$325 Find Cheap Flights from San Francisco to Siem Reap

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 4/21. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Siem Reap

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Siem Reap, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from San Francisco to Siem Reap, as well as popular online travel agencies
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Flight Deals

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

Wed, Apr 29 - Tue, May 12
Singapore Airlines Logo
11:00 am - 3:10 pm
SFO
-
SAI
38h 10m
1 stop
Singapore Airlines Logo
10:30 am - 9:10 am
SAI
-
SFO
36h 40m
1 stop
$598Singapore Airlines
Wed, Apr 1 - Thu, Apr 30
Singapore Airlines Logo
11:00 am - 3:10 pm
SFO
-
SAI
38h 10m
1 stop
Singapore Airlines Logo
10:30 am - 9:10 am
SAI
-
SFO
36h 40m
1 stop
$643Singapore Airlines
Wed, Apr 29 - Tue, May 12
Singapore Airlines Logo
7:40 pm - 3:10 pm
SFO
-
SAI
29h 30m
2 stops
Singapore Airlines Logo
10:30 am - 9:10 am
SAI
-
SFO
36h 40m
1 stop
$794Singapore Airlines
Wed, Apr 1 - Thu, Apr 30
Singapore Airlines Logo
11:00 am - 3:10 pm
SFO
-
SAI
38h 10m
1 stop
Singapore Airlines Logo
10:30 am - 9:10 am
SAI
-
SFO
36h 40m
1 stop
$837Singapore Airlines
Wed, Apr 29 - Tue, May 12
Vietnam Airlines Logo
10:50 pm - 4:25 pm
SFO
-
SAI
27h 35m
3 stops
Vietnam Airlines Logo
7:40 pm - 5:55 pm
SAI
-
SFO
36h 15m
1 stop
$892Vietnam Airlines
Tue, Mar 24 - Mon, Mar 30
Singapore Airlines Logo
10:40 am - 3:55 pm
SFO
-
SAI
39h 15m
1 stop
Singapore Airlines Logo
10:30 am - 9:10 am
SAI
-
SFO
36h 40m
1 stop
$898Singapore Airlines
Wed, Apr 1 - Thu, Apr 30
Singapore Airlines Logo
11:00 am - 3:10 pm
SFO
-
SAI
38h 10m
1 stop
Singapore Airlines Logo
10:30 am - 7:40 am
SAI
-
SFO
35h 10m
2 stops
$899Singapore Airlines
Wed, Apr 29 - Thu, May 14
Multiple Airlines Logo
12:50 am - 6:45 pm
SFO
-
SAI
27h 55m
2 stops
Multiple Airlines Logo
9:40 am - 8:30 pm
SAI
-
SFO
24h 50m
2 stops
$922Multiple Airlines
Sat, Mar 14 - Tue, Mar 24
Vietnam Airlines Logo
10:10 pm - 5:30 pm
SFO
-
SAI
29h 20m
1 stop
Vietnam Airlines Logo
9:30 pm - 6:00 pm
SAI
-
SFO
34h 30m
1 stop
$926Vietnam Airlines
Wed, Apr 1 - Thu, Apr 30
Vietnam Airlines Logo
10:50 pm - 6:40 pm
SFO
-
SAI
29h 50m
1 stop
Vietnam Airlines Logo
6:05 pm - 5:55 pm
SAI
-
SFO
61h 50m
2 stops
$941Vietnam 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.

Which airlines provide the cheapest flights from San Francisco to Siem Reap?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from San Francisco to Siem Reap were found on Singapore Airlines ($598) and China Eastern ($677).

Good to know

Low seasonApril
Best time to beat the crowds with an average 57% drop in price.
Most popular time to fly and prices are also 49% 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 1443 reviews
8.3Boarding
8.0Comfort
7.8Food
8.6Crew
8.0Entertainment
Airline reviews

First time flying with Singapore airlines and I’ll give them two thumbs up 👍 👍

10.0 ExcellentSuzanne, Jan 2026
SIN - SGN
Read more Singapore Airlines reviews

First time flying with Singapore airlines and I’ll give them two thumbs up 👍 👍

I wish there was a little more leg room between the seats. The recline was good and seats overall were comfortable. I also didn’t like the 2-4-2 configuration.

toilets could be cleaned more frequently, everything else was pretty good.

The flight crew was phenominal! We couldn't have asked for any better. They were experienced professionals.

Wish the underseat compartment don’t have a restriction, can fit a personal item such as backpack fully like most Boeing

Airline should consider adding a small meal at the last leg of the flight, right now there is 7 hours of no meal break.

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

Headwind delayed our flight which wasn’t the airlines fault

The food wasn’t good at all. I skipped meals .

Very good flight from Boarding to landing -efficient and comfortable with decent entertainment options

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.

This is a very short commuter flight, so there is no food or flight entertainment. Hence, I marked it in the neutral flight left on time. The plane was full pretty much and it was a pretty easy flight overall very good.

The flight crew and attendants are very professional and polite.

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

Very good flight and very kind crew Only thing is I wish there would be a vegetarian option for the meals

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

For a domestic flight, seats are ok, but fir us as tall dutchies, the legroom is too small. However, for a short and affordable flight, is not a big problem. Staff is still very nice and a complementary water very welcome.

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

Average, not more then that. Cannot compete with Singapore Airlines

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.

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

Information on your arrival and departure airports