How long is the flight from Illinois to Belfast?

For as low as £463, British Airways can have you in Belfast from Illinois in 13h 30m. 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.

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.

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.

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).

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 City.

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.

£236+ Flights from Illinois to Belfast

Q: How much does it cost for a return flight from Illinois to Belfast?

Airfare is below average for this route at the moment. Illinois to Belfast flights typically cost between £488 and £496 in December. The cheapest return flight price found within the last 3 days was £463 on British Airways (5 Dec-9 Dec).

Cheap flight deals from Illinois to Belfast

Round-trip from	£427
One-way from	£236

29/9-7/10
4 total stops
49h 03m total
Illinois to Belfast

Search Deals

28/9
3 total stops
43h 10m total
Illinois to Belfast

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 17 September 2025.

Mon 29/913:26STL - BFS

2 stops27h 44mMultiple Airlines

Tue 7/1006:45BFS - STL

2 stops21h 19mMultiple Airlines

Deal found 15/9£427

Fri 5/1221:45ORD - BHD

1 stop13h 30mBritish Airways

Tue 9/1210:00BHD - ORD

1 stop14h 45mBritish Airways

Deal found 14/9£463

Thu 30/1018:10ORD - BHD

1 stop19h 40mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop29h 00mBritish Airways

Deal found 14/9£470

Fri 3/1016:15ORD - BHD

1 stop18h 40mVirgin Atlantic

Tue 7/1006:30BHD - ORD

1 stop13h 40mVirgin Atlantic

Deal found 16/9£500

Fri 5/1215:45ORD - BHD

2 stops19h 05mDelta

Tue 9/1217:20BHD - ORD

1 stop27h 00mDelta

Deal found 16/9£504

Fri 31/1018:10ORD - BHD

1 stop11h 20mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop33h 55mBritish Airways

Deal found 15/9£511

Fri 17/1018:23MDW - BHD

2 stops20h 52mDelta

Tue 21/1006:30BHD - MDW

2 stops17h 55mDelta

Deal found 16/9£511

Mon 29/919:59STL - BHD

2 stops15h 31mAmerican Airlines

Tue 7/1009:35BHD - STL

2 stops17h 54mAmerican Airlines

Deal found 15/9£518

Fri 3/1016:15ORD - BHD

1 stop23h 00mDelta

Tue 7/1006:30BHD - ORD

1 stop13h 40mDelta

Deal found 14/9£529

Fri 31/1021:15ORD - BFS

3 stops20h 30mMultiple Airlines

Mon 10/1122:20BFS - ORD

3 stops46h 40mMultiple Airlines

Deal found 14/9£532

Fri 26/916:15ORD - BHD

1 stop18h 40mMultiple Airlines

Wed 1/1006:30BHD - ORD

2 stops15h 50mMultiple Airlines

Deal found 15/9£537

Fri 31/1021:15ORD - BFS

3 stops20h 30mMultiple Airlines

Fri 7/1121:30BFS - ORD

3 stops47h 15mMultiple Airlines

Deal found 16/9£537

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 17 September 2025.

Mon 29/913:26STL - BFS

2 stops27h 44mMultiple Airlines

Tue 7/1006:45BFS - STL

2 stops21h 19mMultiple Airlines

Deal found 15/9£427

Fri 5/1221:45ORD - BHD

1 stop13h 30mBritish Airways

Tue 9/1210:00BHD - ORD

1 stop14h 45mBritish Airways

Deal found 14/9£463

Fri 3/1016:15ORD - BHD

1 stop18h 40mVirgin Atlantic

Tue 7/1006:30BHD - ORD

1 stop13h 40mVirgin Atlantic

Deal found 16/9£500

Fri 5/1216:25ORD - BHD

1 stop18h 25mDelta

Tue 9/1217:20BHD - ORD

1 stop27h 00mDelta

Deal found 16/9£500

Mon 29/919:59STL - BHD

2 stops15h 31mAmerican Airlines

Tue 7/1009:35BHD - STL

2 stops17h 54mAmerican Airlines

Deal found 15/9£518

Thu 30/1018:10ORD - BHD

1 stop19h 40mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop29h 00mBritish Airways

Deal found 14/9£470

Mon 29/918:15MDW - BHD

2 stops16h 40mKLM

Thu 2/1006:30BHD - MDW

2 stops17h 05mKLM

Deal found 15/9£983

Fri 3/1016:15ORD - BHD

1 stop23h 00mDelta

Tue 7/1006:30BHD - ORD

1 stop13h 40mDelta

Deal found 14/9£529

Fri 31/1021:15ORD - BFS

3 stops20h 30mMultiple Airlines

Fri 7/1121:30BFS - ORD

3 stops47h 15mMultiple Airlines

Deal found 16/9£537

Sat 4/1017:40ORD - BHD

1 stop10h 30mAmerican Airlines

Sat 11/1007:05BHD - ORD

2 stops16h 31mAmerican Airlines

Deal found 17/9£543

Fri 31/1018:10ORD - BHD

1 stop11h 20mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop33h 55mBritish Airways

Deal found 15/9£511

Fri 17/1009:35MDW - BHD

2 stops29h 40mVirgin Atlantic

Tue 21/1017:25BHD - MDW

2 stops31h 00mVirgin Atlantic

Deal found 13/9£581

Fri 3/1009:20MDW - BHD

2 stops29h 55mDelta

Tue 7/1006:30BHD - MDW

2 stops17h 55mDelta

Deal found 15/9£540

Sat 27/908:40ORD - BFS

3 stops26h 30mMultiple Airlines

Thu 2/1016:25BFS - ORD

3 stops30h 05mMultiple Airlines

Deal found 15/9£575

Sun 1/316:00STL - BHD

2 stops23h 00mVirgin Atlantic

Thu 5/306:30BHD - STL

2 stops20h 09mVirgin Atlantic

Deal found 15/9£587

Fri 17/1013:08MDW - BHD

2 stops26h 07mDelta

Tue 21/1006:30BHD - MDW

2 stops17h 55mDelta

Deal found 15/9£540

Fri 26/919:25ORD - BFS

2 stops20h 55mMultiple Airlines

Wed 1/1021:05BFS - ORD

2 stops27h 10mMultiple Airlines

Deal found 15/9£588

Sun 1/310:45STL - BHD

2 stops28h 15mDelta

Thu 5/306:30BHD - STL

2 stops16h 20mDelta

Deal found 14/9£587

Sun 28/906:30ORD - BFS

2 stops31h 50mMultiple Airlines

Thu 2/1016:25BFS - ORD

3 stops30h 05mMultiple Airlines

Deal found 15/9£606

Thu 30/1013:08MDW - BHD

2 stops22h 42mDelta

Mon 10/1106:30BHD - MDW

2 stops17h 38mDelta

Deal found 14/9£606

Fri 3/1013:08MDW - BHD

2 stops21h 47mVirgin Atlantic

Tue 7/1017:25BHD - MDW

2 stops31h 00mVirgin Atlantic

Deal found 14/9£742

Thu 30/1019:30ORD - BFS

2 stops12h 05mMultiple Airlines

Mon 10/1122:20BFS - ORD

3 stops46h 40mMultiple Airlines

Deal found 14/9£619

Sun 28/919:15ORD - BFS

3 stops22h 05mMultiple Airlines

Wed 1/1017:20BFS - ORD

2 stops25h 15mMultiple Airlines

Deal found 15/9£620

Thu 30/1019:30ORD - BFS

2 stops12h 05mMultiple Airlines

Thu 6/1106:15BFS - ORD

3 stops39h 00mMultiple Airlines

Deal found 14/9£629

Mon 29/912:00ORD - BFS

3 stops19h 15mMultiple Airlines

Thu 2/1016:25BFS - ORD

3 stops30h 05mMultiple Airlines

Deal found 15/9£656

Sun 28/919:15MDW - BHD

2 stops15h 40mKLM

Wed 1/1006:30BHD - MDW

2 stops17h 05mKLM

Deal found 15/9£1,328

Sun 28/918:15MDW - BHD

2 stops16h 40mKLM

Thu 2/1006:30BHD - MDW

2 stops17h 05mKLM

Deal found 15/9£1,328

Fri 26/919:15MDW - BHD

2 stops15h 40mKLM

Wed 1/1006:30BHD - MDW

2 stops17h 05mKLM

Deal found 15/9£1,336

Sat 27/919:15MDW - BHD

2 stops15h 40mKLM

Thu 2/1006:30BHD - MDW

2 stops17h 05mKLM

Deal found 15/9£1,394

Mon 29/913:30STL - BHD

3 stops20h 55mMultiple Airlines

Tue 7/1017:55BHD - STL

3 stops31h 43mMultiple Airlines

Deal found 15/9£1,490

Last-minute flights from Illinois to Belfast
Discover last-minute flight deals from Illinois to Belfast. Data last updated 17 September 2025 and is based on user searches.

Fri 26/916:15ORD - BHD

1 stop18h 40mMultiple Airlines

Wed 1/1006:30BHD - ORD

2 stops15h 50mMultiple Airlines

Deal found 15/9£537

Mon 29/913:26STL - BFS

2 stops27h 44mMultiple Airlines

Tue 7/1006:45BFS - STL

2 stops21h 19mMultiple Airlines

Deal found 15/9£427

Mon 29/919:59STL - BHD

2 stops15h 31mAmerican Airlines

Tue 7/1009:35BHD - STL

2 stops17h 54mAmerican Airlines

Deal found 15/9£518

Mon 29/906:30ORD - BFS

2 stops31h 55mMultiple Airlines

Thu 2/1016:25BFS - ORD

3 stops30h 05mMultiple Airlines

Deal found 15/9£557

Fri 3/1016:15ORD - BHD

1 stop18h 40mVirgin Atlantic

Tue 7/1006:30BHD - ORD

1 stop13h 40mVirgin Atlantic

Deal found 16/9£500

Fri 3/1016:15ORD - BHD

1 stop23h 00mDelta

Tue 7/1006:30BHD - ORD

1 stop13h 40mDelta

Deal found 14/9£529

Sat 4/1017:40ORD - BHD

1 stop10h 30mAmerican Airlines

Sat 11/1007:05BHD - ORD

2 stops16h 31mAmerican Airlines

Deal found 17/9£543

Thu 30/1018:10ORD - BHD

1 stop19h 40mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop29h 00mBritish Airways

Deal found 14/9£470

Fri 31/1018:10ORD - BHD

1 stop11h 20mBritish Airways

Mon 10/1114:50BHD - ORD

1 stop33h 55mBritish Airways

Deal found 15/9£511

Fri 31/1021:15ORD - BFS

3 stops20h 30mMultiple Airlines

Mon 10/1122:20BFS - ORD

3 stops46h 40mMultiple Airlines

Deal found 14/9£532

Fri 31/1021:15ORD - BFS

3 stops20h 30mMultiple Airlines

Fri 7/1121:30BFS - ORD

3 stops47h 15mMultiple Airlines

Deal found 16/9£537

Fri 31/1017:11ORD - BHD

2 stops16h 04mAmerican Airlines

Mon 10/1106:35BHD - ORD

2 stops17h 17mAmerican Airlines

Deal found 14/9£546

Fly from

Fly to

Route

Depart

Return

Price

St. LouisBelfast

STL - BFS

STLBFS

Lambert-St Louis

Mon 29/9

13:26-23:10

2 stops27h 44m

Belfast Intl

Tue 7/10

06:45-22:04

2 stops21h 19m

£427

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 5/12

21:45-17:15

1 stop13h 30m

Belfast City

Tue 9/12

10:00-18:45

1 stop14h 45m

£463

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Thu 30/10

18:10-18:50

1 stop19h 40m

Belfast City

Mon 10/11

14:50-13:50

1 stop29h 00m

£470

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 3/10

16:15-16:55

1 stop18h 40m

Belfast City

Tue 7/10

06:30-14:10

1 stop13h 40m

£500

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 5/12

16:25-16:50

1 stop18h 25m

Belfast City

Tue 9/12

17:20-14:20

1 stop27h 00m

£500

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 31/10

18:10-10:30

1 stop11h 20m

Belfast City

Mon 10/11

14:50-18:45

1 stop33h 55m

£511

St. LouisBelfast

STL - BHD

STLBHD

Lambert-St Louis

Mon 29/9

19:59-17:30

2 stops15h 31m

Belfast City

Tue 7/10

09:35-21:29

2 stops17h 54m

£518

ChicagoBelfast

ORD - BHD

ORDBHD

Chicago O'Hare Intl

Fri 3/10

16:15-21:15

1 stop23h 00m

Belfast City

Tue 7/10

06:30-14:10

1 stop13h 40m

£529

ChicagoBelfast

ORD - BFS

ORDBFS

Chicago O'Hare Intl

Fri 31/10

21:15-22:45

3 stops20h 30m

Belfast Intl

Fri 7/11

21:30-14:45

3 stops47h 15m

£537

ChicagoBelfast

MDW - BHD

MDWBHD

Chicago Midway

Fri 3/10

09:20-21:15

2 stops29h 55m

Belfast City

Tue 7/10

06:30-18:25

2 stops17h 55m

£540

Flights are sorted by cheapest return flights first.

Deals found on 15/9

Showing 1-10 of 31 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

How much does it cost for a return flight from Illinois to Belfast?

Related info for your journey

How long is the flight from Illinois to Belfast?
For as low as £463, British Airways can have you in Belfast from Illinois in 13h 30m. 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.
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 City.
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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Denver to Belfast Intl flights

Miami to Belfast Intl flights

Denver to Belfast City flights

Minneapolis to Belfast City flights

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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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Cheap flights from Illinois to Belfast from £236

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 28/9. 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 17 September 2025.

Round-trip from

One-way from

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 17 September 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 17 September 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

How much does it cost for a return flight from Illinois to Belfast?

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.

How long is the flight from Illinois to Belfast?

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?

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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 17 September 2025.