Houston (IAH) to St Louis (STL)
Flight time
≈ 2h 08m
Bearing
24° NE
Houston (IAH) to St Louis (STL) is 668 miles (1,076 km) as the crow flies — the great-circle baseline most distance-based mileage programs credit.
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What actually flies IAH–STL
US DOT T-100 · filed dataIn April 2026, Mesa Airlines operated the most departures, one of 2 carriers flying nonstop IAH–STL; the Embraer E175 was the most common aircraft at 66% of departures; flights ran 73% full.
Departures
182
April 2026
Seats
18,196
both directions
Passengers
13,255
both directions
Load factor
72.9%
passengers ÷ seats
Who flies IAH–STL?
Mesa Airlines operated the most nonstop IAH–STL departures in April 2026 (120), one of 2 carriers on the route.
- YV
Mesa Airlines
120 departures · 8,556 seats
Share of departures65.9%84.3%
Load
- UA
United Airlines
62 departures · 9,640 seats
Share of departures34.1%62.7%
Load
What plane flies IAH–STL?
In April 2026, the Embraer E175 flew 66% of IAH–STL departures — more than any other aircraft type.
- Embraer E175
120 departures · 84.3% load
65.9% - Airbus A320
51 departures · 64.6% load
28.0% - Boeing 737-900ER
9 departures · 60.6% load
5.0% - Airbus A321neo
1 departures · 45.0% load
0.5% - Boeing 737 MAX 9
1 departures · 17.3% load
0.5%
How has IAH–STL traffic changed?
Nonstop IAH–STL departures fell from 237 in May 2025 to 182 in April 2026.
Monthly nonstop IAH–STL traffic, trailing 12 months through April 2026. Bars scale to the busiest month; months with no filed service show as zero.
May 2025
237 departures · 19,129 passengers
76.0%
Load
June 2025
216 departures · 18,786 passengers
76.4%
Load
July 2025
211 departures · 14,090 passengers
87.1%
Load
August 2025
220 departures · 14,726 passengers
77.7%
Load
September 2025
227 departures · 16,134 passengers
66.9%
Load
October 2025
219 departures · 17,223 passengers
70.3%
Load
November 2025
222 departures · 15,456 passengers
70.7%
Load
December 2025
182 departures · 14,656 passengers
83.8%
Load
January 2026
169 departures · 13,942 passengers
79.5%
Load
February 2026
163 departures · 12,904 passengers
81.3%
Load
March 2026
185 departures · 13,995 passengers
81.1%
Load
April 2026
182 departures · 13,255 passengers
72.9%
Load
By direction
The DOT files each direction separately — they rarely match.
IAH → STL
72.7% full
92 departures · 6,766 passengers
STL → IAH
73.0% full
90 departures · 6,489 passengers
Nonstop IAH–STL traffic has been filed with the US DOT since 2025.
Source: US DOT BTS Form 41 T-100 Segment (All Carriers). Data through April 2026; filings from 2025. Public domain (US Government work). The DOT publishes roughly three months in arrears.
The airports
Frequently asked
How far is Houston (IAH) from St Louis (STL)?
IAH to STL is 668 miles (1,076 km / 581 nautical miles) measured great-circle — the shortest path over the surface of the Earth.
How long is the flight from IAH to STL?
A nonstop covers the 668-mile great-circle distance in roughly 2h 08m of block time, before winds. Actual schedules vary a few percent by direction and aircraft.
What plane flies IAH–STL?
In April 2026, the Embraer E175 flew the largest share of departures (65.9%), followed by the Airbus A320 (28.0%).
What mileage do I earn flying IAH–STL?
Distance-based programs credit off the 668-mile great-circle figure, then apply your fare-class earning rate. Revenue-based programs credit off the fare instead.
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