OnTimeStats

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 Airlines
    On-time85%
    Medianon time
    p9020 min
    Cancel0.8%
    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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Methodology

A flight is on time when it arrives within 15 minutes of schedule — the US DOT / BTS standard. Median and p90(the “1-in-10 bad day”) are read from the full arrival-delay distribution, never averaged across periods.

Figures cover a carrier’s own BTS-coded flights. Cells below ~200 flights are flagged as limited data. All numbers are pre-computed from public BTS On-Time Performance data.