AirHint found the following cheapest return flights from Mexico City (MEX) to Helsinki (HEL) in September 2025 (see full year).

Return flights

10 Sep - 06 Oct	Volaris
07 Sep - 20 Sep	Volaris
18 Sep - 05 Oct	Viva
09 Sep - 20 Sep	Viva
08 Sep - 04 Oct	Aeromexico
13 Sep - 28 Sep	Volaris
09 Sep - 18 Sep	British Airways
08 Sep - 15 Sep	Viva
23 Sep - 16 Oct	Finnair
12 Sep - 23 Sep	KLM
23 Sep - 23 Oct	Air France
09 Sep - 25 Sep	Air France
09 Sep - 23 Sep	Air France
09 Sep - 22 Sep	Air France
06 Sep - 16 Sep	KLM

Also check the deals for one-way flights from Mexico City to Helsinki 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 Mexico City to Helsinki in September from 752€

Return flights