Route · IAD → DEN · 2020–2025 BTS data
Washington to Denver
The IAD–DEN corridor (Washington, DC → Denver, CO) runs ahead of the national average, served by 2 carriers across roughly 1,452 miles.
Data updated 2026-06-13
- 83.1%
- On-time
- +4.1 pts
- vs US avg
- 72 min
- Delay when late
- 17,372
- Flights
Cancelled
0.9%
Best Month
Nov 2025 91%
Worst Month
Jul 2025 69%
Distance
1,452 mi
Carriers
2
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 304 | 69 | 1 | 2 | WN,UA |
| Nov 2025 | 276 | 24 | 1 | 0 | UA,WN |
| Oct 2025 | 283 | 46 | 0 | 0 | UA,WN |
| Sep 2025 | 294 | 44 | 0 | 1 | UA,WN |
| Aug 2025 | 335 | 78 | 1 | 6 | WN,UA |
| Jul 2025 | 361 | 111 | 5 | 8 | UA,WN |
| Jun 2025 | 327 | 86 | 3 | 3 | UA,WN |
| May 2025 | 311 | 78 | 1 | 0 | UA,WN |
| Apr 2025 | 292 | 63 | 1 | 2 | UA,WN |
| Mar 2025 | 293 | 30 | 1 | 1 | UA,WN |
| Feb 2025 | 230 | 48 | 0 | 2 | UA,WN |
| Jan 2025 | 254 | 50 | 1 | 1 | UA,WN |
| Dec 2024 | 273 | 32 | 3 | 0 | UA,WN |
| Nov 2024 | 279 | 25 | 2 | 0 | UA,WN |
| Oct 2024 | 283 | 26 | 2 | 0 | UA,WN |
| Sep 2024 | 287 | 31 | 3 | 0 | WN,UA |
| Aug 2024 | 296 | 70 | 2 | 0 | WN,UA |
| Jul 2024 | 303 | 63 | 1 | 3 | UA,WN |
| Jun 2024 | 290 | 69 | 4 | 1 | UA,WN |
| May 2024 | 301 | 84 | 3 | 1 | UA,WN |
| Apr 2024 | 262 | 56 | 3 | 0 | UA,WN |
| Mar 2024 | 253 | 27 | 1 | 0 | UA,WN |
| Feb 2024 | 201 | 34 | 0 | 0 | UA,WN |
| Jan 2024 | 221 | 47 | 25 | 0 | WN,UA |
Cancellation Rate
0.9%
64 of 6,809 flights
Diversion Rate
0.5%
31 of 6,809 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
IAD - Washington
Full on-time, delay-cause, and seasonal performance for Washington, DC.
Origin airport →DEN - Denver
Full on-time, delay-cause, and seasonal performance for Denver, CO.
Destination airport →Compare the two airports
See IAD and DEN side by side on delays, cancellations, and reliability.
Open comparison tool →Similar routes
Other BTS-tracked routes with comparable performance or trip length to IAD–DEN.
Routes with a similar on-time rate
What the Data Says About IAD to DEN
Bureau of Transportation Statistics records show Washington to Denver (IAD to DEN) running a 83.1% on-time rate over 17,372 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 71.5 minutes. The 1,452-mile corridor is served by 2 carriers, and over the last 24 months 0.9% of 6,809 flights were cancelled, 0.5% diverted.
The monthly split is wide on this route: Nov 2025 posted the strongest performance at 91% on-time, while Jul 2025 came in at just 69% - a 22-point swing worth factoring into travel timing.
Frequently Asked Questions
How often are flights delayed from IAD to DEN? ▼
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Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.