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1,076 km · Domestic

George Bush Intercontinental (IAH) – St. Louis Lambert (STL)

In July 2026, 52 flights operated between George Bush Intercontinental and St. Louis Lambert (both directions), and 75.0% 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
January10366▼ 35.9%
February7758▼ 24.7%
March6860▼ 11.8%
April18060▼ 66.7%
May11560▼ 47.8%
June9740▼ 58.8%
July6352▼ 17.5%
August73––
September101––
October101–in progress
November97––
December67––
Year to date (Jan–Jul)703396▼ 43.7%

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
January82.5%78.8%▼ 4.5%
February85.7%84.5%▼ 1.4%
March83.8%81.7%▼ 2.5%
April82.2%86.7%▲ 5.5%
May75.7%75.0%▼ 0.9%
June48.5%80.0%▲ 64.9%
July68.3%75.0%▲ 9.8%
August74.0%––
September91.1%––
October87.1%–in progress
November77.3%––
December77.6%––
Year-to-date average (Jan–Jul)75.2%80.2%▲ 6.6%

Cancelled flights by month

The most recent periods19 periods
PeriodCancelled flights 2025Cancelled flights 2026Change vs last year
January94▼ 55.6%
February00–
March02–
April00–
May30▼ 100.0%
June00–
July00–
August1––
September0––
October0–in progress
November1––
December0––
Year to date (Jan–Jul)126▼ 50.0%

Airlines on this route

  1. United Airlines 83.6%
  2. SkyWest Airlines 16.4%

Oct 1, 2024 – Jul 31, 2026

By direction

IAH → STL

Scheduled flights
936
Flights operated
927
Cancelled
9 · 1.0%
On-time departures
76.8%

STL → IAH

Scheduled flights
941
Flights operated
928
Cancelled
13 · 1.4%
On-time departures
83.2%

IAH → STL and STL → IAH counted separately.

Airlines on this route

Oct 1, 2024 – Jul 31, 2026
AirlineScheduled flights Share On-time departures Cancelled
United Airlines UA 1,569 83.6% 80.9% 22
SkyWest Airlines OO 308 16.4% 75.6% 0

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 delay06:00–07:002.9min · 442 recorded · 435 measured
Gap to highest-delay hour17.8min06:00 ↔ 20:00
Recorded flights1,877IAH–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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 89.9% · 442 recorded · 435 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 33 recorded · 33 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 150 recorded · 147 measured · Source: the US BTS 09:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 38 recorded · 38 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 120 recorded · 119 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 68 recorded · 66 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 184 recorded · 184 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 16:00 · 82.6% · 250 recorded · 247 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 58 recorded · 58 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 65 recorded · 65 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 128 recorded · 125 measured · Source: the US BTS 20:00 · 71.2% · 287 recorded · 285 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 52 recorded · 51 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 2.9 min · 442 recorded · 435 measured · Source: the US BTS 07:00 · Fewer than 200 measured departures · 33 recorded · 33 measured · Source: the US BTS 08:00 · Fewer than 200 measured departures · 150 recorded · 147 measured · Source: the US BTS 09:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 10:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 11:00 · Fewer than 200 measured departures · 38 recorded · 38 measured · Source: the US BTS 12:00 · Fewer than 200 measured departures · 120 recorded · 119 measured · Source: the US BTS 13:00 · Fewer than 200 measured departures · 68 recorded · 66 measured · Source: the US BTS 14:00 · Fewer than 200 measured departures · 184 recorded · 184 measured · Source: the US BTS 15:00 · Fewer than 200 measured departures · 1 recorded · 1 measured · Source: the US BTS 16:00 · 9.3 min · 250 recorded · 247 measured · Source: the US BTS 17:00 · Fewer than 200 measured departures · 58 recorded · 58 measured · Source: the US BTS 18:00 · Fewer than 200 measured departures · 65 recorded · 65 measured · Source: the US BTS 19:00 · Fewer than 200 measured departures · 128 recorded · 125 measured · Source: the US BTS 20:00 · 20.8 min · 287 recorded · 285 measured · Source: the US BTS 21:00 · Fewer than 200 measured departures · 52 recorded · 51 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 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 · No observations · 0 recorded · 0 measured · Source: the US BTS 06:00 · 442 · 442 recorded · 435 measured · Source: the US BTS 07:00 · 33 · 33 recorded · 33 measured · Source: the US BTS 08:00 · 150 · 150 recorded · 147 measured · Source: the US BTS 09:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 10:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 11:00 · 38 · 38 recorded · 38 measured · Source: the US BTS 12:00 · 120 · 120 recorded · 119 measured · Source: the US BTS 13:00 · 68 · 68 recorded · 66 measured · Source: the US BTS 14:00 · 184 · 184 recorded · 184 measured · Source: the US BTS 15:00 · 1 · 1 recorded · 1 measured · Source: the US BTS 16:00 · 250 · 250 recorded · 247 measured · Source: the US BTS 17:00 · 58 · 58 recorded · 58 measured · Source: the US BTS 18:00 · 65 · 65 recorded · 65 measured · Source: the US BTS 19:00 · 128 · 128 recorded · 125 measured · Source: the US BTS 20:00 · 287 · 287 recorded · 285 measured · Source: the US BTS 21:00 · 52 · 52 recorded · 51 measured · Source: the US BTS 22:00 · No observations · 0 recorded · 0 measured · Source: the US BTS 23:00 · No observations · 0 recorded · 0 measured · Source: the US BTS

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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———
05:00No observations———
06:0089.9%2.9 min435442
07:00Fewer than 200 measured departures—3333
08:00Fewer than 200 measured departures—147150
09:00No observations———
10:00Fewer than 200 measured departures—11
11:00Fewer than 200 measured departures—3838
12:00Fewer than 200 measured departures—119120
13:00Fewer than 200 measured departures—6668
14:00Fewer than 200 measured departures—184184
15:00Fewer than 200 measured departures—11
16:0082.6%9.3 min247250
17:00Fewer than 200 measured departures—5858
18:00Fewer than 200 measured departures—6565
19:00Fewer than 200 measured departures—125128
20:0071.2%20.8 min285287
21:00Fewer than 200 measured departures—5152
22:00No observations———
23:00No observations———

Day of week

On-time departures Partial coverage: only airlines that report on-time data to the US DOT
Monday · 75.8% · 291 recorded · 289 measured · Source: the US BTS Tuesday · 86.7% · 238 recorded · 233 measured · Source: the US BTS Wednesday · 84.6% · 269 recorded · 267 measured · Source: the US BTS Thursday · 73.0% · 286 recorded · 285 measured · Source: the US BTS Friday · 81.1% · 271 recorded · 270 measured · Source: the US BTS Saturday · 82.4% · 228 recorded · 221 measured · Source: the US BTS Sunday · 78.6% · 294 recorded · 290 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 · 25.0 min · 291 recorded · 289 measured · Source: the US BTS Tuesday · 4.1 min · 238 recorded · 233 measured · Source: the US BTS Wednesday · 7.0 min · 269 recorded · 267 measured · Source: the US BTS Thursday · 18.2 min · 286 recorded · 285 measured · Source: the US BTS Friday · 13.4 min · 271 recorded · 270 measured · Source: the US BTS Saturday · 9.2 min · 228 recorded · 221 measured · Source: the US BTS Sunday · 15.8 min · 294 recorded · 290 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 · 291 · 291 recorded · 289 measured · Source: the US BTS Tuesday · 238 · 238 recorded · 233 measured · Source: the US BTS Wednesday · 269 · 269 recorded · 267 measured · Source: the US BTS Thursday · 286 · 286 recorded · 285 measured · Source: the US BTS Friday · 271 · 271 recorded · 270 measured · Source: the US BTS Saturday · 228 · 228 recorded · 221 measured · Source: the US BTS Sunday · 294 · 294 recorded · 290 measured · Source: the US BTS

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View the figures
Day of weekOn-time departuresAverage departure delayWith departure timeRecorded flights
Monday75.8%25.0 min289291
Tuesday86.7%4.1 min233238
Wednesday84.6%7.0 min267269
Thursday73.0%18.2 min285286
Friday81.1%13.4 min270271
Saturday82.4%9.2 min221228
Sunday78.6%15.8 min290294

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 · Fewer than 200 measured departures · 182 recorded · 169 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 135 recorded · 135 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 130 recorded · 128 measured · Source: the US BTS Apr · 83.3% · 240 recorded · 240 measured · Source: the US BTS May · Fewer than 200 measured departures · 178 recorded · 175 measured · Source: the US BTS Jun · Fewer than 200 measured departures · 137 recorded · 137 measured · Source: the US BTS Jul · Fewer than 200 measured departures · 115 recorded · 115 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 74 recorded · 73 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 101 recorded · 101 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 183 recorded · 183 measured · Source: the US BTS Nov · 83.5% · 219 recorded · 218 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 183 recorded · 181 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 · Fewer than 200 measured departures · 182 recorded · 169 measured · Source: the US BTS Feb · Fewer than 200 measured departures · 135 recorded · 135 measured · Source: the US BTS Mar · Fewer than 200 measured departures · 130 recorded · 128 measured · Source: the US BTS Apr · 8.9 min · 240 recorded · 240 measured · Source: the US BTS May · Fewer than 200 measured departures · 178 recorded · 175 measured · Source: the US BTS Jun · Fewer than 200 measured departures · 137 recorded · 137 measured · Source: the US BTS Jul · Fewer than 200 measured departures · 115 recorded · 115 measured · Source: the US BTS Aug · Fewer than 200 measured departures · 74 recorded · 73 measured · Source: the US BTS Sep · Fewer than 200 measured departures · 101 recorded · 101 measured · Source: the US BTS Oct · Fewer than 200 measured departures · 183 recorded · 183 measured · Source: the US BTS Nov · 8.6 min · 219 recorded · 218 measured · Source: the US BTS Dec · Fewer than 200 measured departures · 183 recorded · 181 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 · 182 · 182 recorded · 169 measured · Source: the US BTS Feb · 135 · 135 recorded · 135 measured · Source: the US BTS Mar · 130 · 130 recorded · 128 measured · Source: the US BTS Apr · 240 · 240 recorded · 240 measured · Source: the US BTS May · 178 · 178 recorded · 175 measured · Source: the US BTS Jun · 137 · 137 recorded · 137 measured · Source: the US BTS Jul · 115 · 115 recorded · 115 measured · Source: the US BTS Aug · 74 · 74 recorded · 73 measured · Source: the US BTS Sep · 101 · 101 recorded · 101 measured · Source: the US BTS Oct · 183 · 183 recorded · 183 measured · Source: the US BTS Nov · 219 · 219 recorded · 218 measured · Source: the US BTS Dec · 183 · 183 recorded · 181 measured · Source: the US BTS

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View the figures
Month of yearOn-time departuresAverage departure delayWith departure timeRecorded flights
JanFewer than 200 measured departures—169182
FebFewer than 200 measured departures—135135
MarFewer than 200 measured departures—128130
Apr83.3%8.9 min240240
MayFewer than 200 measured departures—175178
JunFewer than 200 measured departures—137137
JulFewer than 200 measured departures—115115
AugFewer than 200 measured departures—7374
SepFewer than 200 measured departures—101101
OctFewer than 200 measured departures—183183
Nov83.5%8.6 min218219
DecFewer than 200 measured departures—181183

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 79.1% 1,484
  • Delayed >15 min 19.8% 371
  • Cancelled 1.2% 22
  • 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

25
25 of 25
Flight numbersBy direction DeparturesOn time
UA1371 STL → IAH 350 88.9%
UA2368 IAH → STL 110 83.6%
UA2121 STL → IAH 107 81.9%
UA2648 IAH → STL 79 82.9%
OO5397 IAH → STL 50 80.0%
OO5580 STL → IAH 50 66.0%
UA2618 STL → IAH 48 58.3%
UA1277 STL → IAH 44 90.7%
UA2105 STL → IAH 42 75.6%
OO4754 IAH → STL 38 71.1%
OO5478 STL → IAH 38 71.1%
UA744 IAH → STL 38 79.0%
UA1662 IAH → STL 37 80.6%
UA1706 IAH → STL 37 83.3%
UA445 IAH → STL 37 69.4%
UA1068 STL → IAH 36 94.4%
UA604 STL → IAH 36 80.6%
UA1973 IAH → STL 35 51.4%
OO5223 IAH → STL 32 75.0%
OO5514 STL → IAH 32 78.1%
UA1640 IAH → STL 32 90.6%
UA2390 IAH → STL 32 68.8%
UA1293 IAH → STL 31 83.9%
UA2384 IAH → STL 31 83.9%
UA2480 STL → IAH 30 89.7%

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 52 −17.5% 0 75.0%
June 2026 40 −58.8% 0 80.0%
May 2026 60 −47.8% 0 75.0%
April 2026 60 −66.7% 0 86.7%
March 2026 60 −11.8% 2 81.7%
February 2026 58 −24.7% 0 84.5%
January 2026 66 −35.9% 4 78.8%
December 2025 67 −41.2% 0 77.6%
November 2025 97 −19.8% 1 77.3%
October 2025 101 +23.2% 0 87.1%
September 2025 101 0 91.1%
August 2025 73 1 74.0%
July 2025 63 0 68.3%
June 2025 97 0 48.5%
May 2025 115 3 75.7%
April 2025 180 0 82.2%
March 2025 68 0 83.8%
February 2025 77 0 85.7%
January 2025 103 9 82.5%
December 2024 114 2 84.2%
November 2024 121 0 88.4%
October 2024 82 0 84.1%

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