PHL to STL flight delays & on-time performance
Nonstop flights from Philadelphia International Airport to St. Louis Lambert International Airport · 814 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PHL or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Philadelphia (PHL) to St. Louis (STL) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.6% were cancelled, and 8% arrived an hour or more late.
- Republic Airways was the most punctual airline here (85% on time); PSA Airlines was the least (76%).
- Departures scheduled around 6am did best (94% on time); around 6pm did worst (61%).
- Wednesday was the most reliable day to fly (83% on time) and Thursday the least (72%).
- The largest source of delay minutes was late-arriving aircraft (47%).
Which airline is most on time from PHL 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 |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 85% | 1.0% | 11 min | 4.2% | 96 |
| Southwest Airlines | 79% | 0.6% | 17 min | 7.1% | 726 |
| American Airlines | 76% | 1.4% | 19 min | 9.9% | 647 |
| PSA AirlinesRegional airline operating American Eagle flights. | 76% | 8.8% | 17 min | 12.0% | 137 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am94%142 flights
- 7am88%75 flights
- 8am85%124 flights
- 9am90%108 flights
- 10am84%67 flights
- 11am84%138 flights
- 12pm71%42 flights
- 1pm73%64 flights
- 2pm81%73 flights
- 3pm64%140 flights
- 4pm79%30 flights
- 5pm72%77 flights
- 6pm61%124 flights
- 7pm71%187 flights
- 8pm73%79 flights
- 9pm74%95 flights
- 10pm83%41 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday74%2.0% cancelled
- Tuesday81%2.6% cancelled
- Wednesday83%0.4% cancelled
- Thursday72%0.4% cancelled
- Friday79%0.4% cancelled
- Saturday79%2.9% cancelled
- Sunday78%2.8% 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 aircraft47%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion15%
- Extreme weather6%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather69%
- Airline (crew, maintenance, cleaning, fueling)23%
- Air traffic control & airport congestion8%
- Security0%
PHL to STL: common questions
- How often are PHL to STL flights on time?
- 78% 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 Philadelphia to St. Louis cancelled?
- 1.6% of scheduled flights were cancelled (26 of 1,606).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 73 min behind schedule on average, and 8.4% of flights were an hour or more late.
- How long is taxi time at PHL?
- Flights on this route spent 20 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to PHL — 80% on time
More flights from Philadelphia
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PHL → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.