There are several airlines that operate frequent flights from Chicago (ORD) to Houston (IAH) including

• American Airlines with 470 flights a week
• United Airlines with 414 flights a week
• Delta Air Lines with 226 flights a week
• Alaska Airlines with 42 flights a week
• Qantas Airways with 26 flights a week

The earliest flight leaves O'Hare Intl. Airport at 05:00 and arrives at George Bush Intercontinental Airport at 00:06. The last flight of the day departs Chicago at 21:45 and arrives at Houston at 23:59.

The flight distance from Chicago to Houston is about 1496 km, the shortest flight is 02 hours 35 minutes with United Airlines.

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