Cheapest return flights from Chicago to St. Louis in August from 66€

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

Return flights

16 Aug - 18 Aug Southwest Airlines direct
16 Aug - 23 Aug Southwest Airlines direct
21 Aug - 24 Aug Southwest Airlines direct
16 Aug - 17 Aug Southwest Airlines direct
29 Aug - 01 Sep Southwest Airlines direct
02 Aug - 09 Aug Frontier Airlines
07 Aug - 16 Aug Frontier Airlines
07 Aug - 10 Aug Frontier Airlines
08 Aug - 17 Aug Frontier Airlines
07 Aug - 25 Aug Frontier Airlines
08 Aug - 17 Aug Southwest Airlines direct

Also check the deals for one-way 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.

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