Route
DEN → IAD
Denver International Airport Washington Dulles International Airport
How punctual is this route?
- On-time arrivals
- 81.8%
- Less than 15 minutes late
- Cancelled
- 0.6%
- Of scheduled flights
- Average delay when late
- 66 min
- Flights arriving 15+ minutes late
- Flights tracked
- 3,385
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 45%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 22%
- Extreme weather 1%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 79.1% | 292 |
| October 2025 | 85.2% | 283 |
| November 2025 | 87.2% | 275 |
| December 2025 | 85.2% | 307 |
| January 2026 | 89.2% | 279 |
| February 2026 | 84.4% | 257 |
| March 2026 | 75.5% | 300 |
| April 2026 | 88.3% | 291 |
| May 2026 | 80.4% | 316 |
| June 2026 | 80.2% | 262 |
| July 2026 | 70.5% | 266 |
| August 2026 | 76.4% | 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 | 2,790 | 84.8% | 0.5% | 72 min |
| Southwest Airlines | 595 | 67.7% | 1.0% | 52 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
UA2408
28% late · 363 flights
-
UA1924
6% late · 341 flights
-
UA2087
19% late · 341 flights
-
UA347
13% late · 325 flights
-
UA1101
6% late · 323 flights
-
UA798
12% late · 245 flights
-
UA1279
7% late · 199 flights
-
UA2853
21% late · 179 flights
-
UA421
30% late · 103 flights
-
WN1762
17% late · 60 flights
-
WN1884
34% late · 58 flights
-
WN1009
53% late · 57 flights
-
WN2135
25% late · 55 flights
-
UA1379
17% late · 53 flights
-
WN4330
14% late · 50 flights
-
WN3567
22% late · 46 flights
-
UA687
11% late · 45 flights
-
UA237
17% late · 37 flights
-
WN3758
53% late · 33 flights
-
UA1877
9% late · 32 flights
-
WN1869
35% late · 31 flights
-
WN2491
55% late · 31 flights
-
WN2474
18% late · 30 flights
-
UA1412
39% late · 28 flights
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