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Cheap flights from Illinois to Siem Reap from $541

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 1/17. 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
2:35 pm - 9:15 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
29h 40m2 stops Hong Kong Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
7:25 pm - 12:55 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
30h 30m2 stops Bangkok Suvarnabhumi Hong Kong Intl
$1,027Multiple Airlines
Sat, Nov 21 - Sun, Nov 29
Etihad Airways Logo
2:00 pm - 9:00 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
31h 00m2 stops Abu Dhabi Zayed Intl Bangkok Suvarnabhumi
Etihad Airways Logo
7:35 pm - 8:35 amSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
49h 00m2 stops Bangkok Suvarnabhumi Abu Dhabi Zayed Intl
$1,334Etihad Airways
Sun, Aug 23 - Sat, Aug 29
Multiple Airlines Logo
2:00 pm - 11:10 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
33h 10m3 stops Abu Dhabi Zayed Intl Chennai Bangkok Don Mueang Intl
Multiple Airlines Logo
11:50 pm - 9:10 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
33h 20m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,491Multiple Airlines
Sun, Aug 23 - Sat, Aug 29
Multiple Airlines Logo
1:10 pm - 2:25 pmORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
36h 15m2 stops Abu Dhabi Zayed Intl Phnom Penh Techo Intl
Multiple Airlines Logo
10:25 pm - 7:35 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
34h 10m3 stops Phnom Penh Techo Intl Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$1,519Multiple Airlines
Sat, Nov 21 - Sun, Nov 29
Multiple Airlines Logo
2:00 pm - 11:10 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
33h 10m3 stops Abu Dhabi Zayed Intl Chennai Bangkok Don Mueang Intl
Multiple Airlines Logo
10:35 pm - 9:10 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
34h 35m3 stops Ho Chi Minh City Da Nang Taipei City Taiwan Taoyuan Intl
$1,799Multiple Airlines
Sun, Aug 23 - Sat, Aug 29
Multiple Airlines Logo
6:30 pm - 8:45 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
25h 15m3 stops Reykjavik Keflavik Intl Kastrup Copenhagen Bangkok Suvarnabhumi
Multiple Airlines Logo
10:25 pm - 7:35 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
34h 10m3 stops Phnom Penh Techo Intl Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$2,013Multiple Airlines
Sat, Nov 21 - Sun, Nov 29
Multiple Airlines Logo
10:35 am - 9:55 amORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
34h 20m3 stops Amman Queen Alia Intl Dubai Intl Singapore Changi
Multiple Airlines Logo
4:00 pm - 2:55 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
35h 55m2 stops Ho Chi Minh City Dubai Intl
$2,417Multiple Airlines
Sat, Dec 26 - Sat, Jan 2
Multiple Airlines Logo
11:30 pm - 6:45 pmORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
30h 15m2 stops Taipei City Taiwan Taoyuan Intl Bangkok Suvarnabhumi
Multiple Airlines Logo
9:55 am - 7:35 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
22h 40m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$2,485Multiple Airlines
Sat, Dec 26 - Sat, Jan 2
Multiple Airlines Logo
11:30 pm - 4:10 pmORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
27h 40m3 stops Taipei City Taiwan Taoyuan Intl Hanoi Noibai Luang Prabang
Multiple Airlines Logo
9:55 am - 7:35 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
22h 40m2 stops Bangkok Suvarnabhumi Taipei City Taiwan Taoyuan Intl
$2,547Multiple Airlines
Sat, Dec 26 - Sat, Jan 2
Multiple Airlines Logo
11:30 pm - 5:40 pmORD  Chicago O'Hare Intl-SAI Siem Reap–Angkor Intl
29h 10m2 stops Taipei City Taiwan Taoyuan Intl Ho Chi Minh City
Multiple Airlines Logo
10:00 am - 7:35 pmSAI  Siem Reap–Angkor Intl-ORD Chicago O'Hare Intl
22h 35m2 stops Ho Chi Minh City Taipei City Taiwan Taoyuan Intl
$2,561Multiple Airlines
Fri, Dec 25 - Sat, Jan 2

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Emirates flights from Illinois to Siem Reap

Our best Emirates deals on Illinois to Siem Reap flight tickets
Emirates
Nov 1
ORD7:30 amChicago O'Hare Intl
48h 40m
3 stops
SAI9:10 pmSiem Reap–Angkor Intl
May 11
SAI11:50 pmSiem Reap–Angkor Intl
36h 25m
3 stops
ORD12:15 amChicago O'Hare Intl
$10,070
Emirates
Nov 1
ORD2:20 pmChicago O'Hare Intl
41h 50m
3 stops
SAI9:10 pmSiem Reap–Angkor Intl
May 11
SAI11:50 pmSiem Reap–Angkor Intl
30h 22m
3 stops
ORD6:12 pmChicago O'Hare Intl
$24,509

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 August 13, 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 Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 11/21

2:35 pm-9:15 am

2 stops29h 40m

Siem Reap–Angkor Intl

Sun 11/29

7:25 pm-12:55 pm

2 stops30h 30m

$1,027

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sun 8/23

2:00 pm-9:00 am

2 stops31h 00m

Siem Reap–Angkor Intl

Sat 8/29

7:35 pm-8:35 am

2 stops49h 00m

$1,334

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sun 8/23

2:00 pm-11:10 am

3 stops33h 10m

Siem Reap–Angkor Intl

Sat 8/29

11:50 pm-9:10 pm

2 stops33h 20m

$1,491

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 11/21

1:10 pm-2:25 pm

2 stops36h 15m

Siem Reap–Angkor Intl

Sun 11/29

10:25 pm-7:35 pm

3 stops34h 10m

$1,519

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sun 8/23

2:00 pm-11:10 am

3 stops33h 10m

Siem Reap–Angkor Intl

Sat 8/29

10:35 pm-9:10 pm

3 stops34h 35m

$1,799

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 11/21

6:30 pm-8:45 am

3 stops25h 15m

Siem Reap–Angkor Intl

Sun 11/29

10:25 pm-7:35 pm

3 stops34h 10m

$2,013

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 12/26

10:35 am-9:55 am

3 stops34h 20m

Siem Reap–Angkor Intl

Sat 1/2

4:00 pm-2:55 pm

2 stops35h 55m

$2,417

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 12/26

11:30 pm-6:45 pm

2 stops30h 15m

Siem Reap–Angkor Intl

Sat 1/2

9:55 am-7:35 pm

2 stops22h 40m

$2,485
Quickest round-trip

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Sat 12/26

11:30 pm-4:10 pm

3 stops27h 40m

Siem Reap–Angkor Intl

Sat 1/2

9:55 am-7:35 pm

2 stops22h 40m

$2,547

ChicagoSiem Reap

ORD Chicago O'Hare Intl - SAI Siem Reap–Angkor Intl

ORDSAI

Chicago O'Hare Intl

Fri 12/25

11:30 pm-5:40 pm

2 stops29h 10m

Siem Reap–Angkor Intl

Sat 1/2

10:00 am-7:35 pm

2 stops22h 35m

$2,561

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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

29h 10m

Direct flights

None
The fastest flight from Illinois to Siem Reap takes 29h 10m
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.

Frequently asked questions about flying from Illinois to Siem Reap

  • 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