Route
HOU → STL
William P. Hobby Airport St. Louis Lambert International Airport
How punctual is this route?
- On-time arrivals
- 79.8%
- Less than 15 minutes late
- Cancelled
- 0.4%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 1,567
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 51%
- Airline (crew, maintenance, cleaning) 31%
- Air traffic control & airport 13%
- Extreme weather 4%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 88.0% | 125 |
| October 2025 | 78.9% | 123 |
| November 2025 | 89.3% | 132 |
| December 2025 | 86.2% | 138 |
| January 2026 | 93.3% | 106 |
| February 2026 | 81.1% | 106 |
| March 2026 | 67.8% | 143 |
| April 2026 | 80.2% | 132 |
| May 2026 | 72.1% | 132 |
| June 2026 | 68.9% | 133 |
| July 2026 | 79.5% | 159 |
| August 2026 | 76.8% | 138 |
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 | 1,567 | 79.8% | 0.4% | 55 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN2999
3% late · 63 flights
-
WN1950
4% late · 58 flights
-
WN2422
11% late · 58 flights
-
WN2426
30% late · 57 flights
-
WN3011
21% late · 54 flights
-
WN568
10% late · 52 flights
-
WN2425
43% late · 50 flights
-
WN1765
15% late · 47 flights
-
WN3273
16% late · 45 flights
-
WN4084
16% late · 44 flights
-
WN4642
23% late · 43 flights
-
WN498
15% late · 42 flights
-
WN2084
26% late · 36 flights
-
WN1953
17% late · 35 flights
-
WN2087
26% late · 35 flights
-
WN2802
27% late · 33 flights
-
WN3319
48% late · 33 flights
-
WN344
9% late · 33 flights
-
WN3026
0% late · 31 flights
-
WN3028
19% late · 31 flights
-
WN3081
45% late · 31 flights
-
WN2019
4% late · 28 flights
-
WN3315
39% late · 28 flights
-
WN4724
26% late · 27 flights
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