St Louis (STL) to Pittsburgh (PIT) flights
Southwest Airlines flies nonstop from St. Louis Lambert International Airport to Pittsburgh International Airport, with about 14 flights a week in July 2026. The 554-mile flight takes about 1h 31m gate to gate.
- Distance
- 554 mi · 892 km
- Flight time
- 1h 31m
- Airlines
- 1
- Seats filled
- 64%
Airlines flying STL to PIT
| Airline | Flights a week | Aircraft | Passengers (12 months) | Flight time |
|---|---|---|---|---|
| Southwest Airlines | 14 | Boeing 737-700 / MAX 7, Boeing 737 MAX 8, Boeing 737-800 | 50,401 | 1h 31m |
Airlines are the operating carrier: regional airlines such as SkyWest or Horizon often fly under a larger airline's brand.
STL to PIT flight schedule
2 flight numbers flew this route in August 2026, 2 of them almost daily. The first usually leaves at 10:30am and the last at 7:35pm. Times are local and can change; check with the airline before you book.
| Flight | Departs | Arrives | Days flown in August 2026 | On time (12 months) |
|---|---|---|---|---|
| WN 3879Southwest Airlines | 10:30am | 1:10pm | 28 | 89% |
| WN 4165Southwest Airlines | 7:35pm | 10:15pm | 24 | 63% |
Is STL to PIT on time?
From September 2025 to August 2026, 78% of 522 flights arrived within 15 minutes of schedule and 0% were cancelled. Flights leaving around 8am were the most punctual (88%), those around 7pm the least (62%). Most delay time was caused by late-arriving aircraft (66%).
| Airline | Flights | On time | Average delay | Cancelled |
|---|---|---|---|---|
| Southwest Airlines | 522 | 78% | 14 min | 0% |
Airlines as sold: flights operated by regional partners count under the airline on the ticket. Average delay is across all completed flights, early arrivals counted as zero.
On-time arrivals by departure time
| Scheduled departure | Flights | On time, relative | On time |
|---|---|---|---|
| 8am to 9am | 69 | 88% | |
| 10am to 11am | 171 | 88% | |
| 2pm to 3pm | 15 | 93% | |
| 3pm to 4pm | 16 | 69% | |
| 6pm to 7pm | 102 | 78% | |
| 7pm to 8pm | 117 | 62% |
Flights by month
| Month | Flights | Flights, relative | Passengers |
|---|---|---|---|
| August 2025 | 35 | 3,316 | |
| September 2025 | 35 | 3,061 | |
| October 2025 | 36 | 4,346 | |
| November 2025 | 32 | 3,312 | |
| December 2025 | 31 | 2,902 | |
| January 2026 | 28 | 2,253 | |
| February 2026 | 28 | 2,109 | |
| March 2026 | 59 | 5,108 | |
| April 2026 | 58 | 5,830 | |
| May 2026 | 56 | 5,729 | |
| June 2026 | 58 | 6,237 | |
| July 2026 | 60 | 6,521 |
Related
Source: US Department of Transportation, T-100 Segment data, August 2025 to July 2026.