In terms of precipitation, rainfall in Cheongju ranges from 1.1 - 10.8 inches per month. July is typically the wettest month, when rainfall can reach 10.8 in. December is typically the driest time to visit Cheongju when rainfall is around 1.1 in.

If weather is an important factor for your trip to Cheongju, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 77.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 26.6 F).

How far in advance should I book a flight from Illinois to Cheongju?

Find a great deal and save up to 3% by booking at least 41 days prior to your desired departure date, rather than waiting until the week of travel. According to our data, there are a number of flights available from Illinois to Cheongju within the next two weeks, with the cheapest ticket starting at $927.

What is the cheapest month to fly from Illinois to Cheongju?

January can be a great time to fly to Cheongju from Illinois with a flight ticket averaging about $1,487. Cheapflights users have found deals in the month of January for as cheap as $891. The most expensive prices can be found in the month of December.

What is the cheapest time of day to fly from IL to CJJ?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Cheongju as you normally would.

What airport do you fly into for flights to Cheongju from Illinois?

Located just 5.5 mi from the city center, Cheongju (CJJ) is the airport most travelers will use when flying to Cheongju from Illinois.

Can I find deals for flights from Illinois to Cheongju that include hotel bookings?

Yes. In addition to deals on Illinois to Cheongju flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Illinois to Cheongju?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Cheongju.

Can I find deals for business class flights from Illinois to Cheongju?

Yes. Cheapflights offers flight deals from Illinois to Cheongju by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$1,340+ Flights from Illinois to Cheongju

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Cheap flight deals from Illinois to Cheongju

Round-trip from	$1,340 (Mytrip)
Popular in	December
Cheapest in	January
Average price	$1,697

From Illinois to Cheongju

Search Deals

Highest demand for flights based on searches. 5% potential increase in price ($86 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease ($58 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Find flight deals from Illinois to Cheongju

Cheapest flights from Illinois to Cheongju
Explore the most affordable flight options available from Illinois to Cheongju. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

Wed 8/1312:30 amORD - CJJ

2 stops30h 15mMultiple Airlines

Thu 8/217:25 amCJJ - ORD

3 stops35h 25mMultiple Airlines

Deal found 6/30

$1,356

Thu 9/254:00 pmORD - CJJ

1 stop24h 45mCathay Pacific

Thu 10/237:30 amCJJ - ORD

1 stop20h 55mCathay Pacific

Deal found 6/30

$2,234

Best flights from Illinois to Cheongju
Discover carefully curated flight deals from Illinois to Cheongju that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 1, 2025.

Thu 8/1412:30 amORD - CJJ

2 stops31h 25mMultiple Airlines

Fri 8/227:25 amCJJ - ORD

2 stops24h 49mMultiple Airlines

Deal found 7/1

$1,340

Thu 9/254:00 pmORD - CJJ

1 stop24h 45mCathay Pacific

Thu 10/237:30 amCJJ - ORD

1 stop20h 55mCathay Pacific

Deal found 6/30

$2,234

Last-minute flights from Illinois to Cheongju
Discover last-minute flight deals from Illinois to Cheongju. Data last updated July 1, 2025 and is based on user searches.

Tue 7/14:00 pmORD - CJJ

1 stop24h 45mCathay Pacific

Tue 7/87:30 amCJJ - ORD

1 stop20h 55mCathay Pacific

Deal found 7/1

$2,610

Thu 8/1412:30 amORD - CJJ

2 stops31h 25mMultiple Airlines

Fri 8/227:25 amCJJ - ORD

2 stops24h 49mMultiple Airlines

Deal found 7/1

$1,340

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Cheongju that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoCheongju

ORD - CJJ

ORDCJJ

Chicago O'Hare Intl

Wed 8/13

12:30 am-8:45 pm

2 stops30h 15m

Cheongju

Thu 8/21

7:25 am-4:50 am

3 stops35h 25m

$1,356

ChicagoCheongju

ORD - CJJ

ORDCJJ

Chicago O'Hare Intl

Thu 9/25

4:00 pm-6:45 am

1 stop24h 45m

Cheongju

Thu 10/23

7:30 am-2:25 pm

1 stop20h 55m

$2,234

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/30

Best time to book a flight from Illinois to Cheongju

Have a flexible travel schedule? Discover the best time to fly to Cheongju from Illinois with our price prediction graph.

Estimated round-trip price

Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Cheongju

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Cheongju

Read reviews from past customers who have flown Cathay Pacific from Illinois to Cheongju. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Cathay Pacific

7.6

Good

922 reviews

Reviews

1 / 20

10.0

Excellent

Douglas,Jun 2025

MNL - HKG

Flight attendant was very helpful in finding something simple to eat as opposed to a full meal. I appreciated her efforts to make it a comfortable flight.

Cathay Pacific

7.6

Good

922 reviews

Cathay Pacific

7.6

Good

922 reviews

Reviews

1 / 20

10.0

Excellent

Douglas,Jun 2025

MNL - HKG

Flight attendant was very helpful in finding something simple to eat as opposed to a full meal. I appreciated her efforts to make it a comfortable flight.

Related info for your journey

What airport do you fly into for flights to Cheongju from Illinois?
Located just 5.5 mi from the city center, Cheongju (CJJ) is the airport most travelers will use when flying to Cheongju from Illinois.
Can I find deals for flights from Illinois to Cheongju that include hotel bookings?
Yes. In addition to deals on Illinois to Cheongju flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Illinois to Cheongju?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Cheongju.
Can I find deals for business class flights from Illinois to Cheongju?
Yes. Cheapflights offers flight deals from Illinois to Cheongju by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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$1,340+ Cheap flights from Illinois to Cheongju (CJJ)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/14. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Illinois to Cheongju with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Illinois to Cheongju

Keep the following information in mind while searching for Illinois to Cheongju flight deals. Data was last updated July 1, 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Illinois to Cheongju

Cheapest flights from Illinois to CheongjuExplore the most affordable flight options available from Illinois to Cheongju. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

Explore the most affordable flight options available from Illinois to Cheongju. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Cheongju that are best for you.

Best time to book a flight from Illinois to Cheongju

Have a flexible travel schedule? Discover the best time to fly to Cheongju from Illinois with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Illinois to Cheongju

Reviews of airlines servicing Cheongju

Read reviews from past customers who have flown Cathay Pacific from Illinois to Cheongju. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Cheongju. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airport do you fly into for flights to Cheongju from Illinois?

Can I find deals for flights from Illinois to Cheongju that include hotel bookings?

How can I find direct flights from Illinois to Cheongju?

Can I find deals for business class flights from Illinois to Cheongju?

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Illinois to Cheongju

See prices for flight routes from nearby airports that may be better suited for you.

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Travel Smart

Cheapest flights from Illinois to Cheongju
Explore the most affordable flight options available from Illinois to Cheongju. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 1, 2025.