Find flights
When to book
FAQs

Cheap flights from Illinois to Northern Ireland from £312

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 17/4. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BFS
3 Dec — 10 Dec1
1 adult
1 adult, Economy, 0 bags

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 3 November 2025.

Round-trip from

£475

One-way from

£312
American Airlines
  • American Airlines
  • 1/12-7/12
  • 4 total stops
  • 32h 27m total
  • Illinois to Northern Ireland
Search Deals
17/4
  • 17/4
  • 2 total stops
  • 40h 00m total
  • Illinois to Northern Ireland
Search Deals

Find flight deals from Illinois to Northern Ireland

Enter your travel dates to find the best prices.

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 3 November 2025.

Mon 1/1215:43STL - BHD
2 stops16h 32mAmerican Airlines
Sun 7/1209:10BHD - STL
2 stops15h 55mAmerican Airlines
Deal found 1/11£475
Sat 15/1118:30ORD - BFS
2 stops22h 10mMultiple Airlines
Tue 18/1106:30BFS - ORD
3 stops38h 30mMultiple Airlines
Deal found 1/11£538
Wed 3/1216:25ORD - BHD
1 stop22h 35mVirgin Atlantic
Sun 7/1206:30BHD - ORD
1 stop13h 50mVirgin Atlantic
Deal found 2/11£541
Wed 3/1216:25ORD - BHD
1 stop22h 35mKLM
Sun 7/1206:30BHD - ORD
1 stop13h 50mKLM
Deal found 1/11£581
Tue 16/1207:05ORD - BFS
2 stops25h 20mMultiple Airlines
Tue 23/1217:30BFS - ORD
2 stops32h 35mMultiple Airlines
Deal found 31/10£587
Wed 3/1213:17ORD - BHD
2 stops13h 53mAmerican Airlines
Sun 7/1206:30BHD - ORD
1 stop13h 20mAmerican Airlines
Deal found 1/11£735
Tue 30/1220:40ORD - BHD
1 stop14h 05mAmerican Airlines
Mon 5/106:35BHD - ORD
2 stops17h 21mAmerican Airlines
Deal found 1/11£802
Tue 30/1217:10ORD - BHD
1 stop11h 20mBritish Airways
Mon 5/119:25BHD - ORD
1 stop27h 35mBritish Airways
Deal found 2/11£809
Tue 4/1121:50ORD - BFS
2 stops18h 45mMultiple Airlines
Thu 6/1106:30BFS - ORD
2 stops22h 36mMultiple Airlines
Deal found 31/10£809
Wed 17/1218:30ORD - BFS
2 stops15h 40mMultiple Airlines
Wed 24/1216:25BFS - ORD
3 stops33h 35mMultiple Airlines
Deal found 1/11£834
Tue 4/1119:40ORD - BHD
2 stops16h 45mAer Lingus
Thu 6/1107:00BHD - ORD
2 stops16h 55mAer Lingus
Deal found 31/10£870
Tue 4/1117:09MDW - BHD
2 stops17h 41mKLM
Thu 6/1106:30BHD - MDW
2 stops15h 44mKLM
Deal found 31/10£1,590

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to Northern Ireland 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, Cheapflights users made 858,174 searches. Data last updated 3 November 2025.
Use the filters below to find and compare flights from Illinois to Northern Ireland that are best for you.

Fly from

Illinois

Fly to

Northern Ireland

Route

Depart

Return

Price

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 1/12

15:43-14:15

2 stops16h 32m

Belfast City

Sun 7/12

09:10-19:05

2 stops15h 55m

£475

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 12/1

15:37-14:15

2 stops16h 38m

Belfast City

Tue 20/1

06:35-21:15

2 stops20h 40m

£483

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 18/3

22:45-14:15

1 stop10h 30m

Belfast City

Sun 22/3

12:10-14:50

1 stop31h 40m

£533

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Sat 15/11

18:30-22:40

2 stops22h 10m

Belfast Intl

Tue 18/11

06:30-15:00

3 stops38h 30m

£538

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 18/3

22:45-14:15

1 stop10h 30m

Belfast City

Sun 22/3

06:30-22:48

2 stops21h 18m

£541

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Wed 3/12

16:25-21:00

1 stop22h 35m

Belfast City

Sun 7/12

06:30-14:20

1 stop13h 50m

£541

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 3/4

19:05-15:30

1 stop14h 25m

Belfast City

Tue 7/4

06:35-13:50

1 stop13h 15m

£545

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Sun 1/3

06:10-16:50

2 stops28h 40m

Belfast City

Thu 5/3

17:20-17:43

2 stops30h 23m

£567

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Fri 1/5

22:00-15:30

1 stop11h 30m

Belfast City

Tue 12/5

13:40-19:30

1 stop11h 50m

£569

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Wed 1/4

09:20-16:55

2 stops25h 35m

Belfast City

Sun 5/4

17:25-09:56

2 stops46h 31m

£576

Flights are sorted by cheapest return flights first.

Deals found on 1/11

Showing 1-10 of 26 results
1
2
3

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

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.

  • How long is the flight from Illinois to Northern Ireland?

    Airlines like American Airlines, British Airways, and Virgin Atlantic fly from Illinois to Northern Ireland in about 10h 30m. The time it takes to get you to your destination can typically vary by up to 18h 10m. Airlines will cover a distance of 3644 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 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.

See more FAQs

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.
John F Kennedy Intl to Heathrow flights
Newark to Heathrow flights
John F Kennedy Intl to Gatwick flights
Boston to Heathrow flights
John F Kennedy Intl to London City flights
Los Angeles to Heathrow flights
Newark to Gatwick flights
LaGuardia to Heathrow flights
Dulles Intl to Heathrow flights
LaGuardia to Gatwick flights
San Francisco to Heathrow flights
John F Kennedy Intl to Stansted flights
O'Hare Intl to Heathrow flights
Dallas/Fort Worth to Heathrow flights
Newark to London City flights
Baltimore to Heathrow flights
Seattle to Heathrow flights
Newark to Stansted flights
Boston to Gatwick flights
Newark to Luton flights
Boston to London City flights
Miami to Heathrow flights
Atlanta to Heathrow flights
Orlando to Heathrow flights
Los Angeles to Gatwick flights
Dulles Intl to Gatwick flights
Reagan-National to Heathrow flights
Dulles Intl to London City flights
Newark to Edinburgh flights
Los Angeles to London City flights
Boston to Stansted flights
Philadelphia to Heathrow flights
San Francisco to Gatwick flights
Hobby to Heathrow flights
O'Hare Intl to Gatwick flights
Boston to Luton flights
Baltimore to Gatwick flights
George Bush Intcntl to Heathrow flights
Denver to Heathrow flights
Reagan-National to Gatwick flights
O'Hare Intl to London City flights
John F Kennedy Intl to Edinburgh flights
Dallas/Fort Worth to Gatwick flights
Tampa to Heathrow flights
San Francisco to London City flights
Charlotte to Heathrow flights
Minneapolis to Heathrow flights

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?

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.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.