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

Return flights

07 Sep - 13 Sep	British Airways	direct
19 Sep - 29 Sep	Vueling Airlines
28 Sep - 15 Oct	British Airways
16 Sep - 20 Sep	Lufthansa
25 Sep - 10 Oct	Austrian Airlines
23 Sep - 13 Oct	Eurowings
27 Sep - 30 Sep	Lufthansa
11 Sep - 16 Sep	Lufthansa
11 Sep - 18 Sep	Lufthansa
23 Sep - 30 Sep	Austrian Airlines
16 Sep - 23 Sep	Austrian Airlines
17 Sep - 20 Sep	Lufthansa
11 Sep - 17 Sep	Lufthansa
27 Sep - 14 Oct	Lufthansa
27 Sep - 02 Oct	Lufthansa
24 Sep - 02 Oct	Austrian Airlines
29 Sep - 03 Oct	Austrian Airlines
24 Sep - 03 Oct	Austrian Airlines
18 Sep - 04 Oct	Lufthansa
29 Sep - 02 Oct	KLM

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 $216

Return flights