$407 Find Cheap Flights from San Francisco to Siem Reap - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from San Francisco to Siem Reap departing on 8/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap San Francisco to Siem Reap Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from San Francisco to Siem Reap that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from San Francisco to Siem Reap

Mon, Sep 28 - Mon, Oct 26
Singapore Airlines Logo
11:45 am - 9:40 am
SFO
-
SAI
31h 55m
1 stop
Singapore Airlines Logo
10:45 am - 8:50 am
SAI
-
SFO
36h 05m
1 stop
$799Singapore Airlines
Thu, Oct 1 - Sun, Oct 11
Singapore Airlines Logo
11:45 am - 9:40 am
SFO
-
SAI
31h 55m
1 stop
Singapore Airlines Logo
10:30 am - 9:50 am
SAI
-
SFO
37h 20m
1 stop
$800Singapore Airlines
Sat, Nov 7 - Sun, Nov 15
Singapore Airlines Logo
9:40 am - 3:55 pm
SFO
-
SAI
39h 15m
1 stop
Singapore Airlines Logo
10:45 am - 7:50 am
SAI
-
SFO
36h 05m
1 stop
$864Singapore Airlines
Fri, Oct 9 - Sun, Oct 11
Singapore Airlines Logo
11:45 am - 9:40 am
SFO
-
SAI
31h 55m
1 stop
Singapore Airlines Logo
4:00 pm - 9:50 am
SAI
-
SFO
31h 50m
1 stop
$865Singapore Airlines
Fri, Oct 9 - Sat, Oct 17
Singapore Airlines Logo
11:45 am - 3:10 pm
SFO
-
SAI
37h 25m
1 stop
Singapore Airlines Logo
10:30 am - 9:50 am
SAI
-
SFO
37h 20m
1 stop
$882Singapore Airlines
Sat, Oct 10 - Sat, Oct 17
Singapore Airlines Logo
11:45 am - 9:40 am
SFO
-
SAI
31h 55m
1 stop
Singapore Airlines Logo
10:30 am - 9:50 am
SAI
-
SFO
37h 20m
1 stop
$920Singapore Airlines
Wed, Sep 30 - Sun, Oct 11
Multiple Airlines Logo
12:20 am - 6:55 pm
SFO
-
SAI
28h 35m
2 stops
Multiple Airlines Logo
12:55 pm - 10:40 pm
SAI
-
SFO
23h 45m
2 stops
$935Multiple Airlines
Sun, Sep 27 - Mon, Oct 26
Multiple Airlines Logo
12:20 am - 6:55 pm
SFO
-
SAI
28h 35m
2 stops
Multiple Airlines Logo
1:20 pm - 10:15 pm
SAI
-
SFO
22h 55m
2 stops
$989Multiple Airlines
Fri, Nov 27 - Tue, Dec 22
Singapore Airlines Logo
9:40 am - 3:55 pm
SFO
-
SAI
39h 15m
1 stop
Singapore Airlines Logo
10:45 am - 7:50 am
SAI
-
SFO
36h 05m
1 stop
$992Singapore Airlines
Fri, Nov 27 - Tue, Dec 22
Singapore Airlines Logo
9:40 am - 3:55 pm
SFO
-
SAI
39h 15m
1 stop
Singapore Airlines Logo
10:45 am - 7:50 am
SAI
-
SFO
36h 05m
1 stop
$993Singapore Airlines
Booking Insights

KAYAK's insights & trends for San Francisco to Siem Reap flights

Get data-powered insights and trends into flights from San Francisco to Siem Reap to help you find the cheapest flights, the best time to fly and much more.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from San Francisco to Siem Reap, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from San Francisco to Siem Reap is June, when tickets cost $0 (return) on average. On the other hand, the most expensive months are December and October, when the average cost of round-trip tickets is $7,154 and $1,290 respectively.

Good to know

Low seasonSeptember
Best time to beat the crowds with an average 64% drop in price.
Most popular time to fly and prices are also 53% lower on average.

FAQs - booking Siem Reap flights

  • How does KAYAK find such low prices on flights from San Francisco to Siem Reap?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from San Francisco to Siem Reap.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from San Francisco to Siem Reap?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from San Francisco to Siem Reap is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from San Francisco to Siem Reap?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from San Francisco to Siem Reap with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from San Francisco to Siem Reap?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from San Francisco to Siem Reap up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airlines flying from San Francisco to Siem Reap

 
See real verified KAYAK customer reviews for airlines flying from San Francisco to Siem Reap. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from San Francisco to Siem Reap? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.2
Singapore AirlinesOverall score based on 1559 reviews
8.1Entertainment
7.8Food
8.6Crew
8.0Comfort
8.3Boarding
Airline reviews

I had selected seats together for my family of three when I first booked my tickets in February. However, I realized only when I checked in at the airport that the seats I had selected were no longer assigned to us and we were completely scattered across three different middle seats instead of being seated together! After requesting the Singapore staff to have us seated together on a full flight, they managed to find something but it was right next to the rest rooms and the whole journey of 15+ hours was really unpleasant. They said that the seat selection isn't locked and the airline can reallocate the seats anytime. No one ever told us this and it was a terribly unpleasant surprise. Will avoid Kayak/underpricer and Singapore in future

2.0 MediocreAnonymous, Jun 2026
SFO - SIN
Read more Singapore Airlines reviews

I had selected seats together for my family of three when I first booked my tickets in February. However, I realized only when I checked in at the airport that the seats I had selected were no longer assigned to us and we were completely scattered across three different middle seats instead of being seated together! After requesting the Singapore staff to have us seated together on a full flight, they managed to find something but it was right next to the rest rooms and the whole journey of 15+ hours was really unpleasant. They said that the seat selection isn't locked and the airline can reallocate the seats anytime. No one ever told us this and it was a terribly unpleasant surprise. Will avoid Kayak/underpricer and Singapore in future

Very concerned with guest comforts going out of their way to accommodate special dietary needs when the guests hadn’t pre-ordered.

Crew and service excellent. 2 hour delay for takeoff. SQ app showed flight on time.

Flight from SFO did not include entertainment as it was not working the entire duration of the flight. Was informed that there would be a $350 voucher for the inconvenience. Uncertain how the voucher will be provided.

The food options and quality could use some more excitement and variety.

On time boarding I would like to see ground hostess to help transit customers to direct them to the right terminal and boarding gate. Last night, all the transit customers on SQ484 arriving Singapore had to merry go round to look for terminal and boarding gate to board SQ128 transit to KL Malaysia. We went to Terminal 3 taking the Skytrain to T3 and back to T3 to get out to look for different Skytrain to T2. On arrival t2, we had to go round to ask which boarding gate to KL. We only had 5 minutes to make to the boarding time at 6:55pm but we already spent more than 30 minutes running around to find the boarding gate. We were late at the boarding gate.

Leg room and flight sound insulation is very bad. They broke 3 of my bags with bad handling

I commend the flight attendants on our SFO-SIN flight who went above and beyond to provide us with extra snacks and food. This type of service makes the flight experience personal and awesome.

People were so nice! Economy seats were small and cramped feeling for me. I’m slender and 6 feet tall

The singapore airline now compared before covid, I like the service before covid. SQ was the best of all airlines but now I am going to look for different airline if I am travelling in asia.

Really good 👍 This was our first time flying with Vietnam Airlines. It was a short domestic flight, so no meal service, but boarding was organized and the flight departed and arrived on schedule. The flight attendants were professional and neatly presented. All in all, a very good first experience. We would recommend Vietnam Airlines.

The flight boarded and departed pretty much on time as it’s just a one hour flight there is no food or entertainment so I marked that at the neutral but they do offer water and I’m sure if you needed some food you could bring your own onboard. This was our third internal flight with Vietnam Airways and I recommend them.

Food and welcome services were good , however we experienced issues with the entertainment system and poor headsets

Lovely staff, comfortable seats. Transit time was short but they had great processes in place to get us on the plane.

2 hours delay, time changes started already 2 days before the flight

I bought the front row seat and made and early online check in but they changed my seat to the back row without prior notice. The inflight meal was too poor, only a piece of small finger food. The boarding is a disaster, everyone is stuffed in a bus in chaos. Doesnt worth the money at all.

The plane had a technical problem it would delayed 10 hours but they just gave limited information and put all passengers into the Miracle lounge. Ther were not enough chairs and so on.

An excellent airline; polite and courteous cabin crew, excellent meal and drink service. Highly recommended.

They didn't have a vegetarian food in spite of the ore order

VN661 flight, the A321 seats are starting to show heavy sign of wear and tear

Everything you need to know for your flight from San Francisco to Siem Reap

Information on your arrival and departure airports