How long is the flight from Cardiff to Illinois?

There are many flights that can get you from Cardiff to Illinois in 18h 37m. Fly via Delta or KLM to get the fastest option. The distance between Cardiff and Illinois is about 3831 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

If weather is an important factor for your trip to Illinois, 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 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around -5.0 C).

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

When flying from Cardiff to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

What airport do you fly from for flights from Cardiff to Illinois?

If you book a flight to Illinois from Cardiff, you will be flying from Cardiff Wales, which is the city’s only airport. Cardiff Wales (CWL) is located 9.1 mi from the center of Cardiff.

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

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

How can I find direct flights from Cardiff to Illinois?

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

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

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

£401+ Cheap Flights from Cardiff to Illinois

Cheap flight deals from Cardiff to Illinois

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

Cheapest flights from Cardiff to Illinois
Explore the most affordable flight options available from Cardiff to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 November 2026.

Wed 9/1217:30 -

1 stop26h 55m

Tue 15/1213:35 -

2 stops14h 15m

Deal found 11/11£674

Wed 9/1210:20 -

2 stops28h 44m

Tue 15/1213:35 -

2 stops14h 15m

Deal found 11/11£680

Sun 6/1214:25 -

2 stops30h 30m

Sun 13/1215:55 -

1 stop10h 15m

Deal found 8/11£751

Sun 6/1210:20 -

2 stops18h 37m

Sun 13/1210:38 -

2 stops17h 12m

Deal found 8/11£763

Sun 6/1217:30 -

1 stop26h 55m

Sun 13/1216:25 -

1 stop11h 25m

Deal found 8/11£776

Thu 24/1217:30 -

3 stops29h 15m

Thu 31/1219:10 -

3 stops32h 40m

Deal found 9/11£853

Sat 26/1208:15 -

1 stop11h 55m

Sat 2/115:55 -

1 stop16h 00m

Deal found 11/11£901

Find flight deals from Cardiff to Illinois

Round-trip from	£674
One-way from	£401

KLM
9/12-15/12
3 total stops
41h 10m total
Cardiff to Illinois

Search Deals

6/12-31/12
3 total stops
32h 55m total
Cardiff to Illinois

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Sun 6/12

14:25-17:20

3 stops32h 55m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£401

Fastest return journey

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Tue 16/3

10:20-20:37

2 stops15h 17m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£479

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Tue 16/3

17:30-15:25

1 stop26h 55m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£479

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Tue 16/3

12:15-14:45

2 stops31h 30m

Chicago O'Hare Intl

Wed 31/12

00:00-07:00

Nonstop0h 00m

£598

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Wed 9/12

10:20-09:04

2 stops28h 44m

Chicago O'Hare Intl

Tue 15/12

13:35-09:50

2 stops14h 15m

£680

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Sun 6/12

10:20-22:57

2 stops18h 37m

Chicago O'Hare Intl

Sun 13/12

10:38-09:50

2 stops17h 12m

£763

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Wed 9/12

10:20-14:49

2 stops34h 29m

Chicago O'Hare Intl

Tue 15/12

13:35-17:00

2 stops21h 25m

£772

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Sun 6/12

17:30-14:25

1 stop26h 55m

Chicago O'Hare Intl

Sun 13/12

16:25-09:50

1 stop11h 25m

£776

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Fri 25/12

10:20-20:18

2 stops15h 58m

Chicago O'Hare Intl

Sun 27/12

08:05-09:50

2 stops19h 45m

£984

CardiffChicago

CWL Cardiff Wales - ORD Chicago O'Hare Intl

CWLORD

Cardiff Wales

Sat 26/12

10:20-20:28

2 stops16h 08m

Chicago O'Hare Intl

Sat 2/1

16:25-17:00

1 stop18h 35m

£1,016

Flights are sorted by cheapest return flights first.

Deals found on 8/11

Showing 1-10 of 13 resultsSorted by cheapest first

Best time to book a flight from Cardiff to Illinois

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

CWL-ORD

Estimated return 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 Cardiff to Illinois

CWL-USIL

CWL-ORD

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

Reviews of airlines servicing Illinois

Get a feel of what it's like to fly with KLM from Cardiff to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

KLM

7.8

Good

1,599 reviews

Check prices

Reviews

1 / 20

8.0

Excellent

Kushal,Sept 2026

QRO - ATL

It was a nice one. Crew were friendly and helpful.

KLM

7.8

Good

1,599 reviews

KLM

7.8

Good

1,599 reviews

Check prices

Reviews

1 / 20

8.0

Excellent

Kushal,Sept 2026

QRO - ATL

It was a nice one. Crew were friendly and helpful.

Related info for your journey

What airport do you fly from for flights from Cardiff to Illinois?
If you book a flight to Illinois from Cardiff, you will be flying from Cardiff Wales, which is the city’s only airport. Cardiff Wales (CWL) is located 9.1 mi from the center of Cardiff.
How long is the flight from Cardiff to Illinois?
There are many flights that can get you from Cardiff to Illinois in 18h 37m. Fly via Delta or KLM to get the fastest option. The distance between Cardiff and Illinois is about 3831 mi. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.
Can I find deals for flights from Cardiff to Illinois that include hotel bookings?
Yes. In addition to deals on Cardiff to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Cardiff to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Cardiff to Illinois.
Can I find deals for business class flights from Cardiff to Illinois?
Yes. Cheapflights offers flight deals from Cardiff to Illinois 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

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Top airline flying from Cardiff to Illinois

Airline	Cheapest	Average	Flexibility	On-time
KLM	Cheapest£708	Average£712	FlexibilityNo cancel fee	On-time75%	Search KLM flights

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How does Cheapflights help users find flights from Cardiff to Illinois?

Deals for Cardiff to Illinois flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Cardiff to Illinois?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Cardiff to Illinois.

Can Cheapflights find flights from Cardiff to Illinois with no change fees?

Certainly. Search results for flights to Illinois from Cardiff shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Cardiff to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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Cheap flights from Cardiff to Illinois from £401

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/12. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Cardiff to Illinois

Cheapest flights from Cardiff to IllinoisExplore the most affordable flight options available from Cardiff to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 November 2026.

Explore the most affordable flight options available from Cardiff to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 November 2026.

Best flights from Cardiff to IllinoisDiscover carefully curated flight deals from Cardiff to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 November 2026.

Discover carefully curated flight deals from Cardiff to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 November 2026.

Last-minute flights from Cardiff to IllinoisDiscover last-minute flight deals from Cardiff to Illinois. Data last updated 13 November 2026 and is based on user searches.

Discover last-minute flight deals from Cardiff to Illinois. Data last updated 13 November 2026 and is based on user searches.

One-way flights from Cardiff to IllinoisSearch for one-way flight options from Cardiff to Illinois. Find affordable one-way fares based on user searches. Data last updated 13 November 2026.

Search for one-way flight options from Cardiff to Illinois. Find affordable one-way fares based on user searches. Data last updated 13 November 2026.

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

Best time to book a flight from Cardiff to Illinois

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

Cheapflights Insights

Reviews of airlines servicing Illinois

Get a feel of what it's like to fly with KLM from Cardiff to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Cardiff to Illinois?

How long is the flight from Cardiff to Illinois?

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

How can I find direct flights from Cardiff to Illinois?

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

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Cardiff to Illinois

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

Complete your trip

Complete your trip to Illinois by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to United States

Book a non-stop flight to one of these other cities located in United States.

Search flights from Cardiff to Illinois by cabin class

Find flights from Cardiff to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Cardiff and Illinois flights

Browse other Cardiff and Illinois flight options. Last updated on 13 November 2026.

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Cheapest flights from Cardiff to Illinois
Explore the most affordable flight options available from Cardiff to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 November 2026.

Best flights from Cardiff to Illinois
Discover carefully curated flight deals from Cardiff to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 November 2026.

Last-minute flights from Cardiff to Illinois
Discover last-minute flight deals from Cardiff to Illinois. Data last updated 13 November 2026 and is based on user searches.

One-way flights from Cardiff to Illinois
Search for one-way flight options from Cardiff to Illinois. Find affordable one-way fares based on user searches. Data last updated 13 November 2026.