Historical on-time performance
St. Louis to Atlanta
484 miData through May 2026Source: US DOT · BTS
Flights on STL–ATL arrive on time 84% of the time over the last 12 months.
On-time rate84%arrived within 15 min
p90 delay25 min1 in 10 flights is worse (tail risk)
Cancelled1.8%of scheduled flights
based on 3,565 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Delta Air LinesbestOn-time87%Medianon timep9015 minCancel2.1%Flights2,380
- Southwest AirlinesOn-time80%Medianon timep9030 minCancel1.1%Flights1,154
- Frontier AirlinesOn-time58%Median5 minp9050 minCancel3.2%Flights31
Why flights run late
Delay causes
- Airline35%
- Weather4%
- Air traffic (NAS)18%
- Late aircraft43%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline63%
- Weather35%
- Air traffic (NAS)2%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 63 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 STL → ATL
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 — 91% on time.
- Mornings91% on time · p90 5 min · 3,669 flights
- Middays86% on time · p90 20 min · 2,680 flights
- Afternoons79% on time · p90 35 min · 1,641 flights
- Evenings77% on time · p90 40 min · 2,314 flights
- Overnights67% on time · p90 60 min · 368 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 79% to 89% on time.
- Wednesdays89% on time · p90 15 min · 1,454 flights
- Tuesdays88% on time · p90 20 min · 1,451 flights
- Thursdays86% on time · p90 20 min · 1,647 flights
- Fridays84% on time · p90 25 min · 1,645 flights
- Mondays83% on time · p90 30 min · 1,636 flights
- Saturdays82% on time · p90 30 min · 1,231 flights
- Sundays79% on time · p90 40 min · 1,608 flights
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