Historical on-time performance
St. Louis to Raleigh-durham
667 miData through Dec 2025Source: US DOT · BTS
Flights on STL–RDU arrive on time 82% of the time over the last 12 months.
On-time rate82%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled0.5%of scheduled flights
based on 639 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesOn-time82%Medianon timep9035 minCancel0.5%Flights639
Why flights run late
Delay causes
- Airline33%
- Weather1%
- Air traffic (NAS)6%
- Late aircraft60%
- 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 STL → RDU
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 90% on time.
- Mornings90% on time · p90 10 min · 770 flights
- Middays83% on time · p90 30 min · 132 flights · limited
- Afternoons81% on time · p90 25 min · 187 flights · limited
- Evenings80% on time · p90 35 min · 371 flights
- Overnights69% on time · p90 60 min · 258 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 75% to 88% on time.
- Wednesdays88% on time · p90 15 min · 254 flights
- Tuesdays87% on time · p90 20 min · 255 flights
- Mondays85% on time · p90 20 min · 254 flights
- Saturdays84% on time · p90 35 min · 203 flights
- Fridays83% on time · p90 25 min · 258 flights
- Thursdays81% on time · p90 35 min · 254 flights
- Sundays75% on time · p90 50 min · 240 flights
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