PHX to STL flight delays & on-time performance
Nonstop flights from Phoenix Sky Harbor International Airport to St. Louis Lambert International Airport · 1,262 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PHX or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Phoenix (PHX) to St. Louis (STL) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 0.3% were cancelled, and 6% arrived an hour or more late.
- American Airlines was the most punctual airline here (78% on time); Southwest Airlines was the least (75%).
- Departures scheduled around 7am did best (96% on time); around 8pm did worst (55%).
- Wednesday was the most reliable day to fly (84% on time) and Monday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (51%).
Which airline is most on time from PHX to STL?
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. | 93% | 0.0% | 6 min | 3.3% | 30 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 89% | 0.0% | 5 min | 0.0% | 28 |
| Frontier Airlines | 83% | 1.9% | 30 min | 9.6% | 53 |
| American Airlines | 78% | 0.7% | 16 min | 8.3% | 585 |
| Southwest Airlines | 75% | 0.2% | 13 min | 5.8% | 1,620 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am93%210 flights
- 6am95%88 flights
- 7am96%113 flights
- 8am80%288 flights
- 9am85%158 flights
- 10am86%74 flights
- 11am75%82 flights
- 12pm80%133 flights
- 1pm74%168 flights
- 2pm56%81 flights
- 3pm75%57 flights
- 4pm62%198 flights
- 5pm76%50 flights
- 6pm71%280 flights
- 7pm74%149 flights
- 8pm55%175 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday71%1.1% cancelled
- Tuesday82%0.0% cancelled
- Wednesday84%0.0% cancelled
- Thursday75%0.0% cancelled
- Friday78%0.8% cancelled
- Saturday74%0.0% cancelled
- Sunday71%0.3% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft51%
- Airline (crew, maintenance, cleaning, fueling)39%
- Air traffic control & airport congestion8%
- Extreme weather2%
- Security1%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather75%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion0%
- Security0%
PHX to STL: common questions
- How often are PHX to STL flights on time?
- 77% 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 Phoenix to St. Louis cancelled?
- 0.3% of scheduled flights were cancelled (8 of 2,316).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 54 min behind schedule on average, and 6.5% of flights were an hour or more late.
- How long is taxi time at PHX?
- Flights on this route spent 14 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to PHX — 75% on time
More flights from Phoenix
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PHX → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.