Historical on-time performance
Raleigh-durham to St. Louis
667 miData through Dec 2025Source: US DOT · BTS
Flights on RDU–STL arrive on time 85% of the time over the last 12 months.
On-time rate85%arrived within 15 min
p90 delay20 min1 in 10 flights is worse (tail risk)
Cancelled0.8%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-time85%Medianon timep9020 minCancel0.8%Flights639
Why flights run late
Delay causes
- Airline24%
- Weather1%
- Air traffic (NAS)7%
- Late aircraft68%
- 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 RDU → STL
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 — 93% on time.
- Mornings93% on time · p90 5 min · 615 flights
- Middays85% on time · p90 15 min · 275 flights
- Afternoons81% on time · p90 25 min · 236 flights
- Evenings76% on time · p90 45 min · 351 flights
- Overnights68% on time · p90 50 min · 238 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 76% to 87% on time.
- Tuesdays87% on time · p90 20 min · 255 flights
- Wednesdays87% on time · p90 15 min · 254 flights
- Mondays85% on time · p90 20 min · 254 flights
- Saturdays84% on time · p90 30 min · 200 flights
- Thursdays81% on time · p90 30 min · 254 flights
- Fridays81% on time · p90 25 min · 258 flights
- Sundays76% on time · p90 45 min · 240 flights
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