PIT to STL flight delays & on-time performance
Nonstop flights from Pittsburgh International Airport to St. Louis Lambert International Airport · 554 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at PIT or STL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Pittsburgh (PIT) to St. Louis (STL) arrived on time 81% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.2% were cancelled, and 6% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 7am did best (98% on time); around 8pm did worst (49%).
- Tuesday was the most reliable day to fly (90% on time) and Monday the least (75%).
- The largest source of delay minutes was late-arriving aircraft (74%).
Which airline is most on time from PIT 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 |
|---|---|---|---|---|---|
| Southwest Airlines | 81% | 0.2% | 10 min | 5.6% | 499 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am96%127 flights
- 7am98%40 flights
- 8am95%20 flights
- 12pm89%45 flights
- 1pm88%32 flights
- 2pm92%13 flights
- 3pm96%24 flights
- 4pm79%24 flights
- 5pm54%13 flights
- 6pm85%14 flights
- 7pm69%49 flights
- 8pm49%91 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday75%0.0% cancelled
- Tuesday90%0.0% cancelled
- Wednesday85%0.0% cancelled
- Thursday78%0.0% cancelled
- Friday76%0.0% cancelled
- Saturday89%0.0% cancelled
- Sunday79%1.2% 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 aircraft74%
- Airline (crew, maintenance, cleaning, fueling)13%
- Air traffic control & airport congestion12%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
PIT to STL: common questions
- How often are PIT to STL flights on time?
- 81% 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 Pittsburgh to St. Louis cancelled?
- 0.2% of scheduled flights were cancelled (1 of 499).
- How long are typical delays?
- Across all flights the average arrival delay was 10 min (early arrivals count as zero). Flights that were late arrived 51 min behind schedule on average, and 5.6% of flights were an hour or more late.
- How long is taxi time at PIT?
- Flights on this route spent 12 min taxiing from the gate to takeoff on average.
Related routes
Return trip: STL to PIT — 79% on time
More flights from Pittsburgh
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: PIT → STL, nonstop flights by US airlines that report to the DOT. How we calculate this.