Phoenix (PHX) to St. Louis (STL): On-Time Performance
Data through July 2026
The calendar drives reliability on PHX–STL. November 2024 flights landed on schedule 90% of the time, but July 2026 dropped to 63% — a gap of 27 points. Across the full period the route averages 79% on-time against a national 78%. Morning departures also hold up better than evening ones (89% vs 71%), which matters most in the rough months.
- On-time
- 79%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 6.3
- last 12 months
- Duration
- 2h 56m
- scheduled
- Distance
- 1,262 mi
Best airline from PHX to STL
4 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 87% | 6 min | 0.0% | 167 |
| Frontier Airlines | 80% | 26 min | 1.5% | 66 |
| Southwest Airlines | 80% | 11 min | 0.4% | 3,370 |
| American Airlines | 78% | 15 min | 0.5% | 1,198 |
Monthly on-time trend
Best time to fly from PHX to STL
Aim for departures around 6 a.m. (96% on-time); avoid 8 p.m. departures (57%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 76% | 16 min |
| Tuesday | 83% | 10 min |
| Wednesdaybest | 85% | 8 min |
| Thursday | 79% | 13 min |
| Friday | 79% | 12 min |
| Saturday | 80% | 13 min |
| Sunday | 75% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft49%
- Airline operations40%
- National airspace system8%
- Weather2%
- Security1%
Frequently asked questions
- How often are flights from PHX to STL delayed?
- 21% of PHX–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 12 minutes.
- Which airline is most reliable from PHX to STL?
- SkyWest Airlines has the best on-time record on this route at 87%, based on 167 flights. 4 airlines flew PHX–STL frequently enough to compare in this period.
- What is the best time of day to fly from PHX to STL?
- Departures around 6 a.m. have the best record (96% on-time), while departures around 8 p.m. have the worst (57%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PHX to STL?
- The scheduled PHX–STL flight time averages 2h 56m over 1,262 miles. Actual arrival times vary — flights on this route land 15+ minutes late 21% of the time.
- How often are PHX to STL flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from PHX to STL?
- July 2026 was the roughest month in this dataset, with only 63% of arrivals on time. The best was November 2024 at 90%. If your dates are flexible, that 27-point gap is worth planning around.
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Based on 4,833 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.