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

Return flights

10 May - 29 May	Ryanair	direct
10 May - 24 May	Ryanair	direct
01 May - 08 May	Ryanair	direct
01 May - 10 May	Ryanair	direct
21 May - 24 May	Eurowings
31 May - 21 Jun	Ryanair	direct
31 May - 14 Jun	Ryanair	direct
27 May - 29 May	Ryanair
31 May - 07 Jun	Ryanair	direct
21 May - 25 May	Eurowings
11 May - 16 May	Ryanair
23 May - 26 May	Ryanair
23 May - 28 May	Ryanair

Also check the deals for one-way flights from Cologne 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 Cologne to Sofia in May from 109€

Return flights