The budget carrier announced it will begin service at IAH in the first half of 2021.
The airline previously operated simultaneously out of both Intercontinental and Hobby Airport beginning in 1980. The carrier departed Bush in 2005.
In fact, the airline said it used Intercontinental as one of three airports it operated from on its first day of operation back in June 1971.
The return to IAH was announced hand-in-hand with Southwest also planning simultaneous service out of two airports in Chicago.
"Southwest owes decades of success to our Employees and Customers who have supported our business in Chicago and Houston," said Southwest CEO and Chairman Gary Kelly. "Today's announcement furthers our commitment to both cities as we add service to share Southwest's value and Hospitality with more leisure and business travelers."
Schedules and fares from IAH will be released at a later time.
Southwest's impact on Houston is significant. According to the airline, it provides nearly 4,000 jobs to the city.
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