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

Return flights

06 May - 11 May	Ryanair
02 May - 12 Jun	Lufthansa	direct
20 May - 23 May	Lufthansa	direct
09 May - 11 May	Lufthansa	direct
26 May - 30 May	Lufthansa	direct
12 May - 26 May	Lufthansa	direct
29 May - 05 Jun	Lufthansa	direct
27 May - 01 Jun	Lufthansa	direct
09 May - 14 May	Lufthansa	direct
06 May - 11 May	Lufthansa	direct
01 May - 06 May	Air Serbia
22 May - 25 May	Air Serbia
13 May - 17 May	Air Serbia
25 May - 06 Jun	Air Serbia

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 134€

Return flights