Route
BWI → STL
Baltimore/Washington International Thurgood Marshall Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 81.3%
- Less than 15 minutes late
- Cancelled
- 1.3%
- Of scheduled flights
- Average delay when late
- 61 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,260
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 50%
- Airline (crew, maintenance, cleaning) 33%
- Air traffic control & airport 15%
- Extreme weather 2%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 90.6% | 117 |
| October 2025 | 82.1% | 106 |
| November 2025 | 87.7% | 107 |
| December 2025 | 75.8% | 101 |
| January 2026 | 85.5% | 73 |
| February 2026 | 91.8% | 74 |
| March 2026 | 78.5% | 107 |
| April 2026 | 88.7% | 107 |
| May 2026 | 81.1% | 111 |
| June 2026 | 76.4% | 111 |
| July 2026 | 70.2% | 125 |
| August 2026 | 73.5% | 121 |
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 | 1,260 | 81.3% | 1.3% | 61 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN1111
41% late · 61 flights
-
WN1109
10% late · 60 flights
-
WN987
33% late · 58 flights
-
WN1333
7% late · 57 flights
-
WN1337
12% late · 49 flights
-
WN1110
18% late · 44 flights
-
WN1118
51% late · 44 flights
-
WN2935
5% late · 42 flights
-
WN1933
20% late · 41 flights
-
WN1729
24% late · 38 flights
-
WN1788
33% late · 33 flights
-
WN3191
9% late · 33 flights
-
WN3835
30% late · 33 flights
-
WN2224
3% late · 31 flights
-
WN2734
10% late · 31 flights
-
WN1053
4% late · 30 flights
-
WN1097
4% late · 28 flights
-
WN2389
18% late · 28 flights
-
WN1962
4% late · 27 flights
-
WN1096
12% late · 24 flights
-
WN1173
17% late · 24 flights
-
WN1335
8% late · 24 flights
-
WN1959
8% late · 24 flights
-
WN1557
10% late · 20 flights
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