BUF (Buffalo) to DEN (Denver) flights arrive on time 81% of the time. The most reliable airline on this route is United Airlines at 84%. The average delay is 59 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated August 2026.BUF → DEN
BUF (Buffalo) to DEN (Denver)
BUF → DEN on-time performance by month
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JanFebMarAprMayJunJulAugSepOctNovDec
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This route is on time most of the time. About 81% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
United Airlines is significantly more reliable on this route at 84% on time vs Frontier Airlines at 63%.
Airline Comparison
United Airlines leads at 84% on time; Frontier Airlines trails at 63%.
Accurate?
Good to know
Departing from BUF
77% on timeExpect ~18 min sitting on the taxiway after your gate pushes back. BUF has long runway queues.
TSA is currently ~5 min. Best time: 4 AM (about 5 min).
BUF cancels 2.1% of flights — higher than average. Have a backup plan.
Arriving at DEN
79% on timeWhen flights into DEN are late, the average delay is 69 minutes. Build buffer if you have ground plans.
If connecting at DEN: TSA is ~5 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what United Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of BUF? 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 August 2026. Source: Bureau of Transportation Statistics.