Historical on-time performance
Phoenix to St. Louis
1,262 miData through Dec 2025Source: US DOT · BTS
Flights on PHX–STL arrive on time 81% of the time over the last 12 months.
On-time rate81%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.7%of scheduled flights
based on 2,032 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.
- American AirlinesOn-time82%Medianon timep9035 minCancel0.6%Flights468
- Southwest AirlinesOn-time81%Medianon timep9030 minCancel0.8%Flights1,564
Why flights run late
Delay causes
- Airline37%
- Weather3%
- Air traffic (NAS)9%
- Late aircraft50%
- Security1%
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 PHX → 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 — 92% on time.
- Mornings92% on time · p90 10 min · 2,168 flights
- Middays81% on time · p90 25 min · 1,404 flights
- Evenings74% on time · p90 45 min · 1,687 flights
- Afternoons71% on time · p90 45 min · 834 flights
- Overnights58% on time · p90 70 min · 449 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 84% on time.
- Wednesdays84% on time · p90 25 min · 923 flights
- Tuesdays81% on time · p90 25 min · 906 flights
- Saturdays81% on time · p90 30 min · 809 flights
- Thursdays79% on time · p90 40 min · 950 flights
- Fridays79% on time · p90 35 min · 983 flights
- Mondays78% on time · p90 35 min · 995 flights
- Sundays77% on time · p90 35 min · 981 flights
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