Phoenix (PHX) to St. Louis (STL): On-Time Performance
Data through May 2026
The calendar drives reliability on PHX–STL. November 2024 flights landed on schedule 90% of the time, but July 2024 dropped to 66% — a gap of 24 points. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (90% vs 73%), which matters most in the rough months.
- On-time
- 81%
- 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 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| SkyWest Airlinesmost reliable | 87% | 6 min | 0.0% | 167 |
| Southwest Airlines | 81% | 11 min | 0.4% | 3,248 |
| American Airlines | 79% | 15 min | 0.5% | 1,151 |
| Frontier Airlines | 79% | 29 min | 1.3% | 77 |
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 (62%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 78% | 16 min |
| Tuesday | 83% | 10 min |
| Wednesdaybest | 85% | 9 min |
| Thursday | 80% | 12 min |
| Friday | 80% | 11 min |
| Saturday | 82% | 11 min |
| Sunday | 77% | 12 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft47%
- Airline operations42%
- National airspace system9%
- Weather2%
- Security1%
Frequently asked questions
- How often are flights from PHX to STL delayed?
- 20% of PHX–STL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. 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 (62%). 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 20% of the time.
- How often are PHX to STL flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from PHX to STL?
- July 2024 was the roughest month in this dataset, with only 66% of arrivals on time. The best was November 2024 at 90%. If your dates are flexible, that 24-point gap is worth planning around.
Explore related pages
More routes from PHX
Based on 4,679 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.