AirHint found the following cheapest return flights from London (LHR) to Zagreb (ZAG) in September 2025 (see full year).

Return flights

27 Sep - 29 Sep	Air France
27 Sep - 04 Oct	Air France
27 Sep - 30 Sep	Air France
27 Sep - 01 Oct	Air France
26 Sep - 03 Oct	Vueling Airlines
22 Sep - 29 Sep	Croatia Airlines
25 Sep - 29 Sep	KLM
29 Sep - 09 Oct	Austrian Airlines
29 Sep - 04 Oct	KLM
27 Sep - 02 Oct	Air France
25 Sep - 30 Sep	Air Serbia
29 Sep - 02 Oct	KLM
27 Sep - 03 Oct	Air France
24 Sep - 01 Oct	Croatia Airlines	direct
29 Sep - 06 Oct	Croatia Airlines	direct
24 Sep - 27 Sep	Eurowings
23 Sep - 30 Sep	Air Serbia
24 Sep - 29 Sep	Croatia Airlines
24 Sep - 27 Sep	Croatia Airlines	direct
29 Sep - 30 Sep	Croatia Airlines

Also check the deals for one-way flights from London to Zagreb in September.

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 London to Zagreb in September from 199€

Return flights