Cheapest one-way flights from London to Helsinki in September from $43

Best time to book flights for London (STN) to Helsinki (HEL) flights at AirHint

AirHint found the following cheapest one-way flights from London (STN) to Helsinki (HEL) in September 2025 (see full year).

One-Way flights

30 Sep Ryanair direct
17 Sep Ryanair direct
23 Sep Ryanair direct
22 Sep Ryanair direct
09 Sep Ryanair direct
12 Sep Ryanair direct
01 Sep Ryanair direct
15 Sep Ryanair direct

Also check the deals for return flights from London to Helsinki in September.

Skyscanner

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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