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

Return flights

10 Sep - 27 Sep	Ryanair	direct
10 Sep - 20 Sep	Ryanair	direct
10 Sep - 24 Sep	Ryanair	direct
24 Sep - 27 Sep	Ryanair	direct
10 Sep - 17 Sep	Ryanair	direct
10 Sep - 13 Sep	Ryanair	direct
17 Sep - 27 Sep	Ryanair	direct
17 Sep - 20 Sep	Ryanair	direct
17 Sep - 24 Sep	Ryanair	direct
06 Sep - 27 Sep	Ryanair	direct

Also check the deals for one-way flights from Rijeka to London 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 Rijeka to London in September from 54€

Return flights