Historical on-time performance
Boston to Denver
1,754 miData through Dec 2025Source: US DOT · BTS
Flights on BOS–DEN arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay45 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 3,949 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-time79%Medianon timep9040 minCancel0.2%Flights1,967
- Southwest AirlinesOn-time69%Medianon timep9065 minCancel0.3%Flights945
- Delta Air LinesOn-time75%Medianon timep9035 minCancel0.8%Flights387
- JetBlue AirwaysOn-time75%Medianon timep9040 minCancel0.8%Flights650
Why flights run late
Delay causes
- Airline22%
- Weather3%
- Air traffic (NAS)30%
- Late aircraft46%
- Security0%
Most delay minutes here are attributed to Late aircraft.
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 (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 56% to 85% on time.
- Mornings85% on time · p90 20 min · 4,606 flights
- Middays84% on time · p90 20 min · 1,986 flights
- Afternoons73% on time · p90 45 min · 2,458 flights
- Overnights62% on time · p90 80 min · 922 flights
- Evenings56% on time · p90 90 min · 1,141 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 80% on time.
- Tuesdays80% on time · p90 30 min · 1,480 flights
- Wednesdays80% on time · p90 30 min · 1,577 flights
- Mondays79% on time · p90 40 min · 1,666 flights
- Saturdays77% on time · p90 40 min · 1,433 flights
- Sundays77% on time · p90 40 min · 1,626 flights
- Thursdays76% on time · p90 45 min · 1,655 flights
- Fridays75% on time · p90 55 min · 1,676 flights
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