Route guide

Denver to Buffalo (DEN-BUF): Nonstop Upgrade & Award Space

United Airlines and Southwest Airlines fly the DEN to BUF nonstop about 8 times a week. That's enough service to give you a real choice of departures, though premium seats don't sit unclaimed for long. 2LNR watches every DEN to BUF departure for confirmed upgrade and award space and can alert you when a date you're tracking opens up.

Data current as of July 21, 2026, refreshed on an ongoing basis as new schedules and seats are confirmed.

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8
Nonstop flights a week
1,356 mi
Nonstop distance
Free
To get started

Confirmed upgrade & award space on every DEN to BUF departure

2LNR tracks confirmed upgrade and award availability on American, Delta, and Alaska and across 30 airlines, segment by segment, date by date. Open the calendar for Denver to Buffalo to see which departures have real space, or watch the route and get alerted when space opens.

See real availability

Confirmed upgrade and award seats on each DEN to BUF departure, checked against live inventory so you know what is open before you book.

Set an alert

Premium inventory turns over fast. Watch this route and 2LNR notifies you when space appears on a date you are tracking.

Plan on the map

See DEN to BUF on the interactive route map, with schedules, connections, and route statistics.

Airlines flying Denver to Buffalo nonstop

Carriers operating DEN to BUF nonstop in the current schedule. 2LNR tracks confirmed upgrade and award space on each of them.

  • United Airlines
  • Southwest Airlines
See DEN to BUF on the interactive map →

Frequently asked questions about DEN to BUF

How far is Buffalo from Denver?
DEN to BUF covers about 1,356 miles nonstop. Flight times vary by aircraft and season; each scheduled departure on this page lists its own times.
Which airlines fly nonstop from DEN to BUF?
United Airlines and Southwest Airlines fly the route nonstop. 2LNR tracks confirmed upgrade and award space on both of them.
How many flights a week are there from DEN to BUF?
About 8 nonstop flights a week run between Denver and Buffalo in the current schedule, operated by United Airlines and Southwest Airlines. Frequency shifts by season; the calendar on this page reflects what's currently scheduled.
How do I check upgrade or award availability on DEN to BUF?
Open the DEN to BUF calendar on this page to see confirmed upgrade and award space by date. You can also set an alert on the Denver to Buffalo route, and 2LNR will notify you when space opens. It's free to start.

Never miss DEN to BUF upgrade or award space

Track confirmed availability, set alerts, and book with confidence. Free to start, no credit card required.

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