Cheapest one-way flights from Chicago to St. Louis in August from 39€

AirHint found the following cheapest one-way flights from Chicago (MDW) to St. Louis (STL) in August 2025 (see full year).

One-Way flights

16 Aug Southwest Airlines direct
23 Aug Southwest Airlines direct
30 Aug Southwest Airlines direct
07 Aug Frontier Airlines
10 Aug Frontier Airlines
08 Aug Frontier Airlines
11 Aug Allegiant Air
13 Aug Southwest Airlines direct
12 Aug Southwest Airlines direct
10 Aug Southwest Airlines direct

Also check the deals for return flights from Chicago to St. Louis in August.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in St. Louis

Cheap car rent in St. Louis

Feel free to contact us with any feedback or request another flight research.