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Cheap flights from St. Louis to Siem Reap from $1,589

1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from St. Louis to Siem Reap

Cheap round-trip flights

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Qatar Airways Logo
11:01 am - 12:15 pmSTL  Lambert-St Louis-SAI Siem Reap–Angkor Intl
37h 14m3 stops Chicago O'Hare Intl Doha Hamad Intl Bangkok Suvarnabhumi
Qatar Airways Logo
7:35 pm - 8:44 pmSAI  Siem Reap–Angkor Intl-STL Lambert-St Louis
37h 09m3 stops Bangkok Suvarnabhumi Doha Hamad Intl Chicago O'Hare Intl
$1,589Qatar Airways
Thu, Sep 17 - Thu, Sep 24
Multiple Airlines Logo
8:41 am - 9:40 amSTL  Lambert-St Louis-SAI Siem Reap–Angkor Intl
36h 59m2 stops San Francisco Singapore Changi
Multiple Airlines Logo
7:35 pm - 6:43 pmSAI  Siem Reap–Angkor Intl-STL Lambert-St Louis
59h 08m2 stops Bangkok Suvarnabhumi Los Angeles
$1,935Multiple Airlines
Thu, Sep 17 - Thu, Sep 24
Multiple Airlines Logo
12:59 pm - 5:10 pmSTL  Lambert-St Louis-SAI Siem Reap–Angkor Intl
64h 11m3 stops Chicago O'Hare Intl Tokyo Narita Hanoi Noibai
Multiple Airlines Logo
12:55 pm - 12:40 pmSAI  Siem Reap–Angkor Intl-STL Lambert-St Louis
35h 45m2 stops Bangkok Suvarnabhumi Los Angeles
$2,635Multiple Airlines
Thu, Sep 17 - Thu, Sep 24

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Use the filters below to find and compare flights from St. Louis to Siem Reap that are best for you.

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Quickest round-trip

St. LouisSiem Reap

STL Lambert-St Louis - SAI Siem Reap–Angkor Intl

STLSAI

Lambert-St Louis

Thu 9/17

11:01 am-12:15 pm

3 stops37h 14m

Siem Reap–Angkor Intl

Thu 9/24

7:35 pm-8:44 pm

3 stops37h 09m

$1,589

St. LouisSiem Reap

STL Lambert-St Louis - SAI Siem Reap–Angkor Intl

STLSAI

Lambert-St Louis

Thu 9/17

8:41 am-9:40 am

2 stops36h 59m

Siem Reap–Angkor Intl

Thu 9/24

7:35 pm-6:43 pm

2 stops59h 08m

$1,935

St. LouisSiem Reap

STL Lambert-St Louis - SAI Siem Reap–Angkor Intl

STLSAI

Lambert-St Louis

Thu 9/17

12:59 pm-5:10 pm

3 stops64h 11m

Siem Reap–Angkor Intl

Thu 9/24

12:55 pm-12:40 pm

2 stops35h 45m

$2,635

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to Siem Reap

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Siem Reap according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Siem Reap (STL to SAI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Siem Reap

Best Price Found

$1,589

Fastest flight time

33h 40m

Direct flights

None
The best flight deal from St. Louis to Siem Reap found on momondo in the last 72 hours is $1,589
The fastest flight from St. Louis to Siem Reap takes 33h 40m
There are no direct flights from St. Louis to Siem Reap. There are no popular flight routes from St. Louis to Siem Reap.
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Frequently asked questions about flying from St. Louis to Siem Reap

  • How far is Lambert-St Louis to Siem Reap–Angkor Intl by plane?

    A flight from Lambert-St Louis to Siem Reap–Angkor Intl will travel around 8725.9 mi. By plane, this route typically takes 33h 40m.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Siem Reap–Angkor Intl Airport?

    Prices for flights from Lambert-St Louis Airport to Siem Reap–Angkor Intl Airport are updated daily.

  • How old do you have to be to fly from Lambert-St Louis Airport to Siem Reap–Angkor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Siem Reap–Angkor Intl Airport.

  • What documentation or ID do you need to fly to Siem Reap–Angkor Intl Airport?

    The travel and health documents you'll need for your trip to Siem Reap–Angkor Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Frequently asked questions about flying from St. Louis to Siem Reap

  • How do I get Price Alerts for flights from St. Louis to Siem Reap?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to St. Louis from Siem Reap. Flight offers will be shown to you in real-time. From there you can create a Price Alert by using our on-site widget.

  • How can I save money on flights from St. Louis to Siem Reap with momondo?

    With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

  • How does momondo find its flight prices?

    We show prices from over 700+ competitors with a single click. With options from airlines and OTAs from across our 30 international markets, we are able to show you a diverse range of deals to create your adventure.

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Siem Reap?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Siem Reap. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Siem Reap with flexible booking policies on momondo?

Flights from St. Louis to Siem Reap with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from St. Louis to Siem Reap?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from St. Louis to Siem Reap.

I’m not ready to book a flight from St. Louis to Siem Reap right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Siem Reap from St. Louis. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

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