AirHint found the following cheapest return flights from London (STN) to Osijek (OSI) in September 2025 (see full year).

Return flights

13 Sep - 24 Sep	Ryanair	direct
17 Sep - 24 Sep	Ryanair	direct
20 Sep - 24 Sep	Ryanair	direct
13 Sep - 17 Sep	Ryanair	direct
13 Sep - 20 Sep	Ryanair	direct
17 Sep - 20 Sep	Ryanair	direct
20 Sep - 22 Sep	Ryanair
01 Sep - 05 Sep	Ryanair

Also check the deals for one-way flights from London to Osijek 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 Osijek in September from $56

Return flights