Route
STL → BWI
St. Louis Lambert International Airport Baltimore/Washington International Thurgood Marshall Airport
How punctual is this route?
- On-time arrivals
- 79.3%
- Less than 15 minutes late
- Cancelled
- 1.3%
- Of scheduled flights
- Average delay when late
- 63 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,271
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 55%
- Airline (crew, maintenance, cleaning) 28%
- Air traffic control & airport 12%
- Extreme weather 4%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 79.3% | 116 |
| October 2025 | 85.3% | 109 |
| November 2025 | 82.2% | 107 |
| December 2025 | 81.0% | 101 |
| January 2026 | 84.3% | 74 |
| February 2026 | 85.9% | 74 |
| March 2026 | 71.2% | 107 |
| April 2026 | 86.9% | 107 |
| May 2026 | 86.6% | 112 |
| June 2026 | 71.3% | 118 |
| July 2026 | 67.2% | 125 |
| August 2026 | 75.6% | 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 | 1,271 | 79.3% | 1.3% | 63 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3394
27% late · 64 flights
-
WN3897
58% late · 60 flights
-
WN4614
28% late · 60 flights
-
WN4440
3% late · 58 flights
-
WN4442
24% late · 58 flights
-
WN264
19% late · 56 flights
-
WN3894
8% late · 52 flights
-
WN1928
2% late · 47 flights
-
WN3480
7% late · 46 flights
-
WN4422
5% late · 40 flights
-
WN2624
22% late · 36 flights
-
WN793
24% late · 36 flights
-
WN4633
45% late · 33 flights
-
WN1121
10% late · 31 flights
-
WN2502
16% late · 31 flights
-
WN753
23% late · 31 flights
-
WN2523
27% late · 28 flights
-
WN3811
4% late · 28 flights
-
WN1076
7% late · 27 flights
-
WN2737
0% late · 26 flights
-
WN2741
12% late · 25 flights
-
WN2098
8% late · 24 flights
-
WN3144
25% late · 24 flights
-
WN3812
4% late · 24 flights
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