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

Return flights

29 Sep - 02 Oct	British Airways	direct
28 Sep - 28 Oct	British Airways	direct
26 Sep - 03 Oct	British Airways	direct
22 Sep - 25 Sep	British Airways	direct
27 Sep - 27 Oct	LOT
15 Sep - 19 Oct	LOT
21 Sep - 29 Sep	British Airways	direct
07 Sep - 19 Sep	LOT
18 Sep - 22 Sep	LOT
13 Sep - 22 Sep	LOT
15 Sep - 23 Sep	LOT
18 Sep - 23 Sep	LOT
16 Sep - 23 Sep	LOT
15 Sep - 22 Sep	LOT
12 Sep - 19 Sep	LOT
29 Sep - 06 Oct	British Airways	direct
29 Sep - 12 Oct	British Airways	direct
15 Sep - 19 Oct	British Airways	direct
02 Sep - 22 Oct	LOT
28 Sep - 11 Oct	LOT

Also check the deals for one-way flights from London to Riga 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 Riga in September from 116€

Return flights