Historical on-time performance
Raleigh-durham to Denver
1,437 miData through May 2026Source: US DOT · BTS
Flights on RDU–DEN arrive on time 79% of the time over the last 12 months.
On-time rate79%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.9%of scheduled flights
based on 1,546 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Frontier AirlinesOn-time90%Medianon timep90on timeCancel3.2%Flights31
- United AirlinesbestOn-time85%Medianon timep9025 minCancel0.7%Flights806
- Southwest AirlinesOn-time73%Medianon timep9050 minCancel1.0%Flights709
Why flights run late
Delay causes
- Airline21%
- Weather2%
- Air traffic (NAS)33%
- Late aircraft43%
- Security1%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline21%
- Weather71%
- Air traffic (NAS)7%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 14 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 RDU → 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 — 89% on time.
- Mornings89% on time · p90 15 min · 2,468 flights
- Middays85% on time · p90 20 min · 530 flights
- Afternoons76% on time · p90 45 min · 1,293 flights
- Overnights73% on time · p90 60 min · 303 flights
- Evenings63% on time · p90 70 min · 1,182 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 83% on time.
- Wednesdays83% on time · p90 25 min · 785 flights
- Sundays82% on time · p90 30 min · 846 flights
- Tuesdays81% on time · p90 35 min · 800 flights
- Saturdays79% on time · p90 35 min · 772 flights
- Mondays78% on time · p90 40 min · 855 flights
- Thursdays78% on time · p90 40 min · 858 flights
- Fridays76% on time · p90 55 min · 860 flights
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