STL to PHX flight delays & on-time performance
Nonstop flights from St. Louis Lambert International Airport to Phoenix Sky Harbor International Airport · 1,262 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at STL or PHX right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from St. Louis (STL) to Phoenix (PHX) arrived on time 75% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.5% were cancelled, and 8% arrived an hour or more late.
- American Airlines was the most punctual airline here (81% on time); Southwest Airlines was the least (71%).
- Departures scheduled around 5am did best (96% on time); around 9pm did worst (47%).
- Wednesday was the most reliable day to fly (79% on time) and Sunday the least (68%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (45%).
Which airline is most on time from STL to PHX?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Envoy AirRegional airline operating American Eagle flights. | 100% | 0.0% | 2 min | 0.0% | 30 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 96% | 0.0% | 8 min | 3.7% | 27 |
| Frontier Airlines | 83% | 1.9% | 37 min | 13.5% | 53 |
| American Airlines | 81% | 1.0% | 36 min | 10.4% | 586 |
| Southwest Airlines | 71% | 0.3% | 16 min | 7.6% | 1,619 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am96%200 flights
- 6am94%105 flights
- 7am83%243 flights
- 8am91%239 flights
- 9am89%99 flights
- 10am80%67 flights
- 11am75%53 flights
- 12pm97%30 flights
- 1pm66%144 flights
- 2pm75%391 flights
- 4pm60%40 flights
- 5pm58%139 flights
- 6pm58%152 flights
- 7pm61%85 flights
- 8pm60%116 flights
- 9pm47%134 flights
- 10pm52%62 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday73%1.1% cancelled
- Tuesday79%0.3% cancelled
- Wednesday79%0.3% cancelled
- Thursday74%0.3% cancelled
- Friday77%0.6% cancelled
- Saturday74%0.4% cancelled
- Sunday68%0.6% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Airline (crew, maintenance, cleaning, fueling)45%
- Late-arriving aircraft41%
- Air traffic control & airport congestion10%
- Extreme weather4%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather58%
- Airline (crew, maintenance, cleaning, fueling)33%
- Air traffic control & airport congestion8%
- Security0%
STL to PHX: common questions
- How often are STL to PHX flights on time?
- 75% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from St. Louis to Phoenix cancelled?
- 0.5% of scheduled flights were cancelled (12 of 2,315).
- How long are typical delays?
- Across all flights the average arrival delay was 21 min (early arrivals count as zero). Flights that were late arrived 78 min behind schedule on average, and 8.3% of flights were an hour or more late.
- How long is taxi time at STL?
- Flights on this route spent 13 min taxiing from the gate to takeoff on average.
Related routes
Return trip: PHX to STL — 77% on time
More flights from St. Louis
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: STL → PHX, nonstop flights by US airlines that report to the DOT. How we calculate this.