Cheap flights from San Francisco to Hanoi from $423

The cheapest month to fly to Hanoi from San Francisco is in April. Flight prices, which tend to average around $778, are often lower during this time because this is during the off-season. If you’re not able to fly to Hanoi in April, then March is your next best option. Flight prices from San Francisco to Hanoi during March average around $807.

You are more likely to see cheaper flights to Hanoi from San Francisco when booking weeks ahead of your departure date. In general, you can expect to find flights to Hanoi for around $943 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Hanoi from San Francisco for as low as $761 on momondo.

You could potentially save up to 9% on your flight if you consider stops on a San Francisco to Hanoi flight.

As of November 2026, prices for San Francisco to Hanoi flights are approximately 31% cheaper when compared to flights at the same time last year.

Korean Air, Delta, and United Airlines are the most popular carriers operating from San Francisco to Hanoi Noibai

Asiana Airlines, China Airlines and Cathay Pacific are the top three most popular airlines that fly to Hanoi from San Francisco according to our data. Asiana Airlines is the first choice among our users, with 33% of people opting to fly with this airline when traveling to Hanoi. Keep in mind that there are 13 different airlines that fly to Hanoi on a routine basis, so you have a few additional options to choose from.

Taipei City (TPE) was the most common stop: 40% of momondo users choosing 1-stop flights on this route connected there.

Flights via Guangzhou (CAN) offer the lowest average round-trip price of $493.

Flights connecting via Taipei City (TPE) have the shortest average one-way travel time: 20h 34m.

Ho Chi Minh City (SGN) has the shortest average layover time for this route: 2h 15m.