PlainFlights

Route · DEN → IAD · 2020–2025 BTS data

Denver to Washington

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), DEN to IAD (Denver to Washington) ranks #456 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

79.1%
On-time
+0.1 pts
vs US avg
68 min
Delay when late
17,394
Flights
#456 of 4927
Corpus placement

Cancelled

1.1%

Best Month

Nov 2025 87%

Worst Month

Jul 2025 65%

Distance

1,452 mi

Carriers

2

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 307 45 2 0 WN,UA
Nov 2025 275 35 1 0 UA,WN
Oct 2025 283 42 0 0 UA,WN
Sep 2025 292 61 0 0 UA,WN
Aug 2025 335 96 0 0 WN,UA
Jul 2025 361 125 4 7 UA,WN
Jun 2025 326 108 6 3 UA,WN
May 2025 311 86 1 0 UA,WN
Apr 2025 292 61 0 0 UA,WN
Mar 2025 293 44 0 1 UA,WN
Feb 2025 230 34 0 0 UA,WN
Jan 2025 254 51 1 0 UA,WN
Dec 2024 274 36 2 0 UA,WN
Nov 2024 278 40 3 0 UA,WN
Oct 2024 283 37 0 0 UA,WN
Sep 2024 286 43 2 1 WN,UA
Aug 2024 296 73 2 1 WN,UA
Jul 2024 302 78 4 0 UA,WN
Jun 2024 290 71 3 0 UA,WN
May 2024 301 90 3 0 UA,WN
Apr 2024 262 58 1 0 UA,WN
Mar 2024 253 62 1 0 UA,WN
Feb 2024 201 47 0 1 UA,WN
Jan 2024 221 61 41 0 WN,UA

DEN–IAD seasonal on-time pattern

Best: November (84.6%) · weakest: July (70.8%)

70%75%80%85%90% JanFebMarAprMayJunJulAugSepOctNovDec 81.6%

Strongest calendar month

November

84.6% on-time · ~237 flights/mo

Busiest calendar month

August

~273 flights/mo avg

Weakest calendar month

July

70.8% on-time · ~265 flights/mo

Cancellation Rate

1.1%

77 of 6,806 flights

Diversion Rate

0.2%

14 of 6,806 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

DEN - Denver

Full on-time, delay-cause, and seasonal performance for Denver, CO.

DEN on-time profile

IAD - Washington

Full on-time, delay-cause, and seasonal performance for Washington, DC.

IAD on-time profile

Compare the two airports

See DEN and IAD side by side on delays, cancellations, and reliability.

Compare DEN vs IAD

Origin-hub reliability standing

Mid-pack among DEN departures

From DEN, this corridor sits with 133 other 75–85% on-time routes out of 168 tracked departures, not the hub's reliability leaders (8 at ≥85%) and not the softest ( 27 below 75%). Destination: Washington · fleet on-time rank #3480 of 4927.

What the Data Says About DEN to IAD

17,394 tracked flights put the DEN to IAD pairing (Denver to Washington) at a 79.1% on-time rate, squarely in line with the wider network. Delays that do occur run 68.0 minutes on average. Across the 1,452-mile route and its 2 carriers, the trailing 24 months show 1.1% cancelled and 0.2% diverted (6,806 flights sampled).

The monthly split is wide on this route: Nov 2025 posted the strongest performance at 87% on-time, while Jul 2025 came in at just 65% - a 22-point swing worth factoring into travel timing.

On the multi-year calendar, DEN–IAD peaks in November at 84.6% on-time while August carries the heaviest traffic (~273 flights per month) ; the softest month is July at 70.8%, a 13.8-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does DEN to IAD rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, DEN to IAD ranks #456 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from DEN to IAD? ▼
Flights from Denver to Washington have a 79.1% on-time rate based on 17,394 flights. The average delay is 68.0 minutes. The best recent month was Nov 2025 with 87% on-time.
What is the cancellation rate for DEN to IAD? ▼
Over the last 24 months, 1.1% of flights on this route were cancelled (77 of 6,806 flights) and 0.2% were diverted.
How far is the flight from DEN to IAD? ▼
The flight distance from Denver (DEN) to Washington (IAD) is approximately 1,452 miles. This route is served by 2 carriers.
When is the best time to fly from DEN to IAD? ▼
The best recent month for on-time performance was Nov 2025 (87% on-time). The worst was Jul 2025 (65% on-time). Consider booking during months with historically better performance.

Airports on this route

DEN Airport

Denver
IAD Airport

Washington
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.

Using DEN–IAD data

DEN–IAD is mid-pack at 79.1% on-time; month and carrier mix move more than the corridor headline.

  • Compare DEN and IAD airport profiles: delay causes and top routes differ even on the same corridor. DEN airport
  • If your dates flex, November (84.6% on-time) beats July (70.8%) on this corridor. Seasonal chart
  • 4 other routes post a similar 79.1% on-time rate; compare before you commit to this pairing. Similar routes

On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.