Route
IAD → DEN
Washington Dulles International Airport Denver International Airport
How punctual is this route?
- On-time arrivals
- 83.1%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 70 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,387
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 35%
- Air traffic control & airport 34%
- Airline (crew, maintenance, cleaning) 24%
- Extreme weather 7%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 85.0% | 294 |
| October 2025 | 83.7% | 283 |
| November 2025 | 91.3% | 276 |
| December 2025 | 77.1% | 304 |
| January 2026 | 87.0% | 280 |
| February 2026 | 82.4% | 257 |
| March 2026 | 80.8% | 300 |
| April 2026 | 87.9% | 291 |
| May 2026 | 85.0% | 316 |
| June 2026 | 80.5% | 263 |
| July 2026 | 80.5% | 266 |
| August 2026 | 75.0% | 257 |
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 | 2,791 | 84.1% | 0.5% | 74 min |
| Southwest Airlines | 596 | 78.4% | 1.0% | 55 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA495
15% late · 310 flights
-
UA1587
8% late · 291 flights
-
UA599
31% late · 289 flights
-
UA1865
9% late · 180 flights
-
UA419
16% late · 164 flights
-
UA395
22% late · 159 flights
-
UA1126
21% late · 124 flights
-
UA2852
16% late · 101 flights
-
UA2667
28% late · 68 flights
-
WN2431
26% late · 60 flights
-
WN3022
22% late · 60 flights
-
WN2439
14% late · 58 flights
-
WN2440
40% late · 58 flights
-
UA2064
9% late · 56 flights
-
UA431
16% late · 56 flights
-
UA700
9% late · 55 flights
-
WN4583
15% late · 55 flights
-
UA1537
11% late · 53 flights
-
WN4531
19% late · 53 flights
-
UA2031
0% late · 47 flights
-
UA792
7% late · 47 flights
-
UA1095
8% late · 37 flights
-
UA754
6% late · 37 flights
-
UA759
8% late · 37 flights
Reviews
No reviews yet. Be the first to review this route.