Question 1

What are the cheapest airlines flying from San Francisco to Siem Reap round-trip?

Accepted Answer

Flying on Singapore Airlines is currently your cheapest option to Siem Reap, with prices starting at $628. Another option worth looking into is Vietnam Airlines, starting at $756 round trip. These flights start at 58% lower than the current average price 3 months from now.

Question 2

What is the cheapest day to fly from San Francisco to Siem Reap?

Accepted Answer

Travelers seeking maximum savings on their San Francisco to Siem Reap flight should consider departing on Monday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Question 3

E

Accepted Answer

In terms of precipitation, rainfall in Siem Reap ranges from 0.0 - 10.2 inches per month. September is typically the wettest month, when rainfall can reach 10.2 in. January is typically the driest time to visit Siem Reap when rainfall is around 0.0 in.

Question 4

E

Accepted Answer

If weather is an important factor for your trip to Siem Reap, use this chart to help with planning. For those seeking warmer temperatures, April is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 75.2 F).

Question 5

What is the cheapest day to fly round-trip from San Francisco to Siem Reap?

Accepted Answer

Flying to your destination on a Thursday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Siem Reap. Check prices with Cheapflights to find a great deal for your trip.

Question 6

What is the cheapest month to fly from San Francisco to Siem Reap?

Accepted Answer

Due to multiple factors, expect to potentially pay more when booking in May. For low rates, January can be a great choice for travel to Siem Reap. Flights to Siem Reap from San Francisco in January are about $1,519 on average during January, but can be found for as low as $611.

Question 7

What is the cheapest time of day to fly from SFO to SAI?

Accepted Answer

It’s optimal to fly from San Francisco to Siem Reap in the morning. By choosing this option you can save up to 34% on the cost of your flight, compared to a flight at noon.

Question 8

Can I find deals for flights from San Francisco to Siem Reap that include hotel bookings?

Accepted Answer

Yes. In addition to deals on San Francisco to Siem Reap flights, Cheapflights offers vacation packages that include both flights and hotel.

Question 9

How can I find direct flights from San Francisco to Siem Reap?

Accepted Answer

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Siem Reap.

Question 10

Can I find deals for business class flights from San Francisco to Siem Reap?

Accepted Answer

Yes. Cheapflights offers flight deals from San Francisco to Siem Reap by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

Popular in	May
Cheapest in	January
Average price	$768

Airline	Cheapest	Average	Flexibility	On-time
Singapore Airlines	Cheapest$649	Average$735	FlexibilityNo cancel fee	On-time81%
Vietnam Airlines	Cheapest$756	Average$1,022	FlexibilityNo cancel fee	On-time81%

Find cheap flights from San Francisco to Siem Reap with Cheapflights

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Cheap flight deals from San Francisco to Siem Reap

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Average price

Best time to book a flight from San Francisco to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from San Francisco with our price prediction graph.

Reviews of airlines servicing Siem Reap

Peruse reviews from past customers who have flown with Singapore Airlines and Vietnam Airlines from San Francisco to Siem Reap to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from San Francisco to Siem Reap round-trip?

Can I find deals for flights from San Francisco to Siem Reap that include hotel bookings?

How can I find direct flights from San Francisco to Siem Reap?

Can I find deals for business class flights from San Francisco to Siem Reap?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Siem Reap by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from San Francisco to Siem Reap by cabin class

Find flights from San Francisco to Siem Reap, based on your preferred cabin class, be it economy, premium economy, business, or first class.

San Francisco and Siem Reap flights

Browse other San Francisco and Siem Reap flight options. Last updated on August 31, 2025.

Other flights from San Francisco

Browse through other flights departing from San Francisco. Flights are based on user searches made on Cheapflights and were last updated on August 31, 2025.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2025

Top 2 airlines flying from San Francisco to Siem Reap

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Cheap flights from San Francisco (SFO) to Siem Reap, Cambodia (SAI)

Find cheap flights from San Francisco to Siem Reap with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from San Francisco to Siem Reap

Popular in

Cheapest in

Average price

Best time to book a flight from San Francisco to Siem Reap

Have a flexible travel schedule? Discover the best time to fly to Siem Reap from San Francisco with our price prediction graph.

Reviews of airlines servicing Siem Reap

Peruse reviews from past customers who have flown with Singapore Airlines and Vietnam Airlines from San Francisco to Siem Reap to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Siem Reap. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What are the cheapest airlines flying from San Francisco to Siem Reap round-trip?

Can I find deals for flights from San Francisco to Siem Reap that include hotel bookings?

How can I find direct flights from San Francisco to Siem Reap?

Can I find deals for business class flights from San Francisco to Siem Reap?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Complete your trip

Complete your trip to Siem Reap by adding a car rental and/or hotel reservation to your travel itinerary.

Top 2 airlines flying from San Francisco to Siem Reap

100% Free

Book with Flexibility

Travel Smart