Historical on-time performance
Denver to Boston
Flights on DEN–BOS arrive on time 71% of the time over the last 12 months.
based on 3,883 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-time76%Medianon timep9055 minCancel0.8%Flights1,916
- Delta Air LinesOn-time74%Medianon timep9050 minCancel1.3%Flights387
- JetBlue AirwaysOn-time69%Medianon timep9075 minCancel1.9%Flights675
- Southwest AirlinesOn-time59%Median5 minp9085 minCancel1.1%Flights905
Why flights run late
Delay causes
- Airline20%
- Weather1%
- Air traffic (NAS)43%
- Late aircraft37%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline11%
- Weather80%
- Air traffic (NAS)9%
- 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 DEN → BOS
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 — 80% on time.
- Mornings80% on time · p90 35 min · 2,701 flights
- Overnights76% on time · p90 55 min · 1,748 flights
- Middays68% on time · p90 65 min · 3,344 flights
- Afternoons63% on time · p90 95 min · 1,390 flights
- Evenings61% on time · p90 75 min · 2,080 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 75% on time.
- Saturdays75% on time · p90 50 min · 1,443 flights
- Wednesdays74% on time · p90 55 min · 1,589 flights
- Tuesdays72% on time · p90 60 min · 1,517 flights
- Sundays69% on time · p90 60 min · 1,678 flights
- Thursdays67% on time · p90 70 min · 1,688 flights
- Mondays67% on time · p90 70 min · 1,684 flights
- Fridays67% on time · p90 70 min · 1,712 flights
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