Cheapest return flights from St. Louis to Sofia in March from $660

AirHint found the following cheapest return flights from St. Louis (STL) to Sofia (SOF) in March 2026 (see full year).

Return flights

31 Mar - 24 Apr Lufthansa
22 Mar - 17 Apr Lufthansa
18 Mar - 20 Apr Frontier Airlines
19 Mar - 24 Apr Air Canada
17 Mar - 17 Apr Lufthansa
21 Mar - 17 Apr Lufthansa
03 Mar - 12 Mar Lufthansa
21 Mar - 18 Apr Lufthansa
19 Mar - 19 Apr Frontier Airlines
15 Mar - 17 Apr Lufthansa
06 Mar - 15 Mar Frontier Airlines

Also check the deals for one-way flights from St. Louis to Sofia in March.

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