DEN (Denver) to BUF (Buffalo) flights arrive on time 62% of the time. The most reliable airline on this route is Frontier Airlines at 76%. The average delay is 60 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.DEN → BUF
DEN (Denver) to BUF (Buffalo)
DEN → BUF on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
Worse
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This route is frequently delayed. About 62% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Frontier Airlines is significantly more reliable on this route at 76% on time vs Southwest Airlines at 57%.
Airline Comparison
Frontier Airlines leads at 76% on time; Southwest Airlines trails at 57%.
Accurate?
Good to know
Departing from DEN
78% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. DEN has long runway queues.
TSA is currently ~21 min. Best time: 4 AM (about 5 min).
Arriving at BUF
78% on timeWhen flights into BUF are late, the average delay is 72 minutes. Build buffer if you have ground plans.
If connecting at BUF: TSA is ~18 min right now. Allow at least 60 minutes for a domestic connection.
BUF has a 2.3% cancellation rate — keep the airline app handy for rebooking.
Flight cancelled or delayed?
Check what Frontier Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of DEN? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.