OnTimeStats

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 Airlines
    On-time82%
    Medianon time
    p9035 min
    Cancel0.5%
    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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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.