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

Return flights

11 Mar - 22 Mar	Frontier Airlines
01 Mar - 08 Mar	Aer Lingus
18 Mar - 22 Mar	Frontier Airlines
12 Mar - 22 Mar	Frontier Airlines
13 Mar - 22 Mar	Frontier Airlines
15 Mar - 25 Mar	Frontier Airlines
11 Mar - 18 Mar	Lufthansa
12 Mar - 21 Mar	Frontier Airlines
31 Mar - 07 Apr	Lufthansa
25 Mar - 01 Apr	Lufthansa	direct
17 Mar - 24 Mar	Lufthansa
19 Mar - 26 Mar	Lufthansa
29 Mar - 05 Apr	Lufthansa	direct

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

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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Cheapest return flights from St. Louis to Frankfurt in March from $858

Return flights