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

£289 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Delta and Iberia, with prices starting from £396 and £419, respectively.

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

Currently, January is the cheapest month in which you can book a flight from Illinois to Belfast (average of £67). Flying from Illinois to Belfast 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 are the most popular routes from Illinois to Belfast?

The most popular route from Illinois to Belfast is Chicago O'Hare Intl - Belfast Intl. You may also consider Chicago O'Hare Intl - Belfast City or Chicago Midway - Belfast Intl.

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

Flights from Illinois to Belfast lean towards being more expensive in May. Prices are generally better when you fly from Illinois to Belfast in December, with the cheapest ticket starting at £447.

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

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

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

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

How can I find direct flights from Illinois to Belfast?

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

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

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

£261+ Flights from Illinois to Belfast

Cheap flight deals from Illinois to Belfast

Round-trip from	£481
One-way from	£261
Popular in	May
Cheapest in	December
Average price	£675

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

Search Deals

23/7
2 total stops
25h 32m total
Illinois to Belfast

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 Belfast

Cheapest flights from Illinois to Belfast
Explore the most affordable flight options available from Illinois to Belfast. 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 31/3£613

Thu 15/519:25ORD - BHD

2 stops15h 30mKLM

Thu 22/506:30BHD - ORD

2 stops16h 17mKLM

Deal found 31/3£653

Wed 18/618:25MDW - BHD

2 stops20h 50mMultiple Airlines

Fri 19/906:30BHD - MDW

2 stops18h 06mMultiple Airlines

Deal found 31/3£720

Thu 15/512:48MDW - BHD

2 stops22h 07mDelta

Thu 22/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 31/3£732

Mon 14/707:23STL - BHD

2 stops23h 32mBritish Airways

Mon 21/719:30BHD - STL

2 stops29h 38mBritish Airways

Deal found 1/4£805

Tue 15/715:45ORD - BHD

2 stops15h 05mAer Lingus

Sun 20/707:00BHD - ORD

2 stops18h 00mAer Lingus

Deal found 31/3£875

Sun 27/411:15MDW - BFS

3 stops29h 10mMultiple Airlines

Sun 4/506:10BFS - MDW

3 stops32h 09mMultiple Airlines

Deal found 30/3£1,531

Tue 15/712:27STL - BHD

2 stops16h 08mMultiple Airlines

Mon 21/709:50BHD - STL

3 stops19h 59mMultiple Airlines

Deal found 1/4£1,630

Best flights from Illinois to Belfast
Discover carefully curated flight deals from Illinois to Belfast 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

Thu 15/519:25ORD - BHD

2 stops15h 30mKLM

Thu 22/506:30BHD - ORD

2 stops16h 17mKLM

Deal found 31/3£653

Thu 15/512:48MDW - BHD

2 stops22h 07mDelta

Thu 22/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 31/3£732

Tue 15/715:45ORD - BHD

2 stops15h 05mAer Lingus

Sun 20/707:00BHD - ORD

2 stops18h 00mAer Lingus

Deal found 31/3£875

Tue 13/509:55ORD - BFS

2 stops28h 40mMultiple Airlines

Tue 20/506:15BFS - ORD

3 stops46h 24mMultiple Airlines

Deal found 31/3£613

Wed 18/618:25MDW - BHD

2 stops20h 50mMultiple Airlines

Fri 19/906:30BHD - MDW

2 stops18h 06mMultiple Airlines

Deal found 31/3£720

Mon 14/707:23STL - BHD

2 stops23h 32mBritish Airways

Mon 21/719:30BHD - STL

2 stops29h 38mBritish Airways

Deal found 1/4£805

Sun 27/411:15MDW - BFS

3 stops29h 10mMultiple Airlines

Sun 4/506:10BFS - MDW

3 stops32h 09mMultiple Airlines

Deal found 30/3£1,531

Fri 4/719:25MDW - BHD

2 stops15h 30mKLM

Sat 12/706:30BHD - MDW

2 stops17h 58mKLM

Deal found 31/3£1,998

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

Fri 11/422:10ORD - BHD

2 stops39h 05mBritish Airways

Fri 18/416:20BHD - ORD

1 stop30h 40mBritish Airways

Deal found 31/3£1,467

Fri 11/416:20ORD - BHD

1 stop22h 55mKLM

Fri 18/417:25BHD - ORD

1 stop26h 45mKLM

Deal found 31/3£2,226

Fri 11/413:15MDW - BHD

2 stops21h 40mDelta

Fri 18/406:30BHD - MDW

2 stops17h 50mDelta

Deal found 31/3£3,416

Sun 27/419:25ORD - BHD

2 stops19h 25mMultiple Airlines

Sun 4/507:05BHD - ORD

3 stops30h 35mMultiple Airlines

Deal found 30/3£674

Sun 27/417:35MDW - BHD

2 stops33h 15mMultiple Airlines

Sun 4/518:05BHD - MDW

3 stops29h 14mMultiple Airlines

Deal found 30/3£1,197

Sun 27/411:15MDW - BFS

3 stops29h 10mMultiple Airlines

Sun 4/506:10BFS - MDW

3 stops32h 09mMultiple Airlines

Deal found 30/3£1,531

Wed 30/420:20ORD - BHD

1 stop13h 15mBritish Airways

Sat 10/509:35BHD - ORD

1 stop14h 40mBritish Airways

Deal found 1/4£528

Wed 30/420:20ORD - BHD

1 stop11h 10mAmerican Airlines

Sat 10/507:05BHD - ORD

2 stops16h 24mAmerican Airlines

Deal found 31/3£557

Tue 13/509:55ORD - BFS

2 stops28h 40mMultiple Airlines

Tue 20/506:15BFS - ORD

3 stops46h 24mMultiple Airlines

Deal found 31/3£613

Thu 15/519:25ORD - BHD

2 stops15h 30mKLM

Thu 22/506:30BHD - ORD

2 stops16h 17mKLM

Deal found 31/3£653

Thu 15/512:48MDW - BHD

2 stops22h 07mDelta

Thu 22/506:30BHD - MDW

2 stops18h 15mDelta

Deal found 31/3£732

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

Wed 23/713:03ORD - BFS

2 stops25h 32mMultiple Airlines

Deal found 31/3£261

Sun 11/505:51ORD - BHD

2 stops32h 54mMultiple Airlines

Deal found 30/3£280

Sun 11/519:15ORD - BHD

1 stop11h 50mBritish Airways

Deal found 30/3£289

Sun 11/510:55MDW - BHD

2 stops43h 10mMultiple Airlines

Deal found 30/3£325

Wed 20/815:40MDW - BHD

2 stops19h 15mDelta

Deal found 31/3£396

Thu 15/522:25ORD - BHD

1 stop14h 20mIberia

Deal found 31/3£419

Cheapflights Fare Finder

Use the filters below to find and compare flights from Illinois to Belfast 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

£613

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Thu 15/5

19:25-16:55

2 stops15h 30m

Belfast City

Thu 22/5

06:30-16:47

2 stops16h 17m

£653

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Wed 18/6

18:25-21:15

2 stops20h 50m

Belfast City

Fri 19/9

06:30-18:36

2 stops18h 06m

£720

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Thu 15/5

12:48-16:55

2 stops22h 07m

Belfast City

Thu 22/5

06:30-18:45

2 stops18h 15m

£732

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 14/7

07:23-12:55

2 stops23h 32m

Belfast City

Mon 21/7

19:30-19:08

2 stops29h 38m

£805

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Tue 15/7

15:45-12:50

2 stops15h 05m

Belfast City

Sun 20/7

07:00-19:00

2 stops18h 00m

£875

Flights are sorted by cheapest return flights first.

Deals found on 31/3

Showing 1-10 of 19 results

Best time to book a flight from Illinois to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast 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 Belfast

Rainfall in Belfast by month

In terms of precipitation, rainfall in Belfast 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 Belfast when rainfall is around 50.0 mm.

Temperature in Belfast by month

If weather is an important factor for your trip to Belfast, 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 Belfast

To help decide which airline to fly from Illinois to Belfast, see what other customers have to say about Delta, KLM and Finnair. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very Good

7,898 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

7,898 reviews

Delta

8.0

Very Good

7,898 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.

KLM

7.8

Good

1,323 reviews

Delta

8.0

Very Good

7,898 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

7,898 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

7,898 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.

Aer Lingus

7.0

Good

1,060 reviews

Delta

8.0

Very Good

7,898 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 Belfast one-way?
£289 is the cheapest one-way deal found within the past few days, from British Airways. You may also be able to find cheap deals on Delta and Iberia, with prices starting from £396 and £419, respectively.
What are the most popular routes from Illinois to Belfast?
The most popular route from Illinois to Belfast is Chicago O'Hare Intl - Belfast Intl. You may also consider Chicago O'Hare Intl - Belfast City or Chicago Midway - Belfast Intl.
Can I find deals for flights from Illinois to Belfast that include hotel bookings?
Yes. In addition to deals on Illinois to Belfast flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to Belfast?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Belfast.
Can I find deals for business class flights from Illinois to Belfast?
Yes. Cheapflights offers flight deals from Illinois to Belfast 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 Belfast?
Currently, January is the cheapest month in which you can book a flight from Illinois to Belfast (average of £67). Flying from Illinois to Belfast 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 Belfast

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Fly with Cheapflights

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

Deals for Illinois to Belfast 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 Illinois to Belfast?

Cheapflights helps you find that perfect flight to Belfast from Illinois by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Need flexible booking options for your flight to Belfast from Illinois? Don’t worry, Cheapflights have you covered. Use our search filter to only show flights with no change fees.

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

Yes! Start tracking prices for Illinois to Belfast flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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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.

Cheap flights from Illinois to Belfast from £261

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 23/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Belfast

Keep the following information in mind while searching for Illinois to Belfast 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 Belfast

Cheapest flights from Illinois to BelfastExplore the most affordable flight options available from Illinois to Belfast. 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 Belfast. 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 Belfast that are best for you.

Best time to book a flight from Illinois to Belfast

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

Cheapflights Insights

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

Rainfall in Belfast by month

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

Temperature in Belfast by month

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

Reviews of airlines servicing Belfast

To help decide which airline to fly from Illinois to Belfast, see what other customers have to say about Delta, KLM and Finnair. Users have also rated airlines 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 Belfast. 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 Belfast one-way?

What are the most popular routes from Illinois to Belfast?

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

How can I find direct flights from Illinois to Belfast?

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

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

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 Belfast

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 Belfast?

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

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

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

100% Free

Book with Flexibility

Travel Smart

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