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Cheap flights from Missouri to Siem Reap from $815

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Missouri to Siem Reap departing on 4/27. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Find the cheapest flights from Missouri to Siem Reap

Cheap one-way flights

Enter your travel dates to find the best prices.
Qatar Airways Logo
2:33 pm - 12:20 pm
STL
-
SAI
33h 47m
3 stops
$815Qatar Airways
Mon, Apr 27
Qatar Airways Logo
4:30 pm - 6:45 pm
STL
-
SAI
38h 15m
3 stops
$817Qatar Airways
Mon, Apr 27
Qatar Airways Logo
4:30 pm - 6:45 pm
STL
-
SAI
38h 15m
3 stops
$839Qatar Airways
Mon, Apr 27
Qatar Airways Logo
4:30 pm - 6:45 pm
STL
-
SAI
38h 15m
3 stops
$849Qatar Airways
Mon, Apr 27
Qatar Airways Logo
4:30 pm - 6:45 pm
STL
-
SAI
38h 15m
3 stops
$855Qatar Airways
Mon, Apr 27
Multiple Airlines Logo
4:46 pm - 9:40 am
STL
-
SAI
52h 54m
2 stops
$1,278Multiple Airlines
Mon, Apr 27
Singapore Airlines Logo
4:46 pm - 9:40 am
STL
-
SAI
52h 54m
2 stops
$1,294Singapore Airlines
Mon, Apr 27

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Customize your flight search to find flights from Missouri to Siem Reap that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated April 19, 2026.
Use the filters below to find and compare flights from Missouri to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest one-way
Quickest one-way

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

2:33 pm-12:20 pm

3 stops33h 47m

$815

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:30 pm-6:45 pm

3 stops38h 15m

$817

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:30 pm-6:45 pm

3 stops38h 15m

$839

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:30 pm-6:45 pm

3 stops38h 15m

$849

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:30 pm-6:45 pm

3 stops38h 15m

$855

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:46 pm-9:40 am

2 stops52h 54m

$1,278

St. LouisSiem Reap

STL - SAI

STLSAI

Lambert-St Louis

Mon 4/27

4:46 pm-9:40 am

2 stops52h 54m

$1,294

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

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How to get the cheapest flight ticket from Missouri to Siem Reap

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest airline that flies from Missouri to Siem Reap–Angkor Intl?

Qatar Airways is the most popular carrier operating from Missouri to Siem Reap–Angkor Intl

Cheap Missouri to Siem Reap flight deals and tips

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

Fastest flight time

39h 41m

Direct flights

None
The fastest flight from Missouri to Siem Reap takes 39h 41m
There are no direct flights from Missouri to Siem Reap. There are no popular flight routes from Missouri to Siem Reap.
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Frequently asked questions about flying from Missouri to Siem Reap

  • When did momondo last update prices for flights from Missouri to Siem Reap–Angkor Intl Airport?

    Prices for flights from Missouri to Siem Reap–Angkor Intl Airport refresh daily.

  • How old do you have to be to fly from Missouri to Siem Reap–Angkor Intl Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Missouri 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 required for your trip to Siem Reap–Angkor Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Siem Reap–Angkor Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

Why use momondo?

Why should I use momondo to find a flight deal from Missouri to Siem Reap?

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

Can I find flights from Missouri to Siem Reap with flexible booking policies on momondo?

Yes. All flights to Siem Reap from Missouri on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights from Missouri to Siem Reap?

momondo provides multiple filters to help you find the best flight to Siem Reap from Missouri. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Siem Reap from Missouri are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Cabin classes currently available on flights to Siem Reap

List of cabin classes available on flights landing in Siem Reap. Availability may vary depending on flight origin and airline.
First Class to Siem Reap
Business Class to Siem Reap