AirHint found the following cheapest return flights from Frankfurt (FRA) to Sofia (SOF) in May 2026 (see full year).

Return flights

05 May - 09 May	Ryanair
07 May - 10 May	Ryanair
08 May - 09 May	Ryanair
08 May - 10 May	Ryanair
06 May - 19 May	Lufthansa	direct
08 May - 09 May	Lufthansa	direct
17 May - 30 May	Lufthansa	direct
27 May - 30 May	Lufthansa	direct
29 May - 05 Jun	Lufthansa	direct
28 May - 01 Jun	Lufthansa	direct
29 May - 01 Jun	Lufthansa	direct
14 May - 21 May	Ryanair
01 May - 04 May	Air Serbia
24 May - 06 Jun	Lufthansa	direct
24 May - 05 Jun	Lufthansa
23 May - 06 Jun	Air Serbia
23 May - 06 Jun	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt to Sofia in May.

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 Frankfurt to Sofia in May from $131

Return flights