Route
IAD → IAH
Washington Dulles International Airport George Bush Intercontinental Airport
How punctual is this route?
- On-time arrivals
- 84.7%
- Less than 15 minutes late
- Cancelled
- 0.5%
- Of scheduled flights
- Average delay when late
- 77 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,862
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 32%
- Late-arriving aircraft 32%
- Airline (crew, maintenance, cleaning) 29%
- Extreme weather 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 92.3% | 195 |
| October 2025 | 82.2% | 180 |
| November 2025 | 86.5% | 148 |
| December 2025 | 77.7% | 139 |
| January 2026 | 89.5% | 129 |
| February 2026 | 93.8% | 112 |
| March 2026 | 84.5% | 144 |
| April 2026 | 88.4% | 146 |
| May 2026 | 83.1% | 167 |
| June 2026 | 78.0% | 180 |
| July 2026 | 78.0% | 159 |
| August 2026 | 85.7% | 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 | 1,862 | 84.7% | 0.5% | 77 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2217
28% late · 341 flights
-
UA1524
10% late · 334 flights
-
UA1535
15% late · 320 flights
-
UA2275
13% late · 91 flights
-
UA1506
7% late · 55 flights
-
UA2319
8% late · 48 flights
-
UA1935
0% late · 47 flights
-
UA1986
21% late · 47 flights
-
UA2857
28% late · 47 flights
-
UA1463
15% late · 42 flights
-
UA740
8% late · 36 flights
-
UA1907
17% late · 35 flights
-
UA2050
9% late · 35 flights
-
UA1131
9% late · 32 flights
-
UA2632
10% late · 31 flights
-
UA2648
16% late · 31 flights
-
UA2437
11% late · 27 flights
-
UA1928
0% late · 24 flights
-
UA2213
26% late · 24 flights
-
UA2474
25% late · 24 flights
-
UA1490
13% late · 23 flights
-
UA1041
10% late · 21 flights
-
UA2163
0% late · 21 flights
-
UA2851
5% late · 21 flights
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