What are the cheapest airlines to fly from Northern Ireland to Illinois one-way?

To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at £613. British Airways flights start at £658 while deals on Delta start at £1,275 one-way.

What is the cheapest month to book a flight from Northern Ireland to Illinois?

Currently, January is the cheapest month in which you can book a flight from Northern Ireland to Illinois (average of £595). Flying from Northern Ireland to Illinois in July is currently the most expensive (average of £843). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest month to fly from Northern Ireland to Illinois?

September can be a great time to fly to Illinois from Northern Ireland with a flight ticket averaging about £737. Cheapflights users have found deals in the month of September for as cheap as £563. The most expensive prices can be found in the month of March.

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

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

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

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

How can I find direct flights from Northern Ireland to Illinois?

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

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

Yes. Cheapflights offers flight deals from Northern Ireland 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.

£257+ Flights from Northern Ireland to Illinois

Cheap flight deals from Northern Ireland to Illinois

Round-trip from	£502
One-way from	£257
Popular in	March
Cheapest in	September
Average price	£769

27/4-4/5
2 total stops
29h 30m total
Northern Ireland to Illinois

Search Deals

13/6
2 total stops
25h 40m total
Northern Ireland to Illinois

Search Deals

Highest demand for flights based on searches. 26% potential increase in price (£204 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 8% potential price decrease (£43 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Find flight deals from Northern Ireland to Illinois

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

Sun 27/406:50BHD - ORD

1 stop16h 10mMultiple Airlines

Sun 4/517:45ORD - BHD

1 stop13h 20mMultiple Airlines

Deal found 30/3£502

Wed 7/506:50BHD - ORD

1 stop13h 00mBritish Airways

Sun 11/517:40ORD - BHD

1 stop11h 50mBritish Airways

Deal found 30/3£510

Wed 7/506:30BHD - ORD

2 stops21h 44mDelta

Sun 11/519:25ORD - BHD

2 stops15h 30mDelta

Deal found 30/3£525

Sun 27/406:50BHD - ORD

2 stops16h 52mAmerican Airlines

Sun 4/520:20ORD - BHD

1 stop12h 20mAmerican Airlines

Deal found 30/3£533

Sun 27/406:10BFS - ORD

2 stops40h 34mMultiple Airlines

Sun 4/522:15ORD - BFS

2 stops18h 50mMultiple Airlines

Deal found 30/3£540

Mon 2/606:30BHD - ORD

1 stop13h 40mKLM

Fri 6/616:20ORD - BHD

1 stop22h 55mKLM

Deal found 31/3£882

Mon 2/606:30BHD - ORD

1 stop13h 40mVirgin Atlantic

Fri 6/613:45ORD - BHD

2 stops21h 10mVirgin Atlantic

Deal found 31/3£883

Fri 13/606:45BHD - ORD

2 stops18h 15mAer Lingus

Fri 13/621:15ORD - BHD

2 stops17h 35mAer Lingus

Deal found 30/3£1,071

Sun 30/320:05BHD - ORD

2 stops27h 45mFinnair

Thu 10/417:45ORD - BHD

1 stop11h 25mFinnair

Deal found 30/3£1,350

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

Sun 27/406:50BHD - ORD

1 stop16h 10mMultiple Airlines

Sun 4/517:45ORD - BHD

1 stop13h 20mMultiple Airlines

Deal found 30/3£502

Wed 7/506:50BHD - ORD

1 stop13h 00mBritish Airways

Sun 11/517:40ORD - BHD

1 stop11h 50mBritish Airways

Deal found 30/3£510

Wed 7/506:30BHD - ORD

2 stops21h 44mDelta

Sun 11/519:25ORD - BHD

2 stops15h 30mDelta

Deal found 30/3£525

Sun 27/406:50BHD - ORD

2 stops16h 52mAmerican Airlines

Sun 4/520:20ORD - BHD

1 stop12h 20mAmerican Airlines

Deal found 30/3£533

Mon 2/606:30BHD - ORD

1 stop13h 40mKLM

Fri 6/616:20ORD - BHD

1 stop22h 55mKLM

Deal found 31/3£882

Mon 2/606:30BHD - ORD

1 stop13h 40mVirgin Atlantic

Fri 6/613:45ORD - BHD

2 stops21h 10mVirgin Atlantic

Deal found 31/3£883

Fri 13/606:45BHD - ORD

2 stops18h 15mAer Lingus

Fri 13/621:15ORD - BHD

2 stops17h 35mAer Lingus

Deal found 30/3£1,071

Sun 27/406:10BFS - ORD

2 stops40h 34mMultiple Airlines

Sun 4/522:15ORD - BFS

2 stops18h 50mMultiple Airlines

Deal found 30/3£540

Last-minute flights from Northern Ireland to Illinois
Discover last-minute flight deals from Northern Ireland to Illinois. Data last updated 1 April 2025 and is based on user searches.

Wed 16/406:30BHD - ORD

1 stop14h 10mDelta

Sun 20/418:15ORD - BHD

2 stops16h 40mDelta

Deal found 29/3£818

Sun 27/406:50BHD - ORD

1 stop16h 10mMultiple Airlines

Sun 4/517:45ORD - BHD

1 stop13h 20mMultiple Airlines

Deal found 30/3£502

Sun 27/415:50BHD - ORD

2 stops25h 15mBritish Airways

Sun 4/515:10ORD - BHD

2 stops15h 55mBritish Airways

Deal found 30/3£520

Sun 27/406:50BHD - ORD

2 stops16h 52mAmerican Airlines

Sun 4/520:20ORD - BHD

1 stop12h 20mAmerican Airlines

Deal found 30/3£533

Sun 27/406:10BFS - ORD

2 stops40h 34mMultiple Airlines

Sun 4/522:15ORD - BFS

2 stops18h 50mMultiple Airlines

Deal found 30/3£540

One-way flights from Northern Ireland to Illinois
Search for one-way flight options from Northern Ireland to Illinois. Find affordable one-way fares based on user searches. Data last updated 1 April 2025.

Fri 13/610:55BFS - ORD

2 stops25h 40mMultiple Airlines

Deal found 30/3£257

Wed 7/507:05BHD - ORD

3 stops31h 45mMultiple Airlines

Deal found 30/3£287

Fri 16/506:45BHD - ORD

2 stops18h 15mAer Lingus

Deal found 31/3£613

Fri 13/611:55BHD - ORD

1 stop12h 20mBritish Airways

Deal found 30/3£658

Fri 16/506:30BHD - ORD

1 stop13h 40mDelta

Deal found 31/3£1,275

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Sun 27/4

06:50-17:00

1 stop16h 10m

Chicago O'Hare Intl

Sun 4/5

17:45-13:05

1 stop13h 20m

£502

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Wed 7/5

06:50-13:50

1 stop13h 00m

Chicago O'Hare Intl

Sun 11/5

17:40-11:30

1 stop11h 50m

£510

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Wed 7/5

06:30-22:14

2 stops21h 44m

Chicago O'Hare Intl

Sun 11/5

19:25-16:55

2 stops15h 30m

£525

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Sun 27/4

06:50-17:42

2 stops16h 52m

Chicago O'Hare Intl

Sun 4/5

20:20-14:40

1 stop12h 20m

£533

BelfastChicago

BFS - ORD

BFSORD

Belfast Intl

Sun 27/4

06:10-16:44

2 stops40h 34m

Chicago O'Hare Intl

Sun 4/5

22:15-23:05

2 stops18h 50m

£540

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Mon 2/6

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

Fri 6/6

16:20-21:15

1 stop22h 55m

£882

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Mon 2/6

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

Fri 6/6

13:45-16:55

2 stops21h 10m

£883

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Fri 13/6

06:45-19:00

2 stops18h 15m

Chicago O'Hare Intl

Fri 13/6

21:15-20:50

2 stops17h 35m

£1,071

BelfastChicago

BFS - ORD

BFSORD

Belfast Intl

Fri 13/6

10:55-06:35

2 stops25h 40m

£257

BelfastChicago

BHD - ORD

BHDORD

Belfast City

Wed 7/5

07:05-08:50

3 stops31h 45m

£287

Flights are sorted by cheapest return flights first.

Deals found on 30/3

Showing 1-10 of 13 results

Best time to book a flight from Northern Ireland to Illinois

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

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 Northern Ireland to Illinois

Rainfall in Illinois by month

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.

Temperature in Illinois by month

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).

Reviews of airlines servicing Illinois

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Delta

8.0

Very Good

7,899 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

KLM

7.8

Good

1,321 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Virgin Atlantic

7.4

Good

636 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Aer Lingus

7.0

Good

1,061 reviews

Delta

8.0

Very Good

7,899 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

Related info for your journey

What are the cheapest airlines to fly from Northern Ireland to Illinois one-way?
To fly one-way, consider booking your trip with Aer Lingus, which is currently one of the cheapest options available, starting at £613. British Airways flights start at £658 while deals on Delta start at £1,275 one-way.
Can I find deals for flights from Northern Ireland to Illinois that include hotel bookings?
Yes. In addition to deals on Northern Ireland to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Northern Ireland to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Northern Ireland to Illinois.
Can I find deals for business class flights from Northern Ireland to Illinois?
Yes. Cheapflights offers flight deals from Northern Ireland 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.
What is the cheapest month to book a flight from Northern Ireland to Illinois?
Currently, January is the cheapest month in which you can book a flight from Northern Ireland to Illinois (average of £595). Flying from Northern Ireland to Illinois in July is currently the most expensive (average of £843). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Northern Ireland to Illinois

Heathrow to John F Kennedy Intl flights

Heathrow to Newark flights

Gatwick to John F Kennedy Intl flights

Heathrow to LaGuardia flights

London City to John F Kennedy Intl flights

Gatwick to Newark flights

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Manchester to John F Kennedy Intl flights

Luton to John F Kennedy Intl flights

Heathrow to Dallas/Fort Worth flights

Heathrow to Atlanta flights

Stansted to Newark flights

Heathrow to Baltimore flights

Heathrow to Hobby flights

London City to Los Angeles flights

Gatwick to Boston flights

London City to Miami flights

Gatwick to Miami flights

Gatwick to Los Angeles flights

Heathrow to George Bush Intcntl flights

London City to Orlando flights

Gatwick to Stewart flights

Manchester to Newark flights

London City to Boston flights

Heathrow to Nashville flights

Manchester to LaGuardia flights

Luton to Newark flights

Heathrow to Denver flights

Heathrow to Raleigh flights

Heathrow to Tampa flights

Gatwick to San Francisco flights

London City to San Francisco flights

Luton to Stewart flights

Stansted to Boston flights

Heathrow to San Diego flights

Heathrow to Charlotte flights

Complete your trip

Illinois car hire

Chicago O'Hare Intl Airport car hire

Chicago Midway Airport car hire

Moline Quad-City Airport car hire

Greater Peoria Airport car hire

Bloomington-Normal Airport car hire

Springfield Capital Airport car hire

Chicago Greater Rockford Airport car hire

Champaign University-Willard Airport car hire

Belleville Airport car hire

Marion Williamson County Airport car hire

Quincy Regional Airport car hire

Direct flights to United States

Fly with Cheapflights

How does Cheapflights help users find flights from Northern Ireland to Illinois?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Illinois from Northern Ireland today with Cheapflights!

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

Millions of users choose and trust Cheapflights to book the best flight deals from Northern Ireland to Illinois for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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

Certainly. Search results for flights to Illinois from Northern Ireland 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 Northern Ireland to Illinois become cheaper?

Not ready to book yet? You can track prices for flights from Northern Ireland to Illinois on Cheapflights with our Price Alert feature and get notified when better prices are available.

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Cheap flights from Northern Ireland to Illinois from £257

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 13/6. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Northern Ireland to Illinois

Keep the following information in mind while searching for Northern Ireland to Illinois flight deals. Data was last updated 1 April 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Northern Ireland to Illinois

Cheapest flights from Northern Ireland to IllinoisExplore the most affordable flight options available from Northern Ireland to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 1 April 2025.

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

Cheapflights Fare Finder

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

Best time to book a flight from Northern Ireland to Illinois

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

Cheapflights Insights

Everything you need to know about your flight from Northern Ireland to Illinois

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

Related info for your journey

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

What are the cheapest airlines to fly from Northern Ireland to Illinois one-way?

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

How can I find direct flights from Northern Ireland to Illinois?

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

What is the cheapest month to book a flight from Northern Ireland to Illinois?

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 Northern Ireland to Illinois

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

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Northern Ireland to Illinois?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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