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Cheap flights from Chicago O'Hare Intl Airport to Siem Reap from $521

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to Siem Reap departing on 3/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Chicago O'Hare Intl Airport to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
10:45 pm - 9:40 am
ORD
-
SAI
46h 55m
2 stops
United Airlines Logo
10:30 am - 3:15 pm
SAI
-
ORD
64h 45m
2 stops
$1,098United Airlines
Sun, Apr 19 - Sun, May 10
United Airlines Logo
9:10 am - 9:40 am
ORD
-
SAI
36h 30m
2 stops
United Airlines Logo
10:30 am - 12:59 am
SAI
-
ORD
50h 29m
2 stops
$1,099United Airlines
Mon, Apr 20 - Mon, Jun 22
Singapore Airlines Logo
8:31 am - 3:10 pm
ORD
-
SAI
42h 39m
3 stops
Singapore Airlines Logo
10:30 am - 11:59 pm
SAI
-
ORD
49h 29m
2 stops
$1,119Singapore Airlines
Mon, Apr 20 - Mon, Jun 22
Multiple Airlines Logo
12:30 am - 9:00 am
ORD
-
SAI
44h 30m
2 stops
Multiple Airlines Logo
7:10 pm - 9:00 pm
SAI
-
ORD
61h 50m
2 stops
$1,153Multiple Airlines
Sat, Apr 18 - Sun, May 10
Multiple Airlines Logo
12:30 am - 4:25 pm
ORD
-
SAI
27h 55m
3 stops
Multiple Airlines Logo
7:10 pm - 9:00 pm
SAI
-
ORD
37h 50m
2 stops
$1,213Multiple Airlines
Sat, Apr 18 - Sun, May 10
Multiple Airlines Logo
8:10 pm - 12:15 pm
ORD
-
SAI
28h 05m
2 stops
Multiple Airlines Logo
7:30 pm - 9:40 am
SAI
-
ORD
50h 10m
2 stops
$1,270Multiple Airlines
Sat, Apr 11 - Sun, Apr 26
Multiple Airlines Logo
2:10 pm - 2:25 pm
ORD
-
SAI
36h 15m
2 stops
Multiple Airlines Logo
1:00 pm - 8:35 am
SAI
-
ORD
55h 35m
2 stops
$1,301Multiple Airlines
Sat, Mar 28 - Sun, Apr 5
Multiple Airlines Logo
2:00 pm - 10:50 am
ORD
-
SAI
32h 50m
2 stops
Multiple Airlines Logo
7:10 pm - 8:35 am
SAI
-
ORD
49h 25m
2 stops
$1,305Multiple Airlines
Sat, Apr 11 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 4:25 pm
ORD
-
SAI
51h 55m
3 stops
Multiple Airlines Logo
7:30 pm - 9:00 pm
SAI
-
ORD
37h 30m
2 stops
$1,359Multiple Airlines
Fri, Apr 10 - Sun, Apr 26
Multiple Airlines Logo
2:00 pm - 11:10 am
ORD
-
SAI
33h 10m
3 stops
Multiple Airlines Logo
2:50 pm - 9:40 am
SAI
-
ORD
30h 50m
3 stops
$1,482Multiple Airlines
Mon, Apr 20 - Mon, Jun 22

Singapore Airlines flights from Chicago O'Hare Intl Airport to Siem Reap

Our best Singapore Airlines deals on Chicago O'Hare Intl Airport to Siem Reap flight tickets
Singapore Airlines
Apr 20
ORD8:31 amChicago O'Hare Intl
42h 39m
3 stops
SAI3:10 pmSiem Reap–Angkor Intl
Jun 22
SAI10:30 amSiem Reap–Angkor Intl
49h 29m
2 stops
ORD11:59 pmChicago O'Hare Intl
$1,119
Singapore Airlines
Apr 11
ORD7:45 amChicago O'Hare Intl
37h 55m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
Apr 26
SAI10:30 amSiem Reap–Angkor Intl
57h 11m
3 stops
ORD7:41 amChicago O'Hare Intl
$1,931
Singapore Airlines
Apr 11
ORD7:45 amChicago O'Hare Intl
37h 55m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Apr 26
SAI10:30 amSiem Reap–Angkor Intl
57h 11m
3 stops
ORD7:41 amChicago O'Hare Intl
$1,983

United Airlines flights from Chicago O'Hare Intl Airport to Siem Reap

Our best United Airlines deals on Chicago O'Hare Intl Airport to Siem Reap flight tickets
United Airlines
Apr 19
ORD10:45 pmChicago O'Hare Intl
46h 55m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 10
SAI10:30 amSiem Reap–Angkor Intl
64h 45m
2 stops
ORD3:15 pmChicago O'Hare Intl
$1,098
United Airlines
Apr 20
ORD9:10 amChicago O'Hare Intl
36h 30m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
Jun 22
SAI10:30 amSiem Reap–Angkor Intl
50h 29m
2 stops
ORD12:59 amChicago O'Hare Intl
$1,099
United Airlines
Mar 13
ORD6:17 amChicago O'Hare Intl
39h 33m
2 stops
SAI9:50 amSiem Reap–Angkor Intl
Mar 22
SAI10:45 amSiem Reap–Angkor Intl
46h 51m
2 stops
ORD9:36 pmChicago O'Hare Intl
$1,867

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport 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 March 2, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sun 4/19

10:45 pm-9:40 am

2 stops46h 55m

Siem Reap–Angkor Intl

Sun 5/10

10:30 am-3:15 pm

2 stops64h 45m

$1,098

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 4/20

9:10 am-9:40 am

2 stops36h 30m

Siem Reap–Angkor Intl

Mon 6/22

10:30 am-12:59 am

2 stops50h 29m

$1,099

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 4/20

8:31 am-3:10 pm

3 stops42h 39m

Siem Reap–Angkor Intl

Mon 6/22

10:30 am-11:59 pm

2 stops49h 29m

$1,119

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 4/18

12:30 am-9:00 am

2 stops44h 30m

Siem Reap–Angkor Intl

Sun 5/10

7:10 pm-9:00 pm

2 stops61h 50m

$1,153

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 4/18

12:30 am-4:25 pm

3 stops27h 55m

Siem Reap–Angkor Intl

Sun 5/10

7:10 pm-9:00 pm

2 stops37h 50m

$1,213

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 4/11

8:10 pm-12:15 pm

2 stops28h 05m

Siem Reap–Angkor Intl

Sun 4/26

7:30 pm-9:40 am

2 stops50h 10m

$1,270

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 3/28

2:10 pm-2:25 pm

2 stops36h 15m

Siem Reap–Angkor Intl

Sun 4/5

1:00 pm-8:35 am

2 stops55h 35m

$1,301

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 4/11

2:00 pm-10:50 am

2 stops32h 50m

Siem Reap–Angkor Intl

Sun 4/26

7:10 pm-8:35 am

2 stops49h 25m

$1,305

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Fri 4/10

12:30 am-4:25 pm

3 stops51h 55m

Siem Reap–Angkor Intl

Sun 4/26

7:30 pm-9:00 pm

2 stops37h 30m

$1,359

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 4/20

2:00 pm-11:10 am

3 stops33h 10m

Siem Reap–Angkor Intl

Mon 6/22

2:50 pm-9:40 am

3 stops30h 50m

$1,482

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Siem Reap from

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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 Chicago O'Hare Intl to Siem Reap–Angkor Intl?

United Airlines is the most popular carrier operating from Chicago O'Hare Intl to Siem Reap–Angkor Intl

When to book flights from Chicago O'Hare Intl Airport to Siem Reap

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

Cheap Chicago O'Hare Intl Airport to Siem Reap (ORD to SAI) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Siem Reap

Fastest flight time

28h 05m

Direct flights

None
The fastest flight from Chicago O'Hare Intl Airport to Siem Reap takes 28h 05m
There are no direct flights from Chicago O'Hare Intl Airport to Siem Reap. There are no popular flight routes from Chicago O'Hare Intl Airport to Siem Reap.
Search flight deals

  • How far is Chicago O'Hare Intl to Siem Reap–Angkor Intl by plane?

    A flight from Chicago O'Hare Intl to Siem Reap–Angkor Intl will travel around 8534.8 mi. In terms of flight time, this usually takes a little over 28h 05m.

  • When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Siem Reap–Angkor Intl Airport?

    Prices for flights from Chicago O'Hare Intl Airport to Siem Reap–Angkor Intl Airport refresh daily.

  • How old do you have to be to fly from Chicago O'Hare Intl Airport to Siem Reap–Angkor Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Siem Reap–Angkor Intl Airport.

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

    The required travel and health documents for your Siem Reap–Angkor Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Siem Reap–Angkor Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Chicago to Siem Reap for you.

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

Yes. momondo allows you to filter the results for Chicago to Siem Reap flights to just show those with flexible booking policies.

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

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Siem Reap from Chicago.

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

Price alerts on flights to Siem Reap from Chicago 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