Buffalo Niagara International ⇄ Denver International BUF–DEN
Airlines flew 1,175 flights between Buffalo Niagara International BUF in Buffalo, NY and Denver International DEN in Denver, CO in the twelve months to July 2026, both directions together: 171,640 passengers in 203,240 seats, 84% of them filled, and 52,607 pounds of freight. 1,359 miles, about 189 minutes in the air, on 5 airlines: United Air Lines Inc. (588), Southwest Airlines Co. (514), Frontier Airlines Inc. (70), Delta Air Lines Inc. (2) and 1 more. 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 | 28 |
| 2/25 | 38 |
| 3/25 | 57 |
| 4/25 | 60 |
| 5/25 | 88 |
| 6/25 | 156 |
| 7/25 | 167 |
| 8/25 | 161 |
| 9/25 | 154 |
| 10/25 | 141 |
| 11/25 | 104 |
| 12/25 | 39 |
| 1/26 | 30 |
| 2/26 | 73 |
| 3/26 | 66 |
| 4/26 | 66 |
| 5/26 | 72 |
| 6/26 | 130 |
| 7/26 | 139 |
Passengers by month
By month, as a table
| passengers | |
|---|---|
| 1/25 | 3,246 |
| 2/25 | 3,709 |
| 3/25 | 5,564 |
| 4/25 | 7,171 |
| 5/25 | 12,674 |
| 6/25 | 21,805 |
| 7/25 | 25,111 |
| 8/25 | 25,418 |
| 9/25 | 23,344 |
| 10/25 | 21,418 |
| 11/25 | 13,375 |
| 12/25 | 5,565 |
| 1/26 | 4,304 |
| 2/26 | 9,081 |
| 3/26 | 8,953 |
| 4/26 | 8,774 |
| 5/26 | 9,828 |
| 6/26 | 19,661 |
| 7/26 | 21,919 |
The airlines twelve months, both directions
| Airline | Flights | Passengers | Seats filled | Service |
|---|---|---|---|---|
| United Air Lines Inc. UA | 588 | 81,016 | 82% | scheduled passenger service |
| Southwest Airlines Co. WN | 514 | 77,096 | 88% | scheduled passenger service |
| Frontier Airlines Inc. F9 | 70 | 13,169 | 82% | scheduled passenger service |
| Delta Air Lines Inc. DL | 2 | 309 | 55% | charter passenger service |
| Air Canada AC | 1 | 50 | 71% | charter passenger service |
The aircraft as the airlines report their types
| Aircraft | Flights | Seats a flight | Passengers |
|---|---|---|---|
| Boeing 737-800 | 636 | 168 | 90,038 |
| Boeing B737 Max 800 | 302 | 175 | 46,130 |
| Boeing 737-700/700LR/Max 7 | 55 | 139 | 6,475 |
| Boeing B737 Max 900 | 49 | 179 | 6,822 |
| Boeing 737-900ER | 49 | 179 | 7,270 |
| Airbus Industrie A321-200n | 44 | 240 | 8,339 |
| Airbus Industrie A321Neoxlr | 14 | 230 | 2,767 |
| Airbus Industrie A320-200n | 12 | 186 | 2,063 |
| Airbus Industrie A320-100/200 | 7 | 139 | 847 |
| Airbus Industrie A319 | 4 | 126 | 404 |
| Airbus Industrie A330-900 | 2 | 281 | 309 |
| Boeing 757-200 | 1 | 176 | 176 |
BUF → DEN this direction alone · flown January 2025 to July 2026
586 flights of 586 scheduled, 88,459 passengers in 101,630 seats, 27,558 pounds of freight. United Air Lines Inc. 293; Southwest Airlines Co. 257; Frontier Airlines Inc. 35; Delta Air Lines Inc. 1.
DEN → BUF this direction alone · flown January 2025 to July 2026
589 flights of 587 scheduled, 83,181 passengers in 101,610 seats, 25,049 pounds of freight. United Air Lines Inc. 295; Southwest Airlines Co. 257; Frontier Airlines Inc. 35; Air Canada 1; Delta Air Lines Inc. 1.
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: Buffalo Niagara International BUF and Denver International DEN; all routes.