16 hr 35 min is the shortest flight time from San Francisco to Singapore.

The cheapest days to fly are usually in September. Typical prices range from $770 to $970.

The best round-trip deal recently found on Google Flights from San Francisco to Singapore was with Philippine Airlines from $795. The best one-way deal was with Frontier, XiamenAir from $438.

There are direct flights from San Francisco to Singapore on a daily basis.

Singapore Airlines and United fly direct from San Francisco to Singapore.

The cheapest round-trip flight from San Francisco to Singapore starts at $795 from Thu, Nov 7 to Wed, Nov 20. The cheapest one-way flight starts at $438 and departs on Tue, Nov 5.

The weather's warm and tropical year-round. Rainstorms are possible at any time, but rainfall usually peaks Nov–Dec. Chinatown comes alive for Chinese New Year (varies Jan/Feb), celebrated with parades, lights and traditional lion dances, including at the large, multicultural Chingay Parade. The Singapore Formula 1 Grand Prix (Sep) is staged at the Marina Bay circuit. There are music concerts and other events in the run-up to the race.

It's easy to use Google Flights to find the cheapest days to fly from San Francisco to Singapore.
Just click the Departure label near the top of the page to open the calendar. Choose a start date and a return date to see how the round-trip fare changes on those specific days.
Adjust the trip type to see one-way fares. The cheapest available flights are highlighted and easy to spot. Once you settle on dates, click the Search button to see flight options and book the deal.

You can also turn on price tracking to get alerts if the price changes for a route or flight.