19% late · 97 flights
-
UA1478
23% late · 62 flights
-
UA2775
26% late · 47 flights
-
UA1515
8% late · 37 flights
-
UA650
39% late · 36 flights
-
UA2322
23% late · 31 flights
-
UA625
6% late · 31 flights
-
UA2294
4% late · 24 flights
-
UA2352
4% late · 24 flights
-
UA2767
25% late · 24 flights
-
UA2045
4% late · 23 flights
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