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

Return flights

08 Sep - 15 Sep	Asiana Airlines
10 Sep - 17 Sep	Asiana Airlines
14 Sep - 23 Sep	Asiana Airlines
09 Sep - 16 Sep	Asiana Airlines
10 Sep - 08 Oct	United
22 Sep - 30 Sep	Korean Air
27 Sep - 14 Oct	Philippine Airlines
20 Sep - 10 Oct	Philippine Airlines

Also check the deals for one-way flights from San Francisco to Hanoi 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.

Book a cheap hotel in Hanoi

Cheap car rent in Hanoi

Cheapest return flights from San Francisco to Hanoi in September from 590€

Return flights