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2,332 km · Domestic

Denver (DEN) – Washington Dulles (IAD)

In July 2026, 529 flights operated between Denver and Washington Dulles (both directions), and 78.1% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January506537▲ 6.1%
February460513▲ 11.5%
March585596▲ 1.9%
April583582▼ 0.2%
May620632▲ 1.9%
June644525▼ 18.5%
July713529▼ 25.8%
August669––
September586––
October566–in progress
November549––
December608––
Year to date (Jan–Jul)4,1113,914▼ 4.8%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January82.0%87.2%▲ 6.3%
February87.6%82.8%▼ 5.5%
March87.5%75.8%▼ 13.4%
April82.3%87.8%▲ 6.7%
May80.3%83.4%▲ 3.9%
June73.9%83.0%▲ 12.3%
July71.8%78.1%▲ 8.8%
August76.5%––
September85.5%––
October87.6%–in progress
November88.3%––
December80.3%––
Year-to-date average (Jan–Jul)80.8%82.6%▲ 2.2%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January222▲ 1,000.0%
February01–
March14▲ 300.0%
April10▼ 100.0%
May20▼ 100.0%
June90▼ 100.0%
July93▼ 66.7%
August1––
September0––
October0–in progress
November2––
December3––
Year to date (Jan–Jul)2430▲ 25.0%

Airlines on this route

  1. United Airlines 77.9%
  2. Southwest Airlines 22.1%

Oct 1, 2024 – Jul 31, 2026

By direction

DEN → IAD

Scheduled flights
6,263
Flights operated
6,229
Cancelled
34 · 0.5%
On-time departures
81.6%

IAD → DEN

Scheduled flights
6,266
Flights operated
6,228
Cancelled
38 · 0.6%
On-time departures
83.2%

DEN → IAD and IAD → DEN counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 9,756 77.9% 84.7% 51
Southwest Airlines WN 2,773 22.1% 74.2% 21

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay06:00–07:00-1.8min · 812 recorded · 810 measured
Gap to highest-delay hour24.4min06:00 ↔ 19:00
Recorded flights12,529DEN–IAD

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 95.3% · 215 recorded · 213 measured · Source: the US BTS 06:00 · 95.3% · 812 recorded · 810 measured · Source: the US BTS 07:00 · 94.9% · 449 recorded · 447 measured · Source: the US BTS 08:00 · 92.2% · 1,296 recorded · 1,288 measured · Source: the US BTS 09:00 · 90.3% · 375 recorded · 372 measured · Source: the US BTS 10:00 · 84.6% · 1,247 recorded · 1,239 measured · Source: the US BTS 11:00 · 84.4% · 418 recorded · 417 measured · Source: the US BTS 12:00 · 88.7% · 777 recorded · 775 measured · Source: the US BTS 13:00 · 84.6% · 781 recorded · 777 measured · Source: the US BTS 14:00 · 81.1% · 671 recorded · 666 measured · Source: the US BTS 15:00 · 79.6% · 806 recorded · 805 measured · Source: the US BTS 16:00 · 79.5% · 660 recorded · 659 measured · Source: the US BTS 17:00 · 70.1% · 1,501 recorded · 1,488 measured · Source: the US BTS 18:00 · 65.7% · 499 recorded · 495 measured · Source: the US BTS 19:00 · 59.2% · 646 recorded · 640 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 171 recorded · 169 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 81.9% · 633 recorded · 630 measured · Source: the US BTS 23:00 · 89.4% · 569 recorded · 564 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · Fewer than 200 measured departures · 3 recorded · 3 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 5.0 min · 215 recorded · 213 measured · Source: the US BTS 06:00 · -1.8 min · 812 recorded · 810 measured · Source: the US BTS 07:00 · -0.6 min · 449 recorded · 447 measured · Source: the US BTS 08:00 · 3.7 min · 1,296 recorded · 1,288 measured · Source: the US BTS 09:00 · 3.1 min · 375 recorded · 372 measured · Source: the US BTS 10:00 · 10.1 min · 1,247 recorded · 1,239 measured · Source: the US BTS 11:00 · 7.0 min · 418 recorded · 417 measured · Source: the US BTS 12:00 · 6.3 min · 777 recorded · 775 measured · Source: the US BTS 13:00 · 9.0 min · 781 recorded · 777 measured · Source: the US BTS 14:00 · 10.5 min · 671 recorded · 666 measured · Source: the US BTS 15:00 · 12.7 min · 806 recorded · 805 measured · Source: the US BTS 16:00 · 14.9 min · 660 recorded · 659 measured · Source: the US BTS 17:00 · 21.9 min · 1,501 recorded · 1,488 measured · Source: the US BTS 18:00 · 22.2 min · 499 recorded · 495 measured · Source: the US BTS 19:00 · 22.7 min · 646 recorded · 640 measured · Source: the US BTS 20:00 · Fewer than 200 measured departures · 171 recorded · 169 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 10.5 min · 633 recorded · 630 measured · Source: the US BTS 23:00 · 3.8 min · 569 recorded · 564 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · 3 · 3 recorded · 3 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 215 · 215 recorded · 213 measured · Source: the US BTS 06:00 · 812 · 812 recorded · 810 measured · Source: the US BTS 07:00 · 449 · 449 recorded · 447 measured · Source: the US BTS 08:00 · 1,296 · 1,296 recorded · 1,288 measured · Source: the US BTS 09:00 · 375 · 375 recorded · 372 measured · Source: the US BTS 10:00 · 1,247 · 1,247 recorded · 1,239 measured · Source: the US BTS 11:00 · 418 · 418 recorded · 417 measured · Source: the US BTS 12:00 · 777 · 777 recorded · 775 measured · Source: the US BTS 13:00 · 781 · 781 recorded · 777 measured · Source: the US BTS 14:00 · 671 · 671 recorded · 666 measured · Source: the US BTS 15:00 · 806 · 806 recorded · 805 measured · Source: the US BTS 16:00 · 660 · 660 recorded · 659 measured · Source: the US BTS 17:00 · 1,501 · 1,501 recorded · 1,488 measured · Source: the US BTS 18:00 · 499 · 499 recorded · 495 measured · Source: the US BTS 19:00 · 646 · 646 recorded · 640 measured · Source: the US BTS 20:00 · 171 · 171 recorded · 169 measured · Source: the US BTS 21:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 22:00 · 633 · 633 recorded · 630 measured · Source: the US BTS 23:00 · 569 · 569 recorded · 564 measured · Source: the US BTS

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View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00Fewer than 200 measured departures—33
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:0095.3%5.0 min213215
06:0095.3%-1.8 min810812
07:0094.9%-0.6 min447449
08:0092.2%3.7 min1,2881,296
09:0090.3%3.1 min372375
10:0084.6%10.1 min1,2391,247
11:0084.4%7.0 min417418
12:0088.7%6.3 min775777
13:0084.6%9.0 min777781
14:0081.1%10.5 min666671
15:0079.6%12.7 min805806
16:0079.5%14.9 min659660
17:0070.1%21.9 min1,4881,501
18:0065.7%22.2 min495499
19:0059.2%22.7 min640646
20:00Fewer than 200 measured departures—169171
21:00No observations———
22:0081.9%10.5 min630633
23:0089.4%3.8 min564569

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 81.9% · 1,855 recorded · 1,849 measured · Source: the US BTS Tuesday · 84.3% · 1,755 recorded · 1,753 measured · Source: the US BTS Wednesday · 84.8% · 1,775 recorded · 1,766 measured · Source: the US BTS Thursday · 82.3% · 1,841 recorded · 1,837 measured · Source: the US BTS Friday · 81.9% · 1,856 recorded · 1,841 measured · Source: the US BTS Saturday · 82.4% · 1,664 recorded · 1,654 measured · Source: the US BTS Sunday · 79.3% · 1,783 recorded · 1,757 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 10.2 min · 1,855 recorded · 1,849 measured · Source: the US BTS Tuesday · 8.1 min · 1,755 recorded · 1,753 measured · Source: the US BTS Wednesday · 8.6 min · 1,775 recorded · 1,766 measured · Source: the US BTS Thursday · 11.1 min · 1,841 recorded · 1,837 measured · Source: the US BTS Friday · 12.3 min · 1,856 recorded · 1,841 measured · Source: the US BTS Saturday · 9.7 min · 1,664 recorded · 1,654 measured · Source: the US BTS Sunday · 12.4 min · 1,783 recorded · 1,757 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 1,855 · 1,855 recorded · 1,849 measured · Source: the US BTS Tuesday · 1,755 · 1,755 recorded · 1,753 measured · Source: the US BTS Wednesday · 1,775 · 1,775 recorded · 1,766 measured · Source: the US BTS Thursday · 1,841 · 1,841 recorded · 1,837 measured · Source: the US BTS Friday · 1,856 · 1,856 recorded · 1,841 measured · Source: the US BTS Saturday · 1,664 · 1,664 recorded · 1,654 measured · Source: the US BTS Sunday · 1,783 · 1,783 recorded · 1,757 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday81.9%10.2 min1,8491,855
Tuesday84.3%8.1 min1,7531,755
Wednesday84.8%8.6 min1,7661,775
Thursday82.3%11.1 min1,8371,841
Friday81.9%12.3 min1,8411,856
Saturday82.4%9.7 min1,6541,664
Sunday79.3%12.4 min1,7571,783

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 84.7% · 1,067 recorded · 1,043 measured · Source: the US BTS Feb · 85.1% · 974 recorded · 973 measured · Source: the US BTS Mar · 81.6% · 1,186 recorded · 1,181 measured · Source: the US BTS Apr · 85.1% · 1,166 recorded · 1,165 measured · Source: the US BTS May · 81.9% · 1,254 recorded · 1,252 measured · Source: the US BTS Jun · 78.0% · 1,178 recorded · 1,169 measured · Source: the US BTS Jul · 74.5% · 1,254 recorded · 1,242 measured · Source: the US BTS Aug · 76.5% · 670 recorded · 669 measured · Source: the US BTS Sep · 85.5% · 586 recorded · 586 measured · Source: the US BTS Oct · 88.0% · 928 recorded · 926 measured · Source: the US BTS Nov · 88.1% · 1,108 recorded · 1,101 measured · Source: the US BTS Dec · 81.6% · 1,158 recorded · 1,150 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 8.1 min · 1,067 recorded · 1,043 measured · Source: the US BTS Feb · 9.0 min · 974 recorded · 973 measured · Source: the US BTS Mar · 10.5 min · 1,186 recorded · 1,181 measured · Source: the US BTS Apr · 7.7 min · 1,166 recorded · 1,165 measured · Source: the US BTS May · 11.4 min · 1,254 recorded · 1,252 measured · Source: the US BTS Jun · 13.8 min · 1,178 recorded · 1,169 measured · Source: the US BTS Jul · 20.8 min · 1,254 recorded · 1,242 measured · Source: the US BTS Aug · 15.0 min · 670 recorded · 669 measured · Source: the US BTS Sep · 6.3 min · 586 recorded · 586 measured · Source: the US BTS Oct · 4.1 min · 928 recorded · 926 measured · Source: the US BTS Nov · 3.6 min · 1,108 recorded · 1,101 measured · Source: the US BTS Dec · 11.1 min · 1,158 recorded · 1,150 measured · Source: the US BTS

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Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 1,067 · 1,067 recorded · 1,043 measured · Source: the US BTS Feb · 974 · 974 recorded · 973 measured · Source: the US BTS Mar · 1,186 · 1,186 recorded · 1,181 measured · Source: the US BTS Apr · 1,166 · 1,166 recorded · 1,165 measured · Source: the US BTS May · 1,254 · 1,254 recorded · 1,252 measured · Source: the US BTS Jun · 1,178 · 1,178 recorded · 1,169 measured · Source: the US BTS Jul · 1,254 · 1,254 recorded · 1,242 measured · Source: the US BTS Aug · 670 · 670 recorded · 669 measured · Source: the US BTS Sep · 586 · 586 recorded · 586 measured · Source: the US BTS Oct · 928 · 928 recorded · 926 measured · Source: the US BTS Nov · 1,108 · 1,108 recorded · 1,101 measured · Source: the US BTS Dec · 1,158 · 1,158 recorded · 1,150 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan84.7%8.1 min1,0431,067
Feb85.1%9.0 min973974
Mar81.6%10.5 min1,1811,186
Apr85.1%7.7 min1,1651,166
May81.9%11.4 min1,2521,254
Jun78.0%13.8 min1,1691,178
Jul74.5%20.8 min1,2421,254
Aug76.5%15.0 min669670
Sep85.5%6.3 min586586
Oct88.0%4.1 min926928
Nov88.1%3.6 min1,1011,108
Dec81.6%11.1 min1,1501,158

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 81.9% 10,264
  • Delayed >15 min 17.5% 2,193
  • Cancelled 0.6% 72
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

108
108 of 108
Flight numbersBy direction DeparturesOn time
UA2408 DEN → IAD 655 77.5%
UA2087 DEN → IAD 634 84.2%
UA347 DEN → IAD 581 85.6%
UA798 DEN → IAD 568 79.2%
UA1101 DEN → IAD 562 94.8%
UA1924 DEN → IAD 468 89.4%
UA495 IAD → DEN 468 79.4%
UA1587 IAD → DEN 415 90.8%
UA419 IAD → DEN 266 87.6%
UA599 IAD → DEN 258 74.5%
UA1728 IAD → DEN 224 67.0%
UA1279 DEN → IAD 177 94.9%
UA454 IAD → DEN 177 69.7%
UA1911 DEN → IAD 169 94.1%
UA2853 DEN → IAD 161 83.2%
UA1865 IAD → DEN 149 93.3%
UA395 IAD → DEN 149 80.5%
UA471 DEN → IAD 142 97.2%
UA1537 IAD → DEN 141 87.9%
UA1926 IAD → DEN 117 91.4%
UA1366 IAD → DEN 108 94.1%
WN513 IAD → DEN 106 96.2%
WN677 DEN → IAD 104 79.8%
UA2852 IAD → DEN 101 84.2%
WN1130 IAD → DEN 97 85.6%
UA1126 IAD → DEN 93 82.8%
WN4022 DEN → IAD 93 69.9%
UA1017 IAD → DEN 89 77.3%
UA2410 IAD → DEN 82 90.2%
WN1682 IAD → DEN 76 96.1%
UA1536 DEN → IAD 73 91.8%
UA421 DEN → IAD 72 80.6%
UA284 IAD → DEN 71 83.1%
UA700 IAD → DEN 68 92.7%
UA2667 IAD → DEN 62 72.6%
WN360 DEN → IAD 61 39.0%
WN1762 DEN → IAD 60 83.3%
WN2431 IAD → DEN 60 84.5%
WN3022 IAD → DEN 60 88.3%
WN3179 IAD → DEN 60 81.4%
WN1869 DEN → IAD 58 58.6%
WN1884 DEN → IAD 58 75.9%
WN2439 IAD → DEN 58 93.1%
WN2440 IAD → DEN 58 53.5%
WN2687 DEN → IAD 58 65.5%
WN3041 IAD → DEN 58 87.9%
WN4082 IAD → DEN 58 60.3%
WN1009 DEN → IAD 57 36.8%
WN3330 IAD → DEN 57 45.6%
UA2064 IAD → DEN 56 87.0%
UA2463 IAD → DEN 56 62.5%
UA431 IAD → DEN 56 82.1%
UA1762 IAD → DEN 55 90.7%
WN2135 DEN → IAD 55 62.3%
WN4583 IAD → DEN 55 77.4%
UA1379 DEN → IAD 53 84.9%
UA1669 IAD → DEN 53 83.0%
UA1704 DEN → IAD 53 45.3%
WN4531 IAD → DEN 53 86.5%
UA1341 IAD → DEN 52 88.5%
WN2687 IAD → DEN 52 51.0%
UA1872 IAD → DEN 51 94.1%
WN2558 DEN → IAD 51 68.0%
UA1712 DEN → IAD 50 98.0%
WN2902 DEN → IAD 50 78.0%
WN4330 DEN → IAD 50 83.7%
UA1100 IAD → DEN 47 87.2%
WN3567 DEN → IAD 46 71.7%
UA687 DEN → IAD 45 91.1%
WN2947 DEN → IAD 43 83.7%
UA1236 IAD → DEN 42 73.8%
WN2036 DEN → IAD 42 59.5%
WN647 IAD → DEN 42 65.9%
UA1095 IAD → DEN 37 86.1%
UA1218 IAD → DEN 37 89.2%
UA1817 IAD → DEN 37 91.9%
UA2031 IAD → DEN 37 97.3%
UA2076 IAD → DEN 37 97.3%
UA237 DEN → IAD 37 88.9%
UA680 IAD → DEN 37 83.8%
UA754 IAD → DEN 37 91.7%
UA759 IAD → DEN 37 88.9%
UA792 IAD → DEN 37 94.6%
UA2705 IAD → DEN 36 86.1%
UA2707 IAD → DEN 36 88.9%
UA2718 IAD → DEN 36 66.7%
UA405 DEN → IAD 36 83.3%
UA726 IAD → DEN 36 88.9%
UA1453 DEN → IAD 35 45.7%
UA2035 IAD → DEN 35 97.1%
UA2768 IAD → DEN 35 100.0%
WN3023 IAD → DEN 34 79.4%
WN1168 DEN → IAD 33 54.6%
WN2173 IAD → DEN 33 33.3%
WN2262 DEN → IAD 33 81.8%
WN3339 IAD → DEN 33 100.0%
WN3758 DEN → IAD 33 34.4%
UA1256 IAD → DEN 32 96.9%
UA1877 DEN → IAD 32 87.5%
UA2236 DEN → IAD 32 84.4%
WN1956 DEN → IAD 32 93.8%
WN2467 DEN → IAD 32 84.4%
UA1071 IAD → DEN 31 90.3%
UA2325 IAD → DEN 31 90.3%
UA2349 IAD → DEN 31 90.3%
WN104 IAD → DEN 31 96.8%
WN2491 DEN → IAD 31 41.9%
WN2474 DEN → IAD 30 78.6%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 529 −25.8% 3 78.1%
June 2026 525 −18.5% 0 83.0%
May 2026 632 +1.9% 0 83.4%
April 2026 582 −0.2% 0 87.8%
March 2026 596 +1.9% 4 75.8%
February 2026 513 +11.5% 1 82.8%
January 2026 537 +6.1% 22 87.2%
December 2025 608 +12.2% 3 80.3%
November 2025 549 −0.5% 2 88.3%
October 2025 566 +57.2% 0 87.6%
September 2025 586 0 85.5%
August 2025 669 1 76.5%
July 2025 713 9 71.8%
June 2025 644 9 73.9%
May 2025 620 2 80.3%
April 2025 583 1 82.3%
March 2025 585 1 87.5%
February 2025 460 0 87.6%
January 2025 506 2 82.0%
December 2024 542 5 83.0%
November 2024 552 5 87.9%
October 2024 360 2 88.6%

How to read this chart

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