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

Return flights

09 Sep - 16 Sep	Korean Air
15 Sep - 22 Sep	Korean Air
09 Sep - 23 Sep	Korean Air
23 Sep - 07 Oct	Korean Air
30 Sep - 21 Oct	Korean Air
09 Sep - 07 Oct	Korean Air
16 Sep - 23 Sep	Korean Air
23 Sep - 21 Oct	Korean Air
09 Sep - 24 Sep	China Airlines
17 Sep - 01 Oct	China Airlines
17 Sep - 24 Sep	China Airlines
24 Sep - 08 Oct	China Airlines
29 Sep - 20 Oct	China Airlines
09 Sep - 03 Oct	China Airlines
17 Sep - 03 Oct	China Airlines
24 Sep - 05 Oct	China Airlines
09 Sep - 26 Sep	China Airlines

Also check the deals for one-way flights from San Jose 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 Jose to Hanoi in September from $842

Return flights