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

Return flights

09 May - 11 May	Ryanair
08 May - 11 May	Ryanair
07 May - 11 May	Ryanair
13 May - 22 May	Ryanair
21 May - 24 May	Lufthansa
04 May - 11 May	Air Serbia
13 May - 17 May	Air Serbia
16 May - 21 May	Air Serbia
13 May - 18 May	Air Serbia
14 May - 17 May	Air Serbia
29 May - 02 Jun	Lufthansa	direct
31 May - 07 Jun	Lufthansa	direct
30 May - 07 Jun	Lufthansa	direct
28 May - 06 Jun	Lufthansa	direct
29 May - 07 Jun	Air Serbia
29 May - 14 Jun	Air Serbia
29 May - 06 Jun	Croatia Airlines
29 May - 07 Jun	Lufthansa	direct
29 May - 06 Jun	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt to Zagreb 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 Zagreb in May from $147

Return flights