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Cheap flights from Illinois to Siem Reap from $685

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Siem Reap departing on 8/23. 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
1 adult, Economy, 0 bags

Find the cheapest flights from Illinois to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
Multiple Airlines Logo
12:30 am - 9:00 am
ORD
-
SAI
44h 30m
2 stops
Multiple Airlines Logo
7:10 pm - 9:10 pm
SAI
-
ORD
38h 00m
2 stops
$1,483Multiple Airlines
Thu, Aug 13 - Sun, Aug 23
Multiple Airlines Logo
8:25 pm - 11:15 am
ORD
-
SAI
26h 50m
2 stops
Multiple Airlines Logo
9:40 am - 3:40 pm
SAI
-
ORD
42h 00m
2 stops
$1,572Multiple Airlines
Mon, Aug 17 - Sat, Aug 22
Etihad Airways Logo
2:00 pm - 9:00 am
ORD
-
SAI
31h 00m
2 stops
Etihad Airways Logo
12:55 pm - 8:35 am
SAI
-
ORD
31h 40m
2 stops
$1,608Etihad Airways
Tue, Jul 21 - Tue, Jul 28
Emirates Logo
8:35 pm - 12:15 pm
ORD
-
SAI
27h 40m
2 stops
Emirates Logo
11:50 pm - 11:26 pm
SAI
-
ORD
35h 36m
3 stops
$1,657Emirates
Mon, Aug 17 - Sat, Aug 22
Multiple Airlines Logo
12:30 am - 6:55 pm
ORD
-
SAI
30h 25m
2 stops
Multiple Airlines Logo
9:35 am - 5:41 am
SAI
-
ORD
32h 06m
3 stops
$1,663Multiple Airlines
Thu, Aug 13 - Sun, Aug 23
Etihad Airways Logo
8:25 pm - 6:55 pm
ORD
-
SAI
34h 30m
2 stops
Etihad Airways Logo
12:55 pm - 8:35 am
SAI
-
ORD
31h 40m
2 stops
$1,708Etihad Airways
Wed, Jul 29 - Sat, Aug 8
Multiple Airlines Logo
2:00 pm - 11:10 am
ORD
-
SAI
33h 10m
3 stops
Multiple Airlines Logo
10:35 pm - 9:10 pm
SAI
-
ORD
34h 35m
3 stops
$1,812Multiple Airlines
Mon, Aug 17 - Sat, Aug 22
Multiple Airlines Logo
7:20 pm - 9:00 am
ORD
-
SAI
25h 40m
2 stops
Multiple Airlines Logo
10:35 pm - 9:10 pm
SAI
-
ORD
34h 35m
3 stops
$1,920Multiple Airlines
Wed, Jul 29 - Sat, Aug 8
Multiple Airlines Logo
7:20 pm - 6:55 pm
ORD
-
SAI
35h 35m
2 stops
Multiple Airlines Logo
3:10 pm - 2:20 pm
SAI
-
ORD
35h 10m
3 stops
$1,923Multiple Airlines
Tue, Jul 21 - Tue, Jul 28
Multiple Airlines Logo
2:00 pm - 11:10 am
ORD
-
SAI
33h 10m
3 stops
Multiple Airlines Logo
10:35 pm - 9:10 pm
SAI
-
ORD
34h 35m
3 stops
$1,945Multiple Airlines
Fri, Aug 14 - Sun, Aug 23

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Etihad Airways flights from Illinois to Siem Reap

Our best Etihad Airways deals on Illinois to Siem Reap flight tickets
Etihad Airways
Jul 21
ORD2:00 pmChicago O'Hare Intl
31h 00m
2 stops
SAI9:00 amSiem Reap–Angkor Intl
Jul 28
SAI12:55 pmSiem Reap–Angkor Intl
31h 40m
2 stops
ORD8:35 amChicago O'Hare Intl
$1,608
Etihad Airways
Jul 29
ORD8:25 pmChicago O'Hare Intl
34h 30m
2 stops
SAI6:55 pmSiem Reap–Angkor Intl
Aug 8
SAI12:55 pmSiem Reap–Angkor Intl
31h 40m
2 stops
ORD8:35 amChicago O'Hare Intl
$1,708

momondo Fare Finder

 
Customize your flight search to find flights from Illinois 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 June 25, 2026.
Use the filters below to find and compare flights from Illinois to Siem Reap that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Thu 8/13

12:30 am-9:00 am

2 stops44h 30m

Siem Reap–Angkor Intl

Sun 8/23

7:10 pm-9:10 pm

2 stops38h 00m

$1,483

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 8/17

8:25 pm-11:15 am

2 stops26h 50m

Siem Reap–Angkor Intl

Sat 8/22

9:40 am-3:40 pm

2 stops42h 00m

$1,572

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Tue 7/21

2:00 pm-9:00 am

2 stops31h 00m

Siem Reap–Angkor Intl

Tue 7/28

12:55 pm-8:35 am

2 stops31h 40m

$1,608

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 8/17

8:35 pm-12:15 pm

2 stops27h 40m

Siem Reap–Angkor Intl

Sat 8/22

11:50 pm-11:26 pm

3 stops35h 36m

$1,657

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Thu 8/13

12:30 am-6:55 pm

2 stops30h 25m

Siem Reap–Angkor Intl

Sun 8/23

9:35 am-5:41 am

3 stops32h 06m

$1,663

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Wed 7/29

8:25 pm-6:55 pm

2 stops34h 30m

Siem Reap–Angkor Intl

Sat 8/8

12:55 pm-8:35 am

2 stops31h 40m

$1,708

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Mon 8/17

2:00 pm-11:10 am

3 stops33h 10m

Siem Reap–Angkor Intl

Sat 8/22

10:35 pm-9:10 pm

3 stops34h 35m

$1,812
Quickest round-trip

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Wed 7/29

7:20 pm-9:00 am

2 stops25h 40m

Siem Reap–Angkor Intl

Sat 8/8

10:35 pm-9:10 pm

3 stops34h 35m

$1,920

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Tue 7/21

7:20 pm-6:55 pm

2 stops35h 35m

Siem Reap–Angkor Intl

Tue 7/28

3:10 pm-2:20 pm

3 stops35h 10m

$1,923

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Fri 8/14

2:00 pm-11:10 am

3 stops33h 10m

Siem Reap–Angkor Intl

Sun 8/23

10:35 pm-9:10 pm

3 stops34h 35m

$1,945

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 Illinois 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 Illinois to Siem Reap–Angkor Intl?

Singapore Airlines is the most popular carrier operating from Illinois to Siem Reap–Angkor Intl

Cheap Illinois to Siem Reap flight deals and tips

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

Fastest flight time

31h 00m

Direct flights

None
The fastest flight from Illinois to Siem Reap takes 31h 00m
There are no direct flights from Illinois to Siem Reap. There are no popular flight routes from Illinois to Siem Reap.
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Frequently asked questions about flying from Illinois to Siem Reap

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

    Prices for flights from Illinois to Siem Reap–Angkor Intl Airport were last updated today.

  • How old do you have to be to fly from Illinois 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 Illinois 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 Illinois to Siem Reap?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Siem Reap from Illinois.

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

momondo does allow users to show only those flights to Siem Reap from Illinois which offer a flexible booking policy as well as other useful filters and features.

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

Once all potential Illinois to Siem Reap flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

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

Of course. momondo tracks the price of Illinois to Siem Reap flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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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