Historical on-time performance
Boston to Denver
Flights on BOS–DEN arrive on time 75% of the time over the last 12 months.
based on 3,881 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- United AirlinesOn-time81%Medianon timep9030 minCancel1.0%Flights1,913
- Delta Air LinesOn-time77%Medianon timep9035 minCancel1.3%Flights387
- JetBlue AirwaysOn-time71%Medianon timep9060 minCancel1.6%Flights674
- Southwest AirlinesOn-time65%Medianon timep9060 minCancel0.9%Flights907
Why flights run late
Delay causes
- Airline25%
- Weather3%
- Air traffic (NAS)28%
- Late aircraft44%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline20%
- Weather68%
- Air traffic (NAS)11%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 44 cancellations with a reported cause (BTS reports causes from June 2003).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly BOS → DEN
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
Mornings are the most reliable time of day to fly this route — 86% on time.
- Mornings86% on time · p90 20 min · 4,639 flights
- Middays84% on time · p90 20 min · 2,014 flights
- Afternoons73% on time · p90 45 min · 2,610 flights
- Overnights62% on time · p90 80 min · 941 flights
- Evenings54% on time · p90 85 min · 1,151 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 74% to 81% on time.
- Wednesdays81% on time · p90 30 min · 1,598 flights
- Tuesdays80% on time · p90 35 min · 1,493 flights
- Mondays78% on time · p90 40 min · 1,700 flights
- Saturdays78% on time · p90 35 min · 1,456 flights
- Thursdays76% on time · p90 45 min · 1,711 flights
- Sundays76% on time · p90 40 min · 1,664 flights
- Fridays74% on time · p90 55 min · 1,733 flights
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