--- title: "Buffalo (BUF) to Denver (DEN) flights: who flies it" description: "United Airlines flies Buffalo (BUF) to Denver (DEN) nonstop about 7 times a week as UA 1727, scheduled at 3h 37m. See the full timetable and who flies it on 2LNR." canonical: "https://2lnr.com/routes/buf-den" url: "https://2lnr.com/routes/buf-den.md" date_modified: "2026-10-18T05:10:47Z" --- # Buffalo to Denver (BUF-DEN): nonstop flights and who flies them United Airlines flies the BUF to DEN nonstop about 7 times a week. In the timetable below it flies as UA 1727, scheduled at 3h 37m for the 1,356 miles. Schedule last confirmed October 18, 2026. Departure times come from 2LNR's schedule data; confirm with the airline before you book. Updated October 23, 2026. See BUF to DEN on the interactive map [Get started free](https://2lnr.com/login) 7 Flights a week, 4-week average 3h 37m Scheduled flight time 1,356 mi Nonstop distance Free To get started ## Buffalo to Denver flight schedule Scheduled nonstop departures for BUF to DEN starting October 22, 2026, last checked against our schedule feed on October 18, 2026. Airlines retime and cancel flights, so confirm with the airline before you book. Scheduled nonstop departures from Buffalo (BUF) to Denver (DEN) | Date | Flight | Airline | Departs BUF | Arrives DEN | Duration | Aircraft | | :--- | :--- | :--- | :--- | :--- | :--- | :--- | | Thu, Oct 22 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md) | | Fri, Oct 23 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | | Sat, Oct 24 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | | Sun, Oct 25 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | | Mon, Oct 26 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | | Tue, Oct 27 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | | Wed, Oct 28 | UA 1727 | United Airlines | 08:45 | 10:22 | 3h 37m | Boeing 737-800 | Showing all 7 scheduled BUF to DEN departures across 7 days with service, starting October 22, 2026. Later dates are on the interactive map. Departure and arrival times are local at their own airport, so an arrival can fall on a different local date than the departure; the duration column is the true elapsed flying time. A dash means the airline hasn't filed that value in the schedule data we hold. Aircraft are the equipment the airline filed, named where the code pins down one type and shown as the family or the bare code where it doesn't. Swaps can happen up to departure. See every BUF to DEN date on the interactive map ## Aircraft on the Buffalo to Denver nonstop United Airlines flies the [Boeing 737-800](https://2lnr.com/seatmaps/ua/737-800.md) on every departure in the schedule table on this page. Each linked aircraft page shows where that airline schedules it. Airlines can swap aircraft up to departure. ## The full BUF to DEN nonstop schedule This page carries the full BUF to DEN nonstop schedule, who operates each departure and how often it runs; the reverse direction is linked below. ### See the schedule Who operates each BUF to DEN nonstop and how often it runs, from 2LNR's schedule data. ### Plan on the map See BUF to DEN on the interactive route map, with schedules, connections, and route statistics. ## Airlines flying Buffalo to Denver nonstop Carriers operating BUF to DEN nonstop in the current schedule. - [United Airlines (UA) route map](https://2lnr.com/routes/airlines/ua.md)\ [The aircraft UA flies](https://2lnr.com/seatmaps/ua.md) See BUF to DEN on the interactive map → ## Frequently asked questions about BUF to DEN **How long is the flight from Buffalo (BUF) to Denver (DEN)?** UA 1727 is scheduled at 3h 37m from Buffalo (BUF) to Denver (DEN) on every departure in the schedule table on this page. The nonstop covers about 1,356 miles, and airlines adjust scheduled times by season, so confirm with the airline before you book. **Which airlines fly nonstop from BUF to DEN?** United Airlines is currently the only airline flying BUF to DEN nonstop. 2LNR doesn't show award or upgrade space for it on BUF to DEN, so this page carries the schedule rather than a space claim. **How many flights a week are there from BUF to DEN?** About 7 nonstop flights a week run between Buffalo (BUF) and Denver (DEN) in the current schedule, operated by United Airlines. Frequency shifts by season, and the schedule table on this page shows what is scheduled next. **What time do flights from BUF to DEN depart?** In the next 7 days with service, every scheduled BUF to DEN nonstop leaves at 08:45 local time at Buffalo. The schedule table on this page lists each departure by date. **Which flights operate BUF to DEN nonstop?** United Airlines flies UA 1727 nonstop from Buffalo (BUF) to Denver (DEN), the only flight number in the schedule table on this page. The table lists each date with its departure and arrival times and aircraft. **Does 2LNR show upgrade or award space on BUF to DEN?** Not on this route: 2LNR doesn't show award or upgrade space for United Airlines on BUF to DEN. The page carries the full BUF to DEN nonstop schedule and who flies each departure, and the reverse direction is linked below. Flying the other way? See [DEN to BUF nonstop flights](https://2lnr.com/routes/den-buf.md). Award seats rather than schedules? See [award availability by airline](https://2lnr.com/awards.md). Looking beyond this route? See [every route from Buffalo (BUF)](https://2lnr.com/routes/buf.md), or [every route from Denver (DEN)](https://2lnr.com/routes/den.md). Nonstops to Denver (DEN) from other airports within 150 miles of Buffalo (BUF): - [Toronto (YYZ) to Denver (DEN)](https://2lnr.com/routes/yyz-den.md), 68 miles from BUF - [Syracuse (SYR) to Denver (DEN)](https://2lnr.com/routes/syr-den.md), 133 miles from BUF Distances are great-circle between the airports, not driving distance. - [How to plan an upgrade by route](https://2lnr.com/guides/upgrade-strategy.md) ## See the full BUF to DEN nonstop schedule Every scheduled departure on this route, with who flies it. 2LNR shows upgrade and award space by date on the carriers it tracks, the next 14 days free on every product and the full horizon on Pro. [Get started free](https://2lnr.com/login)