DEN (Denver) to BOS (Boston) flights arrive on time 74% of the time. The most reliable airline on this route is United Airlines at 78%. The average delay is 69 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated July 2026.DEN → BOS
DEN (Denver) to BOS (Boston)
DEN → BOS on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is delayed fairly often. About 74% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
United Airlines edges out Southwest Airlines on this route — 78% vs 67% on time.
Airline Comparison
United Airlines leads at 78% on time; Southwest Airlines trails at 67%.
Accurate?
Good to know
Departing from DEN
79% on timeExpect ~19 min sitting on the taxiway after your gate pushes back. DEN has long runway queues.
TSA is currently ~14 min. Best time: 4 AM (about 5 min).
Arriving at BOS
77% on timeWhen flights into BOS are late, the average delay is 74 minutes. Build buffer if you have ground plans.
If connecting at BOS: TSA is ~9 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 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 July 2026. Source: Bureau of Transportation Statistics.