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1,108 km · Domestic

William P. Hobby (HOU) – St. Louis Lambert (STL)

In July 2026, 303 flights operated between William P. Hobby and St. Louis Lambert (both directions), and 67.7% left on time, according to the US BTS.

Official · July 2026 according to the US BTS only airlines required to report on-time data to the US DOT

Flights per month

Only complete months are shown. A month appears once the source has published every day of it.

The most recent periods19 periods
PeriodFlights operated 2025Flights operated 2026Change vs last year
January190212▲ 11.6%
February216212▼ 1.9%
March274282▲ 2.9%
April250263▲ 5.2%
May257261▲ 1.6%
June275259▼ 5.8%
July287303▲ 5.6%
August259––
September249––
October246–in progress
November264––
December276––
Year to date (Jan–Jul)1,7491,792▲ 2.5%

On-time departures by month

Departures within 15 minutes of schedule.

The most recent periods19 periods
PeriodOn-time departures 2025On-time departures 2026Change vs last year
January84.2%86.3%▲ 2.5%
February83.8%80.7%▼ 3.7%
March80.7%64.5%▼ 20.1%
April84.8%81.0%▼ 4.5%
May79.8%67.4%▼ 15.5%
June74.2%64.9%▼ 12.5%
July74.2%67.7%▼ 8.8%
August76.4%––
September85.1%––
October78.5%–in progress
November77.7%––
December73.6%––
Year-to-date average (Jan–Jul)80.2%73.2%▼ 8.8%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January231▼ 95.7%
February20▼ 100.0%
March00–
April00–
May42▼ 50.0%
June30▼ 100.0%
July16▲ 500.0%
August1––
September1––
October0–in progress
November1––
December0––
Year to date (Jan–Jul)339▼ 72.7%

By direction

HOU → STL

Scheduled flights
2,791
Flights operated
2,765
Cancelled
26 · 0.9%
On-time departures
79.1%

STL → HOU

Scheduled flights
2,772
Flights operated
2,751
Cancelled
21 · 0.8%
On-time departures
76.3%

HOU → STL and STL → HOU counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
Southwest Airlines WN 5,563 100.0% 77.7% 47

Shares are of scheduled flights in the period shown. Codeshare flights are counted once, under the operating airline.

Flight timing & delays

Historical departures, grouped by the scheduled local time at the departure airport. These are recorded outcomes, not a forecast for your flight.

Times are local to the departure airport of each flight; both directions are combined.

US domestic sectors recorded by BTS

Source: the US BTS · Oct 12, 2024 → Jul 31, 2026

Lowest average delay05:00–06:00-2.2min · 750 recorded · 742 measured
Gap to highest-delay hour26.0min05:00 ↔ 21:00
Recorded flights5,563HOU–STL

Departure hour

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 96.0% · 750 recorded · 742 measured · Source: the US BTS 06:00 · 94.8% · 239 recorded · 232 measured · Source: the US BTS 07:00 · 93.3% · 525 recorded · 523 measured · Source: the US BTS 08:00 · 91.0% · 359 recorded · 357 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 190 recorded · 189 measured · Source: the US BTS 10:00 · 86.0% · 209 recorded · 207 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 148 recorded · 146 measured · Source: the US BTS 12:00 · 76.8% · 281 recorded · 280 measured · Source: the US BTS 13:00 · 72.9% · 256 recorded · 255 measured · Source: the US BTS 14:00 · 62.9% · 212 recorded · 210 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 115 recorded · 113 measured · Source: the US BTS 16:00 · 63.6% · 221 recorded · 220 measured · Source: the US BTS 17:00 · 63.4% · 359 recorded · 358 measured · Source: the US BTS 18:00 · 65.0% · 382 recorded · 380 measured · Source: the US BTS 19:00 · 60.1% · 350 recorded · 348 measured · Source: the US BTS 20:00 · 69.9% · 415 recorded · 409 measured · Source: the US BTS 21:00 · 62.3% · 303 recorded · 300 measured · Source: the US BTS 22:00 · 60.3% · 249 recorded · 247 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · -2.2 min · 750 recorded · 742 measured · Source: the US BTS 06:00 · -0.8 min · 239 recorded · 232 measured · Source: the US BTS 07:00 · 2.0 min · 525 recorded · 523 measured · Source: the US BTS 08:00 · 3.6 min · 359 recorded · 357 measured · Source: the US BTS 09:00 · Fewer than 200 measured departures · 190 recorded · 189 measured · Source: the US BTS 10:00 · 6.2 min · 209 recorded · 207 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 148 recorded · 146 measured · Source: the US BTS 12:00 · 13.8 min · 281 recorded · 280 measured · Source: the US BTS 13:00 · 14.9 min · 256 recorded · 255 measured · Source: the US BTS 14:00 · 20.3 min · 212 recorded · 210 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 115 recorded · 113 measured · Source: the US BTS 16:00 · 18.4 min · 221 recorded · 220 measured · Source: the US BTS 17:00 · 17.8 min · 359 recorded · 358 measured · Source: the US BTS 18:00 · 18.3 min · 382 recorded · 380 measured · Source: the US BTS 19:00 · 22.3 min · 350 recorded · 348 measured · Source: the US BTS 20:00 · 16.2 min · 415 recorded · 409 measured · Source: the US BTS 21:00 · 23.8 min · 303 recorded · 300 measured · Source: the US BTS 22:00 · 20.8 min · 249 recorded · 247 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
00:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 01:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 02:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 03:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 04:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 05:00 · 750 · 750 recorded · 742 measured · Source: the US BTS 06:00 · 239 · 239 recorded · 232 measured · Source: the US BTS 07:00 · 525 · 525 recorded · 523 measured · Source: the US BTS 08:00 · 359 · 359 recorded · 357 measured · Source: the US BTS 09:00 · 190 · 190 recorded · 189 measured · Source: the US BTS 10:00 · 209 · 209 recorded · 207 measured · Source: the US BTS 11:00 · 148 · 148 recorded · 146 measured · Source: the US BTS 12:00 · 281 · 281 recorded · 280 measured · Source: the US BTS 13:00 · 256 · 256 recorded · 255 measured · Source: the US BTS 14:00 · 212 · 212 recorded · 210 measured · Source: the US BTS 15:00 · 115 · 115 recorded · 113 measured · Source: the US BTS 16:00 · 221 · 221 recorded · 220 measured · Source: the US BTS 17:00 · 359 · 359 recorded · 358 measured · Source: the US BTS 18:00 · 382 · 382 recorded · 380 measured · Source: the US BTS 19:00 · 350 · 350 recorded · 348 measured · Source: the US BTS 20:00 · 415 · 415 recorded · 409 measured · Source: the US BTS 21:00 · 303 · 303 recorded · 300 measured · Source: the US BTS 22:00 · 249 · 249 recorded · 247 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Departure hourOn-time departuresAverage departure delayWith departure timeRecorded flights
00:00No observations———
01:00No observations———
02:00No observations———
03:00No observations———
04:00No observations———
05:0096.0%-2.2 min742750
06:0094.8%-0.8 min232239
07:0093.3%2.0 min523525
08:0091.0%3.6 min357359
09:00Fewer than 200 measured departures—189190
10:0086.0%6.2 min207209
11:00Fewer than 200 measured departures—146148
12:0076.8%13.8 min280281
13:0072.9%14.9 min255256
14:0062.9%20.3 min210212
15:00Fewer than 200 measured departures—113115
16:0063.6%18.4 min220221
17:0063.4%17.8 min358359
18:0065.0%18.3 min380382
19:0060.1%22.3 min348350
20:0069.9%16.2 min409415
21:0062.3%23.8 min300303
22:0060.3%20.8 min247249
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 76.3% · 884 recorded · 873 measured · Source: the US BTS Tuesday · 83.3% · 750 recorded · 738 measured · Source: the US BTS Wednesday · 82.8% · 742 recorded · 737 measured · Source: the US BTS Thursday · 76.3% · 861 recorded · 859 measured · Source: the US BTS Friday · 78.6% · 880 recorded · 875 measured · Source: the US BTS Saturday · 77.1% · 580 recorded · 580 measured · Source: the US BTS Sunday · 71.0% · 866 recorded · 854 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Monday · 13.0 min · 884 recorded · 873 measured · Source: the US BTS Tuesday · 6.3 min · 750 recorded · 738 measured · Source: the US BTS Wednesday · 7.5 min · 742 recorded · 737 measured · Source: the US BTS Thursday · 10.4 min · 861 recorded · 859 measured · Source: the US BTS Friday · 11.4 min · 880 recorded · 875 measured · Source: the US BTS Saturday · 10.2 min · 580 recorded · 580 measured · Source: the US BTS Sunday · 17.1 min · 866 recorded · 854 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Monday · 884 · 884 recorded · 873 measured · Source: the US BTS Tuesday · 750 · 750 recorded · 738 measured · Source: the US BTS Wednesday · 742 · 742 recorded · 737 measured · Source: the US BTS Thursday · 861 · 861 recorded · 859 measured · Source: the US BTS Friday · 880 · 880 recorded · 875 measured · Source: the US BTS Saturday · 580 · 580 recorded · 580 measured · Source: the US BTS Sunday · 866 · 866 recorded · 854 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday76.3%13.0 min873884
Tuesday83.3%6.3 min738750
Wednesday82.8%7.5 min737742
Thursday76.3%10.4 min859861
Friday78.6%11.4 min875880
Saturday77.1%10.2 min580580
Sunday71.0%17.1 min854866

Month of year

Months combine the same calendar month across the years shown; this is a seasonal pattern, not a monthly time series.

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Jan · 85.3% · 426 recorded · 402 measured · Source: the US BTS Feb · 82.2% · 430 recorded · 428 measured · Source: the US BTS Mar · 72.5% · 556 recorded · 556 measured · Source: the US BTS Apr · 82.9% · 513 recorded · 513 measured · Source: the US BTS May · 73.6% · 524 recorded · 518 measured · Source: the US BTS Jun · 69.7% · 537 recorded · 534 measured · Source: the US BTS Jul · 70.9% · 597 recorded · 590 measured · Source: the US BTS Aug · 76.5% · 260 recorded · 259 measured · Source: the US BTS Sep · 85.1% · 250 recorded · 249 measured · Source: the US BTS Oct · 81.1% · 418 recorded · 418 measured · Source: the US BTS Nov · 84.8% · 506 recorded · 505 measured · Source: the US BTS Dec · 76.5% · 546 recorded · 544 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Average departure delay Partial coverage: only airlines that report on-time data to the US DOT
Jan · 5.3 min · 426 recorded · 402 measured · Source: the US BTS Feb · 6.2 min · 430 recorded · 428 measured · Source: the US BTS Mar · 16.7 min · 556 recorded · 556 measured · Source: the US BTS Apr · 7.6 min · 513 recorded · 513 measured · Source: the US BTS May · 13.7 min · 524 recorded · 518 measured · Source: the US BTS Jun · 16.0 min · 537 recorded · 534 measured · Source: the US BTS Jul · 17.1 min · 597 recorded · 590 measured · Source: the US BTS Aug · 11.2 min · 260 recorded · 259 measured · Source: the US BTS Sep · 4.3 min · 250 recorded · 249 measured · Source: the US BTS Oct · 8.5 min · 418 recorded · 418 measured · Source: the US BTS Nov · 7.2 min · 506 recorded · 505 measured · Source: the US BTS Dec · 11.3 min · 546 recorded · 544 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

Recorded flights Partial coverage: only airlines that report on-time data to the US DOT
Jan · 426 · 426 recorded · 402 measured · Source: the US BTS Feb · 430 · 430 recorded · 428 measured · Source: the US BTS Mar · 556 · 556 recorded · 556 measured · Source: the US BTS Apr · 513 · 513 recorded · 513 measured · Source: the US BTS May · 524 · 524 recorded · 518 measured · Source: the US BTS Jun · 537 · 537 recorded · 534 measured · Source: the US BTS Jul · 597 · 597 recorded · 590 measured · Source: the US BTS Aug · 260 · 260 recorded · 259 measured · Source: the US BTS Sep · 250 · 250 recorded · 249 measured · Source: the US BTS Oct · 418 · 418 recorded · 418 measured · Source: the US BTS Nov · 506 · 506 recorded · 505 measured · Source: the US BTS Dec · 546 · 546 recorded · 544 measured · Source: the US BTS

Hover, tap or focus a point to see its value, sample and source.

View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
Jan85.3%5.3 min402426
Feb82.2%6.2 min428430
Mar72.5%16.7 min556556
Apr82.9%7.6 min513513
May73.6%13.7 min518524
Jun69.7%16.0 min534537
Jul70.9%17.1 min590597
Aug76.5%11.2 min259260
Sep85.1%4.3 min249250
Oct81.1%8.5 min418418
Nov84.8%7.2 min505506
Dec76.5%11.3 min544546

Delay and on-time rates need at least 200 measured departures per bucket. Smaller samples remain visible in the flight-count chart. An empty slot means no observations, not zero flights.

Recorded outcomes

  • On time 77.1% 4,287
  • Delayed >15 min 22.1% 1,229
  • Cancelled 0.8% 47
  • Missing departure time 0.0% 0

All recorded flights with a known scheduled local time, counted once. Missing actual times are shown separately.

On time means departing no more than 15 minutes after schedule. Cancelled flights and flights missing departure times are excluded from the on-time rate and average delay.

Flight numbers on this route

78
78 of 78
Flight numbersBy direction DeparturesOn time
WN171 HOU → STL 116 94.5%
WN4083 STL → HOU 109 81.1%
WN3268 HOU → STL 108 76.4%
WN1763 STL → HOU 105 94.1%
WN2529 STL → HOU 105 87.4%
WN2633 HOU → STL 99 83.5%
WN2239 HOU → STL 78 88.2%
WN1873 STL → HOU 63 90.5%
WN2999 HOU → STL 63 96.8%
WN1792 STL → HOU 61 88.5%
WN1460 STL → HOU 60 98.3%
WN2826 STL → HOU 60 60.0%
WN3160 HOU → STL 60 95.0%
WN3168 HOU → STL 60 58.3%
WN2977 STL → HOU 59 54.2%
WN1950 HOU → STL 58 98.3%
WN2092 HOU → STL 58 93.0%
WN2422 HOU → STL 58 84.5%
WN3026 HOU → STL 58 91.4%
WN3028 HOU → STL 58 77.6%
WN4467 STL → HOU 58 91.4%
WN1090 STL → HOU 57 98.3%
WN1705 STL → HOU 57 82.5%
WN2082 STL → HOU 57 63.2%
WN2426 HOU → STL 57 67.9%
WN3919 STL → HOU 57 94.6%
WN4466 STL → HOU 57 98.3%
WN3411 STL → HOU 56 89.3%
WN3011 HOU → STL 54 75.5%
WN3965 HOU → STL 52 69.2%
WN568 HOU → STL 52 96.2%
WN3164 HOU → STL 51 68.6%
WN1325 STL → HOU 50 79.6%
WN2425 HOU → STL 50 40.0%
WN2949 STL → HOU 50 91.8%
WN3776 STL → HOU 50 88.0%
WN3928 STL → HOU 50 90.0%
WN915 HOU → STL 50 73.5%
WN925 HOU → STL 50 82.0%
WN3202 HOU → STL 49 100.0%
WN4468 STL → HOU 49 73.5%
WN1765 HOU → STL 47 83.0%
WN3077 STL → HOU 47 95.7%
WN3273 HOU → STL 45 82.2%
WN2019 STL → HOU 43 57.1%
WN2958 STL → HOU 43 60.5%
WN106 STL → HOU 42 95.2%
WN4642 HOU → STL 42 76.2%
WN4710 STL → HOU 42 69.1%
WN498 HOU → STL 42 85.4%
WN791 STL → HOU 42 78.6%
WN991 HOU → STL 42 95.2%
WN4084 HOU → STL 41 82.9%
WN4487 STL → HOU 40 59.0%
WN3638 STL → HOU 39 41.0%
WN4400 HOU → STL 39 73.7%
WN323 STL → HOU 36 80.0%
WN4182 STL → HOU 36 55.6%
WN4706 HOU → STL 36 85.7%
WN1953 HOU → STL 35 80.0%
WN4776 STL → HOU 35 64.7%
WN2084 HOU → STL 34 73.5%
WN4752 STL → HOU 34 35.3%
WN184 HOU → STL 33 93.9%
WN2087 HOU → STL 33 51.5%
WN2303 HOU → STL 33 66.7%
WN2311 STL → HOU 33 42.4%
WN2802 HOU → STL 33 57.6%
WN3319 HOU → STL 33 51.5%
WN344 HOU → STL 33 100.0%
WN3468 STL → HOU 33 72.7%
WN3469 STL → HOU 33 60.6%
WN4542 STL → HOU 33 87.9%
WN4617 STL → HOU 33 42.4%
WN2978 STL → HOU 31 90.3%
WN3081 HOU → STL 31 61.3%
WN3128 STL → HOU 31 80.7%
WN3778 STL → HOU 30 60.0%

Flight numbers are the codes sold on tickets. On shared flights one aircraft can carry several of them. Only numbers with at least 30 flights have a page.

Monthly figures
PeriodFlights operated Change vs last yearCancelled On-time departures
July 2026 303 +5.6% 6 67.7%
June 2026 259 −5.8% 0 64.9%
May 2026 261 +1.6% 2 67.4%
April 2026 263 +5.2% 0 81.0%
March 2026 282 +2.9% 0 64.5%
February 2026 212 −1.9% 0 80.7%
January 2026 212 +11.6% 1 86.3%
December 2025 276 +3.0% 0 73.6%
November 2025 264 +9.5% 1 77.7%
October 2025 246 +43.0% 0 78.5%
September 2025 249 1 85.1%
August 2025 259 1 76.4%
July 2025 287 1 74.2%
June 2025 275 3 74.2%
May 2025 257 4 79.8%
April 2025 250 0 84.8%
March 2025 274 0 80.7%
February 2025 216 2 83.8%
January 2025 190 23 84.2%
December 2024 268 2 79.5%
November 2024 241 0 92.5%
October 2024 172 0 84.9%

How to read this chart

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