Historical on-time performance
Philadelphia to St. Louis
813 miData through May 2026Source: US DOT · BTS
Flights on PHL–STL arrive on time 74% of the time over the last 12 months.
On-time rate74%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled0.8%of scheduled flights
based on 1,310 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Southwest AirlinesbestOn-time77%Medianon timep9040 minCancel0.1%Flights696
- American AirlinesOn-time71%Medianon timep9070 minCancel1.0%Flights578
- PSA AirlinesOn-time67%Medianon timep9070 minCancel8.3%Flights36
Why flights run late
Delay causes
- Airline29%
- Weather5%
- Air traffic (NAS)19%
- Late aircraft47%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline0%
- Weather90%
- Air traffic (NAS)10%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 10 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 PHL → STL
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 — 90% on time.
- Mornings90% on time · p90 10 min · 1,090 flights
- Middays81% on time · p90 30 min · 1,086 flights
- Afternoons72% on time · p90 60 min · 487 flights
- Evenings65% on time · p90 75 min · 1,490 flights
- Overnights63% on time · p90 70 min · 330 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 81% on time.
- Tuesdays81% on time · p90 40 min · 624 flights
- Wednesdays80% on time · p90 40 min · 630 flights
- Saturdays76% on time · p90 40 min · 507 flights
- Fridays74% on time · p90 45 min · 690 flights
- Mondays74% on time · p90 65 min · 689 flights
- Sundays73% on time · p90 50 min · 673 flights
- Thursdays73% on time · p90 50 min · 670 flights
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