Washington Dulles International ⇄ Denver International IAD–DEN
Airlines flew 6,911 flights between Washington Dulles International IAD in Washington, DC and Denver International DEN in Denver, CO in the twelve months to July 2026, both directions together: 1,153,371 passengers in 1,355,684 seats, 85% of them filled, and 2,811,931 pounds of freight. 1,452 miles, about 205 minutes in the air, on 4 airlines: United Air Lines Inc. (5,559), Southwest Airlines Co. (1,346), Delta Air Lines Inc. (4), SkyWest Airlines Inc. (2). Planning to fly it yourself? The weather and winds along this route right now.
Flights by month both directions
By month, as a table
| flights | |
|---|---|
| 1/25 | 509 |
| 2/25 | 462 |
| 3/25 | 586 |
| 4/25 | 584 |
| 5/25 | 624 |
| 6/25 | 644 |
| 7/25 | 704 |
| 8/25 | 667 |
| 9/25 | 588 |
| 10/25 | 568 |
| 11/25 | 550 |
| 12/25 | 610 |
| 1/26 | 542 |
| 2/26 | 517 |
| 3/26 | 595 |
| 4/26 | 582 |
| 5/26 | 633 |
| 6/26 | 525 |
| 7/26 | 534 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 88,828 |
| 2/25 | 79,637 |
| 3/25 | 104,362 |
| 4/25 | 102,374 |
| 5/25 | 114,006 |
| 6/25 | 112,865 |
| 7/25 | 116,181 |
| 8/25 | 114,386 |
| 9/25 | 102,558 |
| 10/25 | 93,152 |
| 11/25 | 86,452 |
| 12/25 | 108,586 |
| 1/26 | 83,764 |
| 2/26 | 79,926 |
| 3/26 | 95,697 |
| 4/26 | 93,723 |
| 5/26 | 104,505 |
| 6/26 | 94,494 |
| 7/26 | 96,128 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| United Air Lines Inc. UA | 5,559 | 968,491 | 86% | charter cargo service, scheduled passenger service |
| Southwest Airlines Co. WN | 1,346 | 184,637 | 80% | charter passenger service, scheduled passenger service |
| Delta Air Lines Inc. DL | 4 | 243 | 84% | charter passenger service |
| SkyWest Airlines Inc. OO | 2 | 0 | 0% | scheduled passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing 737-900ER | 2,082 | 179 | 315,327 |
| Airbus Industrie A321-200n | 1,938 | 200 | 336,595 |
| Boeing B737 Max 800 | 804 | 175 | 112,117 |
| Boeing 757-300 | 572 | 234 | 119,749 |
| Boeing B737 Max 900 | 567 | 179 | 89,691 |
| Boeing 737-800 | 440 | 175 | 60,473 |
| Boeing 777-200ER/200LR/233LR | 310 | 362 | 92,967 |
| Boeing 737-700/700LR/Max 7 | 134 | 141 | 16,529 |
| Boeing 757-200 | 43 | 166 | 6,122 |
| Boeing 767-400/ER | 8 | 231 | 1,523 |
| B787-900 Dreamliner | 4 | 257 | 853 |
| Boeing 767-300/300ER | 3 | 203 | 586 |
| Canadair RJ-200ER /RJ-440 | 2 | 50 | 0 |
| Airbus Industrie A320-100/200 | 2 | 150 | 219 |
| Boeing 787-10 Dreamliner | 2 | 318 | 620 |
IAD → DEN this direction alone · flown January 2025 to July 2026
3,443 flights of 3,467 scheduled, 573,967 passengers in 677,182 seats, 1,616,998 pounds of freight, 23,128 pounds of mail. United Air Lines Inc. 2,768; Southwest Airlines Co. 672; SkyWest Airlines Inc. 2; Delta Air Lines Inc. 1.
DEN → IAD this direction alone · flown January 2025 to July 2026
3,468 flights of 3,463 scheduled, 579,404 passengers in 678,502 seats, 1,194,933 pounds of freight, 7,392 pounds of mail. United Air Lines Inc. 2,791; Southwest Airlines Co. 674; Delta Air Lines Inc. 3.
Source: the Bureau of Transportation Statistics' T-100 Segment table (all carriers). A flight is one departure performed on this segment; seats and passengers are the airlines' own monthly reports; "seats filled" is passengers divided by seats. The miles are the DOT's great-circle distance. Both ends: Washington Dulles International IAD and Denver International DEN; all routes.