Route
STL → PIT
St. Louis Lambert International Airport Pittsburgh International Airport
How punctual is this route?
- On-time arrivals
- 78.3%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 65 min
- Flights arriving 15+ minutes late
- Flights tracked
- 522
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 66%
- Airline (crew, maintenance, cleaning) 26%
- Air traffic control & airport 6%
- Extreme weather 2%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 91.2% | 34 |
| October 2025 | 74.3% | 35 |
| November 2025 | 90.3% | 31 |
| December 2025 | 80.6% | 31 |
| January 2026 | 85.2% | 27 |
| February 2026 | 96.3% | 27 |
| March 2026 | 68.5% | 54 |
| April 2026 | 80.4% | 56 |
| May 2026 | 67.3% | 56 |
| June 2026 | 78.6% | 56 |
| July 2026 | 72.4% | 58 |
| August 2026 | 77.2% | 57 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 522 | 78.3% | 0.0% | 65 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2620
46% late · 57 flights
-
WN3972
38% late · 52 flights
-
WN3773
8% late · 50 flights
-
WN3551
4% late · 46 flights
-
WN1056
14% late · 42 flights
-
WN3971
20% late · 35 flights
-
WN2338
33% late · 33 flights
-
WN2074
18% late · 28 flights
-
WN3879
11% late · 28 flights
-
WN1083
7% late · 27 flights
-
WN4290
12% late · 26 flights
-
WN4165
38% late · 24 flights
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