Historical on-time performance
Philadelphia to St. Louis
814 miData through Dec 2025Source: US DOT · BTS
Flights on PHL–STL arrive on time 73% of the time over the last 12 months.
On-time rate73%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.5%of scheduled flights
based on 1,327 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Southwest AirlinesOn-time77%Medianon timep9045 minCancel0.7%Flights691
- American AirlinesOn-time69%Medianon timep9080 minCancel1.5%Flights474
- PSA AirlinesOn-time71%Medianon timep9075 minCancel4.9%Flights162
Why flights run late
Delay causes
- Airline31%
- Weather6%
- Air traffic (NAS)20%
- Late aircraft43%
- 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 PHL → 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 — 91% on time.
- Mornings91% on time · p90 10 min · 989 flights
- Middays83% on time · p90 25 min · 1,152 flights
- Afternoons70% on time · p90 65 min · 441 flights
- Evenings66% on time · p90 75 min · 1,530 flights
- Overnights59% on time · p90 65 min · 230 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 73% to 82% on time.
- Tuesdays82% on time · p90 40 min · 610 flights
- Wednesdays80% on time · p90 40 min · 617 flights
- Mondays75% on time · p90 60 min · 665 flights
- Saturdays75% on time · p90 40 min · 493 flights
- Fridays74% on time · p90 55 min · 657 flights
- Thursdays74% on time · p90 45 min · 638 flights
- Sundays73% on time · p90 50 min · 662 flights
Advertisement
Keep exploring