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Cheap flights from Illinois to Siem Reap from $560

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 3/5. 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

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Find the cheapest flights from Illinois to Siem Reap

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
9:31 pm - 9:40 am
ORD
-
SAI
48h 09m
2 stops
United Airlines Logo
10:30 am - 5:25 am
SAI
-
ORD
30h 55m
2 stops
$1,099United Airlines
Sun, May 10 - Mon, May 18
Multiple Airlines Logo
12:30 am - 5:10 pm
ORD
-
SAI
28h 40m
2 stops
Multiple Airlines Logo
7:40 pm - 9:00 pm
SAI
-
ORD
61h 20m
2 stops
$1,201Multiple Airlines
Fri, Apr 10 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 5:10 pm
ORD
-
SAI
52h 40m
2 stops
Multiple Airlines Logo
7:40 pm - 9:00 pm
SAI
-
ORD
37h 20m
2 stops
$1,238Multiple Airlines
Fri, Apr 10 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 3:10 pm
ORD
-
SAI
26h 40m
2 stops
Multiple Airlines Logo
7:40 pm - 9:00 pm
SAI
-
ORD
37h 20m
2 stops
$1,244Multiple Airlines
Fri, Apr 10 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 4:25 pm
ORD
-
SAI
51h 55m
3 stops
Multiple Airlines Logo
7:40 pm - 9:00 pm
SAI
-
ORD
37h 20m
2 stops
$1,248Multiple Airlines
Fri, Apr 10 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 4:25 pm
ORD
-
SAI
27h 55m
3 stops
Multiple Airlines Logo
9:40 am - 9:00 pm
SAI
-
ORD
23h 20m
2 stops
$1,275Multiple Airlines
Sat, May 9 - Mon, May 18
Multiple Airlines Logo
3:50 pm - 2:10 pm
ORD
-
SAI
34h 20m
3 stops
Multiple Airlines Logo
11:30 am - 6:46 am
SAI
-
ORD
31h 16m
3 stops
$1,605Multiple Airlines
Sun, May 10 - Mon, May 18
Multiple Airlines Logo
8:35 pm - 12:15 pm
ORD
-
SAI
27h 40m
2 stops
Multiple Airlines Logo
12:15 pm - 3:45 pm
SAI
-
ORD
39h 30m
3 stops
$1,704Multiple Airlines
Sat, Apr 11 - Sun, Apr 26
Multiple Airlines Logo
12:30 am - 12:40 pm
ORD
-
SAI
48h 10m
2 stops
Multiple Airlines Logo
9:30 pm - 8:35 pm
SAI
-
ORD
35h 05m
2 stops
$1,821Multiple Airlines
Thu, Mar 12 - Sun, Mar 22
Multiple Airlines Logo
12:30 am - 8:55 pm
ORD
-
SAI
32h 25m
2 stops
Multiple Airlines Logo
9:40 pm - 8:35 pm
SAI
-
ORD
34h 55m
2 stops
$1,822Multiple Airlines
Thu, Mar 12 - Sun, Mar 22

United Airlines flights from Illinois to Siem Reap

Our best United Airlines deals on Illinois to Siem Reap flight tickets
United Airlines
Feb 7
ORD7:58 pmChicago O'Hare Intl
54h 57m
2 stops
SAI3:55 pmSiem Reap–Angkor Intl
Feb 24
SAI4:45 pmSiem Reap–Angkor Intl
26h 34m
2 stops
ORD6:19 amChicago O'Hare Intl
$1,094
United Airlines
May 10
ORD9:31 pmChicago O'Hare Intl
48h 09m
2 stops
SAI9:40 amSiem Reap–Angkor Intl
May 18
SAI10:30 amSiem Reap–Angkor Intl
30h 55m
2 stops
ORD5:25 amChicago O'Hare Intl
$1,099

Singapore Airlines flights from Illinois to Siem Reap

Our best Singapore Airlines deals on Illinois to Siem Reap flight tickets
Singapore Airlines
Mar 13
ORD6:45 amChicago O'Hare Intl
45h 10m
3 stops
SAI3:55 pmSiem Reap–Angkor Intl
Mar 22
SAI10:45 amSiem Reap–Angkor Intl
48h 11m
3 stops
ORD10:56 pmChicago O'Hare Intl
$2,137
Singapore Airlines
Apr 11
ORD8:15 amChicago O'Hare Intl
37h 25m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Apr 26
SAI4:00 pmSiem Reap–Angkor Intl
51h 41m
3 stops
ORD7:41 amChicago O'Hare Intl
$2,200
Singapore Airlines
Apr 11
ORD8:15 amChicago O'Hare Intl
37h 25m
3 stops
SAI9:40 amSiem Reap–Angkor Intl
Apr 26
SAI4:00 pmSiem Reap–Angkor Intl
51h 41m
3 stops
ORD7:41 amChicago O'Hare Intl
$2,327

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 February 7, 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

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sun 5/10

9:31 pm-9:40 am

2 stops48h 09m

Siem Reap–Angkor Intl

Mon 5/18

10:30 am-5:25 am

2 stops30h 55m

$1,099

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Fri 4/10

12:30 am-5:10 pm

2 stops28h 40m

Siem Reap–Angkor Intl

Sun 4/26

7:40 pm-9:00 pm

2 stops61h 20m

$1,201

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Fri 4/10

12:30 am-5:10 pm

2 stops52h 40m

Siem Reap–Angkor Intl

Sun 4/26

7:40 pm-9:00 pm

2 stops37h 20m

$1,238

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Fri 4/10

12:30 am-3:10 pm

2 stops26h 40m

Siem Reap–Angkor Intl

Sun 4/26

7:40 pm-9:00 pm

2 stops37h 20m

$1,244

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

7:40 pm-9:00 pm

2 stops37h 20m

$1,248

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 5/9

12:30 am-4:25 pm

3 stops27h 55m

Siem Reap–Angkor Intl

Mon 5/18

9:40 am-9:00 pm

2 stops23h 20m

$1,275

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sun 5/10

3:50 pm-2:10 pm

3 stops34h 20m

Siem Reap–Angkor Intl

Mon 5/18

11:30 am-6:46 am

3 stops31h 16m

$1,605

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Sat 4/11

8:35 pm-12:15 pm

2 stops27h 40m

Siem Reap–Angkor Intl

Sun 4/26

12:15 pm-3:45 pm

3 stops39h 30m

$1,704

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Thu 3/12

12:30 am-12:40 pm

2 stops48h 10m

Siem Reap–Angkor Intl

Sun 3/22

9:30 pm-8:35 pm

2 stops35h 05m

$1,821

ChicagoSiem Reap

ORD - SAI

ORDSAI

Chicago O'Hare Intl

Thu 3/12

12:30 am-8:55 pm

2 stops32h 25m

Siem Reap–Angkor Intl

Sun 3/22

9:40 pm-8:35 pm

2 stops34h 55m

$1,822

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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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

27h 40m

Direct flights

None
The fastest flight from Illinois to Siem Reap takes 27h 40m
There are no direct flights from Illinois to Siem Reap. There are no popular flight routes from Illinois to Siem Reap.
Search flight deals

  • 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.

  • How do I get Price Alerts for flights from Illinois to Siem Reap?

    You can take advantage of momondo’s Price Alerts by first searching for your flights to Illinois 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 Illinois to Siem Reap with momondo?

    Leverage our AI within our “Price Forecast” tool, which predicts if it’s better to book now or wait until prices decrease. You can strategically pick the best days to fly and save money on your trip by using our “Price Calendar” tool. “Explore” shows an overview of how much it costs to fly to anywhere from a selected city or airport. Our “Discover” content is a great option for travel inspiration and money-saving tips, while “Price Alerts” will update you when prices change, so you can book when fares are right.

  • How does momondo find its flight prices?

    We compare prices from 700+ competitors to help you find the price that works best for you. momondo operates in over 30 international markets, bringing you access to a wide range of fares and deals. Search for your travel using momondo for a diverse range of options from airlines and OTAs.

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