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

To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £353. Delta flights start at £385 while deals on American Airlines start at £541 one-way.

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

Currently, January is the cheapest month in which you can book a flight from Illinois to Northern Ireland (average of £67). Flying from Illinois to Northern Ireland in July is currently the most expensive (average of £90). 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 Illinois to Northern Ireland?

December can be a great time to fly to Northern Ireland from Illinois with a flight ticket averaging about £675. Cheapflights users have found deals in the month of December for as cheap as £447. The most expensive prices can be found in the month of May.

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

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

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

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

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

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

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

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

£226+ Flights from Illinois to Northern Ireland

Cheap flight deals from Illinois to Northern Ireland

Round-trip from	£481
One-way from	£226
Popular in	May
Cheapest in	December
Average price	£675

23/9-7/10
2 total stops
25h 05m total
Illinois to Northern Ireland

Search Deals

8/7
2 total stops
38h 12m total
Illinois to Northern Ireland

Search Deals

Highest demand for flights based on searches. 22% potential increase in price (£148 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 6% potential price decrease (£33 potential savings vs. average return price).

Search Deals

Average for round-trip flights in April 2025

Search Deals

Find flight deals from Illinois to Northern Ireland

Cheapest flights from Illinois to Northern Ireland
Explore the most affordable flight options available from Illinois to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 April 2025.

Tue 23/917:45ORD - BHD

1 stop10h 50mMultiple Airlines

Tue 7/1006:35BHD - ORD

1 stop14h 15mMultiple Airlines

Deal found 1/4£481

Tue 23/917:45ORD - BHD

1 stop10h 50mFinnair

Tue 7/1016:25BHD - ORD

2 stops33h 09mFinnair

Deal found 1/4£490

Tue 23/912:46ORD - BHD

2 stops15h 49mBritish Airways

Tue 7/1009:35BHD - ORD

2 stops16h 00mBritish Airways

Deal found 1/4£496

Tue 23/917:45ORD - BHD

1 stop10h 50mAmerican Airlines

Tue 7/1009:35BHD - ORD

2 stops16h 00mAmerican Airlines

Deal found 1/4£516

Tue 13/509:55ORD - BFS

2 stops28h 40mMultiple Airlines

Tue 20/506:15BFS - ORD

3 stops46h 24mMultiple Airlines

Deal found 1/4£537

Fri 16/517:15ORD - BHD

2 stops22h 00mDelta

Fri 23/506:30BHD - ORD

2 stops19h 51mDelta

Deal found 1/4£752

Fri 16/518:38MDW - BHD

2 stops20h 37mDelta

Fri 23/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 1/4£752

Tue 15/716:52STL - BHD

2 stops16h 28mBritish Airways

Mon 21/719:30BHD - STL

2 stops29h 38mBritish Airways

Deal found 2/4£786

Mon 14/720:01STL - BHD

2 stops15h 29mMultiple Airlines

Mon 21/709:50BHD - STL

3 stops19h 59mMultiple Airlines

Deal found 2/4£1,630

Fri 11/421:15ORD - BHD

1 stop12h 15mIberia

Fri 18/406:35BHD - ORD

1 stop17h 40mIberia

Deal found 2/4£2,635

Best flights from Illinois to Northern Ireland
Discover carefully curated flight deals from Illinois to Northern Ireland that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 2 April 2025.

Tue 23/917:45ORD - BHD

1 stop10h 50mMultiple Airlines

Tue 7/1006:35BHD - ORD

1 stop14h 15mMultiple Airlines

Deal found 1/4£481

Tue 23/917:45ORD - BHD

1 stop10h 50mFinnair

Tue 7/1016:25BHD - ORD

2 stops33h 09mFinnair

Deal found 1/4£490

Tue 23/912:46ORD - BHD

2 stops15h 49mBritish Airways

Tue 7/1009:35BHD - ORD

2 stops16h 00mBritish Airways

Deal found 1/4£496

Tue 23/917:45ORD - BHD

1 stop10h 50mAmerican Airlines

Tue 7/1009:35BHD - ORD

2 stops16h 00mAmerican Airlines

Deal found 1/4£516

Fri 16/517:15ORD - BHD

2 stops22h 00mDelta

Fri 23/506:30BHD - ORD

2 stops19h 51mDelta

Deal found 1/4£752

Tue 13/509:55ORD - BFS

2 stops28h 40mMultiple Airlines

Tue 20/506:15BFS - ORD

3 stops46h 24mMultiple Airlines

Deal found 1/4£537

Fri 16/518:38MDW - BHD

2 stops20h 37mDelta

Fri 23/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 1/4£752

Tue 15/716:52STL - BHD

2 stops16h 28mBritish Airways

Mon 21/719:30BHD - STL

2 stops29h 38mBritish Airways

Deal found 2/4£786

Mon 14/720:01STL - BHD

2 stops15h 29mMultiple Airlines

Mon 21/709:50BHD - STL

3 stops19h 59mMultiple Airlines

Deal found 2/4£1,630

Last-minute flights from Illinois to Northern Ireland
Discover last-minute flight deals from Illinois to Northern Ireland. Data last updated 2 April 2025 and is based on user searches.

Fri 11/422:10ORD - BHD

2 stops39h 05mBritish Airways

Fri 18/419:30BHD - ORD

1 stop27h 30mBritish Airways

Deal found 1/4£1,556

Fri 11/421:15ORD - BHD

1 stop12h 15mIberia

Fri 18/406:35BHD - ORD

1 stop17h 40mIberia

Deal found 2/4£2,635

Fri 11/414:57MDW - BHD

2 stops19h 58mDelta

Fri 18/406:30BHD - MDW

2 stops17h 50mDelta

Deal found 1/4£3,686

Wed 30/420:20ORD - BHD

1 stop11h 10mBritish Airways

Sat 10/509:35BHD - ORD

1 stop14h 40mBritish Airways

Deal found 2/4£528

Wed 30/422:20ORD - BHD

1 stop11h 15mAmerican Airlines

Sat 10/507:05BHD - ORD

2 stops16h 37mAmerican Airlines

Deal found 2/4£556

Thu 1/519:25ORD - BHD

2 stops15h 55mMultiple Airlines

Thu 8/507:05BHD - ORD

3 stops37h 01mMultiple Airlines

Deal found 1/4£693

Tue 13/509:55ORD - BFS

2 stops28h 40mMultiple Airlines

Tue 20/506:15BFS - ORD

3 stops46h 24mMultiple Airlines

Deal found 1/4£537

Fri 16/517:15ORD - BHD

2 stops22h 00mDelta

Fri 23/506:30BHD - ORD

2 stops19h 51mDelta

Deal found 1/4£752

Fri 16/518:38MDW - BHD

2 stops20h 37mDelta

Fri 23/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 1/4£752

One-way flights from Illinois to Northern Ireland
Search for one-way flight options from Illinois to Northern Ireland. Find affordable one-way fares based on user searches. Data last updated 2 April 2025.

Tue 8/713:43ORD - BFS

2 stops38h 12mMultiple Airlines

Deal found 2/4£226

Tue 8/713:43ORD - BHD

2 stops43h 22mMultiple Airlines

Deal found 2/4£242

Thu 5/620:41MDW - BFS

3 stops52h 34mMultiple Airlines

Deal found 1/4£286

Thu 5/620:41MDW - BHD

3 stops41h 29mMultiple Airlines

Deal found 1/4£303

Wed 20/821:15ORD - BHD

1 stop12h 20mBritish Airways

Deal found 2/4£353

Tue 8/714:00MDW - BHD

2 stops20h 55mDelta

Deal found 2/4£385

Thu 5/622:30ORD - BHD

1 stop14h 15mAmerican Airlines

Deal found 1/4£541

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 23/9

17:45-10:35

1 stop10h 50m

Belfast City

Tue 7/10

06:35-14:50

1 stop14h 15m

£481

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 23/9

17:45-10:35

1 stop10h 50m

Belfast City

Tue 7/10

16:25-19:34

2 stops33h 09m

£490

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 23/9

12:46-10:35

2 stops15h 49m

Belfast City

Tue 7/10

09:35-19:35

2 stops16h 00m

£496

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 23/9

17:45-10:35

1 stop10h 50m

Belfast City

Tue 7/10

09:35-19:35

2 stops16h 00m

£516

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 13/5

09:55-20:35

2 stops28h 40m

Belfast Intl

Tue 20/5

06:15-22:39

3 stops46h 24m

£537

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 16/5

17:15-21:15

2 stops22h 00m

Belfast City

Fri 23/5

06:30-20:21

2 stops19h 51m

£752

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Fri 16/5

18:38-21:15

2 stops20h 37m

Belfast City

Fri 23/5

06:30-18:45

2 stops18h 15m

£752

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Tue 15/7

16:52-15:20

2 stops16h 28m

Belfast City

Mon 21/7

19:30-19:08

2 stops29h 38m

£786

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 14/7

20:01-17:30

2 stops15h 29m

Belfast City

Mon 21/7

09:50-23:49

3 stops19h 59m

£1,630

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Tue 8/7

13:43-09:55

2 stops38h 12m

£226

Flights are sorted by cheapest return flights first.

Deals found on 2/4

Showing 1-10 of 16 results

Best time to book a flight from Illinois to Northern Ireland

Have a flexible travel schedule? Discover the best time to fly to Northern Ireland from Illinois 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 Illinois to Northern Ireland

Rainfall in Northern Ireland by month

In terms of precipitation, rainfall in Northern Ireland ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Northern Ireland when rainfall is around 50.0 mm.

Temperature in Northern Ireland by month

If weather is an important factor for your trip to Northern Ireland, 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 16.0 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 Northern Ireland

To help decide which airline to fly from Illinois to Northern Ireland, see what other customers have to say about Delta, Finnair and American Airlines. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,897 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very Good

7,897 reviews

Delta

8.0

Very Good

7,897 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Finnair

7.6

Good

1,267 reviews

Delta

8.0

Very Good

7,897 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,897 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

British Airways

6.6

Okay

6,715 reviews

Delta

8.0

Very Good

7,897 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What are the cheapest airlines to fly from Illinois to Northern Ireland one-way?
To fly one-way, consider booking your trip with British Airways, which is currently one of the cheapest options available, starting at £353. Delta flights start at £385 while deals on American Airlines start at £541 one-way.
Can I find deals for flights from Illinois to Northern Ireland that include hotel bookings?
Yes. In addition to deals on Illinois to Northern Ireland flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to Northern Ireland?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Northern Ireland.
Can I find deals for business class flights from Illinois to Northern Ireland?
Yes. Cheapflights offers flight deals from Illinois to Northern Ireland 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 Illinois to Northern Ireland?
Currently, January is the cheapest month in which you can book a flight from Illinois to Northern Ireland (average of £67). Flying from Illinois to Northern Ireland in July is currently the most expensive (average of £90). 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 Illinois to Northern Ireland

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Miami to Heathrow flights

Boston to London City flights

Los Angeles to London City flights

Dulles Intl to London City flights

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Denver to Heathrow flights

Newark to Edinburgh flights

Boston to Stansted flights

O'Hare Intl to Gatwick flights

Reagan-National to Gatwick flights

Philadelphia to Heathrow flights

San Francisco to Gatwick flights

San Francisco to London City flights

George Bush Intcntl to Heathrow flights

Charlotte to Heathrow flights

Tampa to Heathrow flights

O'Hare Intl to London City flights

Sky Harbor Intl to Heathrow flights

Minneapolis to Heathrow flights

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Direct flights to United Kingdom

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

Cheapflights helps you search for flights from Illinois to Northern Ireland via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Northern Ireland from Illinois.

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

Yes, we can. To see specific flights from Illinois to Northern Ireland with no change fees, users can toggle flexible booking options after using the search form above to find flights.

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

Of course! You can now track prices for flights from Illinois to Northern Ireland and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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Cheap flights from Illinois to Northern Ireland from £226

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 8/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Northern Ireland

Keep the following information in mind while searching for Illinois to Northern Ireland flight deals. Data was last updated 2 April 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Illinois to Northern Ireland

Cheapest flights from Illinois to Northern IrelandExplore the most affordable flight options available from Illinois to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 April 2025.

Explore the most affordable flight options available from Illinois to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 April 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Illinois to Northern Ireland

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

Cheapflights Insights

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

Rainfall in Northern Ireland by month

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

Temperature in Northern Ireland by month

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

Reviews of airlines servicing Northern Ireland

To help decide which airline to fly from Illinois to Northern Ireland, see what other customers have to say about Delta, Finnair and American Airlines. You can also see how each airline stacks up in terms of 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 Northern Ireland. 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 Illinois to Northern Ireland one-way?

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

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

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

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

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 Northern Ireland

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 Illinois to Northern Ireland?

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

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

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

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Illinois to Northern Ireland
Explore the most affordable flight options available from Illinois to Northern Ireland. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 2 April 2025.