Which airports can I use when flying from St. Louis to Phnom Penh?

Flights from St. Louis to Phnom Penh usually depart from Lambert-St Louis (STL) and arrive at Phnom Penh Techo Intl (KTI).

What cabin classes can I book on flights from St. Louis to Phnom Penh?

Only Economy Class is available on flights from St. Louis to Phnom Penh.

Can I save money by using flexible dates for flights from St. Louis to Phnom Penh?

Yes. Flexible dates can save you up to 54% on flights from St. Louis to Phnom Penh. Sunday is the cheapest departure day at $1,081 round-trip on average, while Saturday is the most expensive at $2,329, a difference of $1,248. Cheaper weekend fares like these are typical of routes dominated by weekday business travel.

Do I need a passport to fly from St. Louis to Phnom Penh?

Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.

Have flight prices from St. Louis to Phnom Penh changed much recently?

Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $1,176 to $11,627. That means the highest observed fare was about 10x higher than the lowest one.

How are flight prices from St. Louis to Phnom Penh looking right now?

One-way fares from St. Louis to Phnom Penh are currently higher than usual. Average one-way flight prices are about $1,162, which is 21% above the typical average for this route.

What is the time difference between St. Louis and Phnom Penh?

Phnom Penh is 12 hours ahead of St. Louis (Indochina Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

How much should I expect to pay for a St. Louis to Phnom Penh flight?

Round-trip flights from St. Louis to Phnom Penh range from $1,081 to $1,248, with an average of $1,245 over the past 12 months. Anything below $1,081 counts as a good deal.

Which airline is the cheapest to fly from St. Louis to Phnom Penh?

Qatar Airways ($1,496) and Lufthansa ($2,208) are the cheapest airlines to fly round-trip from St. Louis to Phnom Penh according to KAYAK data over the last 5 days.

Cheap Flights from St. Louis to Phnom Penh | KAYAK

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Cheapest round-trip

$1,176

Typical prices: $1,081-$1,248

Multiple Airlines

Mon 2/19Tue 3/6

STL - KTI • 2 stops

Cheapest one-way

$1,156

Typical prices: $697-$1,375

Multiple Airlines

Tue 12/25

STL - KTI • 2 stops

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Flight Deals

Cheap Flights from St. Louis to Phnom Penh (STL-KTI)

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Recent round-trip flight deals from St. Louis to Phnom Penh

Fri, Feb 19 - Sat, Mar 6

7:23 am - 10:25 amSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

38h 02m2 stops Chicago O'Hare Intl Hong Kong Intl

11:45 am - 8:22 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

45h 37m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,176Multiple Airlines

Sat, Nov 28 - Mon, Dec 14

5:29 pm - 10:25 amSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

51h 56m2 stops Chicago O'Hare Intl Hong Kong Intl

7:05 pm - 4:40 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

34h 35m2 stops Hong Kong Intl Seattle/Tacoma Intl

$1,227Multiple Airlines

Tue, Dec 1 - Tue, Dec 15

6:00 am - 10:25 amSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

39h 25m2 stops Los Angeles Hong Kong Intl

7:05 pm - 10:17 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

40h 12m2 stops Hong Kong Intl Chicago O'Hare Intl

$1,281Multiple Airlines

Fri, Feb 19 - Sat, Mar 6

2:24 pm - 3:25 pmSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

36h 01m3 stops Dallas/Fort Worth Doha Hamad Intl Ho Chi Minh City

5:10 pm - 9:09 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

40h 59m3 stops Ho Chi Minh City Doha Hamad Intl Philadelphia

$1,496Qatar Airways

Sat, Nov 28 - Mon, Dec 14

7:30 am - 2:35 pmSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

42h 05m3 stops Chicago O'Hare Intl Istanbul Bangkok Suvarnabhumi

7:15 pm - 7:45 amKTI Phnom Penh Techo Intl-STL Lambert-St Louis

49h 30m3 stops Bangkok Suvarnabhumi Istanbul Detroit Metropolitan Wayne County

$1,563Multiple Airlines

Tue, Dec 1 - Tue, Dec 15

6:02 am - 3:25 pmSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

44h 23m3 stops Philadelphia Doha Hamad Intl Ho Chi Minh City

5:10 pm - 6:26 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

38h 16m3 stops Ho Chi Minh City Doha Hamad Intl Dallas/Fort Worth

$1,564Qatar Airways

Sat, Nov 28 - Mon, Dec 14

6:50 pm - 7:35 pmSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

35h 45m3 stops Chicago O'Hare Intl Munich Franz Josef Strauss Bangkok Suvarnabhumi

7:40 pm - 1:45 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

55h 05m2 stops Singapore Changi Frankfurt am Main

$2,208Lufthansa

Tue, Dec 1 - Tue, Dec 15

1:18 pm - 7:25 pmSTL Lambert-St Louis-KTI Phnom Penh Techo Intl

41h 07m3 stops Chicago O'Hare Intl Munich Franz Josef Strauss Bangkok Suvarnabhumi

7:40 pm - 1:45 pmKTI Phnom Penh Techo Intl-STL Lambert-St Louis

31h 05m2 stops Singapore Changi Frankfurt am Main

$3,282Lufthansa

Booking Insights

Price, demand and travel trends for St. Louis to Phnom Penh flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

Which airline is the cheapest to fly from St. Louis to Phnom Penh?: Qatar Airways ($1,496) and Lufthansa ($2,208) are the cheapest airlines to fly round-trip from St. Louis to Phnom Penh according to KAYAK data over the last 5 days.

Find deals

Cheapest flight	$1,156

One-way flight from St. Louis to Phnom Penh

When to book flights from St. Louis to Phnom Penh

Are your dates flexible? Find out the best times to travel from St. Louis to Phnom Penh based on our flight data from the last year. Discover the cheapest month and even day to fly.

Estimated round-trip price

KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

What cabin classes can I book on flights from St. Louis to Phnom Penh?
Only Economy Class is available on flights from St. Louis to Phnom Penh.
Do I need a passport to fly from St. Louis to Phnom Penh?
Yes, a valid passport is required for this international route. Many destinations require at least six months of validity beyond your travel dates. Check your passport expiry well before booking.
How much should I expect to pay for a St. Louis to Phnom Penh flight?
Round-trip flights from St. Louis to Phnom Penh range from $1,081 to $1,248, with an average of $1,245 over the past 12 months. Anything below $1,081 counts as a good deal.
Have flight prices from St. Louis to Phnom Penh changed much recently?
Yes. Based on fares seen in the past 5 days, round-trip prices on this route showed a wide range, from about $1,176 to $11,627. That means the highest observed fare was about 10x higher than the lowest one.
How are flight prices from St. Louis to Phnom Penh looking right now?
One-way fares from St. Louis to Phnom Penh are currently higher than usual. Average one-way flight prices are about $1,162, which is 21% above the typical average for this route.
Which airports can I use when flying from St. Louis to Phnom Penh?
Flights from St. Louis to Phnom Penh usually depart from Lambert-St Louis (STL) and arrive at Phnom Penh Techo Intl (KTI).
Can I save money by using flexible dates for flights from St. Louis to Phnom Penh?
Yes. Flexible dates can save you up to 54% on flights from St. Louis to Phnom Penh. Sunday is the cheapest departure day at $1,081 round-trip on average, while Saturday is the most expensive at $2,329, a difference of $1,248.

Cheaper weekend fares like these are typical of routes dominated by weekday business travel.
What is the time difference between St. Louis and Phnom Penh?
Phnom Penh is 12 hours ahead of St. Louis (Indochina Time vs Central Time). Plan for the time shift when scheduling connections or first-day activities.

If your dates are flexible, aim for a Sunday departure and avoid flying on Saturday. On this route, Sunday flights average $1,081, about $1,248 less than Saturday fares (54% savings) based on the last 12 months.

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STL - KTI

$1,156 Find Cheap Flights from St. Louis to Phnom Penh - Compare and Save

Everything you should know

Cheap Flights from St. Louis to Phnom Penh (STL-KTI)

Recent round-trip flight deals from St. Louis to Phnom Penh

Recent one-way flight deals from St. Louis to Phnom Penh

Price, demand and travel trends for St. Louis to Phnom Penh flights

Which airline is the cheapest to fly from St. Louis to Phnom Penh?

Key details for St. Louis to Phnom Penh flights

Cheapest flight

When to book flights from St. Louis to Phnom Penh

Your St. Louis to Phnom Penh flight questions, answered

Your guide to booking St. Louis to Phnom Penh flights

More options for your flight from St. Louis to Phnom Penh

Complete your trip to Phnom Penh with a hotel stay or car rental

Information on your arrival and departure airports

Cabin class types available on flights from St. Louis to Phnom Penh

Find direct flights to and from St. Louis and Phnom Penh

Flights from domestic origins to Phnom Penh

Flights to other popular destinations