Route
IAD → ORD
Washington Dulles International Airport Chicago O'Hare International Airport
How punctual is this route?
- On-time arrivals
- 74.7%
- Less than 15 minutes late
- Cancelled
- 0.9%
- Of scheduled flights
- Average delay when late
- 84 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,106
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 59%
- Late-arriving aircraft 20%
- Airline (crew, maintenance, cleaning) 18%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 78.8% | 203 |
| October 2025 | 72.7% | 176 |
| November 2025 | 77.7% | 151 |
| December 2025 | 75.3% | 146 |
| January 2026 | 72.8% | 129 |
| February 2026 | 75.0% | 112 |
| March 2026 | 77.5% | 148 |
| April 2026 | 75.7% | 181 |
| May 2026 | 76.9% | 217 |
| June 2026 | 79.4% | 210 |
| July 2026 | 66.5% | 216 |
| August 2026 | 69.6% | 217 |
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 | 2,106 | 74.7% | 0.9% | 84 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2331
20% late · 365 flights
-
UA2497
53% late · 365 flights
-
UA1775
16% late · 341 flights
-
UA1738
22% late · 339 flights
-
UA1252
8% late · 156 flights
-
UA2649
36% late · 56 flights
-
UA1778
4% late · 55 flights
-
UA2304
60% late · 50 flights
-
UA279
12% late · 50 flights
-
UA1393
39% late · 47 flights
-
UA2070
15% late · 47 flights
-
UA708
14% late · 36 flights
-
UA2748
10% late · 31 flights
-
UA2056
4% late · 24 flights
-
UA2401
8% late · 24 flights
-
UA1898
17% late · 23 flights
-
UA1555
5% late · 21 flights
-
UA1580
48% late · 21 flights
-
UA421
33% late · 21 flights
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