AirHint found the following cheapest return flights from San Francisco (SFO) to Monterrey (MTY) in September 2025 (see full year).

Return flights

26 Sep - 28 Sep	United	direct
13 Sep - 16 Sep	Aeromexico
27 Sep - 08 Oct	Delta
26 Sep - 03 Oct	Delta
27 Sep - 04 Oct	Delta
27 Sep - 08 Oct	United	direct
13 Sep - 16 Sep	United	direct
27 Sep - 04 Oct	United	direct
26 Sep - 03 Oct	United	direct

Also check the deals for one-way flights from San Francisco to Monterrey 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 San Francisco to Monterrey in September from $237

Return flights