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Cheap flights from Illinois to Belfast from £267

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 8/9. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — BHD
4 Sep — 11 Sep1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Illinois to Belfast

Enter your travel dates to find the best prices.

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 5 August 2026.

Wed 16/914:15 -
2 stops20h 50m
Wed 23/920:10 -
3 stops28h 05m
Deal found 2/8£512
Tue 1/919:25 -
2 stops16h 25m
Tue 8/909:50 -
2 stops17h 35m
Deal found 2/8£638
Tue 1/921:15 -
1 stop12h 05m
Tue 8/909:40 -
1 stop14h 35m
Deal found 2/8£684
Wed 25/1118:30 -
2 stops15h 00m
Sun 29/1111:10 -
2 stops35h 05m
Deal found 4/8£713
Thu 17/919:05 -
1 stop17h 40m
Thu 24/906:30 -
1 stop15h 25m
Deal found 3/8£726
Fri 18/920:50 -
1 stop15h 20m
Fri 25/906:30 -
1 stop14h 25m
Deal found 4/8£734
Fri 18/916:01 -
2 stops17h 29m
Fri 25/906:30 -
1 stop15h 25m
Deal found 4/8£739
Wed 25/1116:25 -
1 stop10h 45m
Sun 29/1117:20 -
1 stop27h 05m
Deal found 4/8£757
Sat 19/916:20 -
1 stop10h 55m
Sat 26/917:30 -
1 stop26h 45m
Deal found 5/8£772
Fri 18/913:00 -
2 stops21h 55m
Fri 25/909:50 -
2 stops18h 54m
Deal found 4/8£813
Sat 19/919:13 -
2 stops15h 42m
Sat 26/917:30 -
2 stops30h 49m
Deal found 5/8£974
Sat 12/914:40 -
2 stops12h 55m
Sun 13/922:10 -
3 stops28h 10m
Deal found 3/8£1,027

Find flight deals from Illinois to Belfast

Keep the following information in mind while searching for Illinois to Belfast flight deals. Data was last updated 5 August 2026.

Round-trip from

£512

One-way from

£267
16/9-23/9
  • 16/9-23/9
  • 5 total stops
  • 48h 55m total
  • Illinois to Belfast
Search Deals
8/9
  • 8/9
  • 2 total stops
  • 21h 55m total
  • Illinois to Belfast
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Illinois to Belfast 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 5 August 2026.
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

Cheapest return flight

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Wed 16/9

14:15-17:05

2 stops20h 50m

Belfast Intl

Wed 23/9

20:10-18:15

3 stops28h 05m

£521

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Mon 14/9

19:25-16:15

2 stops14h 50m

Belfast Intl

Mon 21/9

19:35-09:40

3 stops44h 05m

£620

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Tue 15/9

19:25-21:20

2 stops19h 55m

Belfast Intl

Tue 22/9

13:15-14:00

2 stops30h 45m

£649

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Sun 24/1

21:50-18:40

1 stop14h 50m

Belfast City

Thu 28/1

09:05-18:45

1 stop15h 40m

£664

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sat 19/9

19:25-23:25

2 stops22h 00m

Belfast Intl

Sat 26/9

06:00-09:40

3 stops33h 40m

£670

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sat 12/9

22:25-22:40

2 stops18h 15m

Belfast Intl

Sun 20/9

20:25-19:15

2 stops28h 50m

£676
Fastest return journey

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Tue 1/9

21:15-15:20

1 stop12h 05m

Belfast City

Tue 8/9

09:40-18:15

1 stop14h 35m

£684

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Tue 1/9

09:50-17:50

2 stops26h 00m

Belfast City

Tue 8/9

07:00-19:48

3 stops18h 48m

£690

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Thu 17/9

19:05-18:45

1 stop17h 40m

Belfast City

Thu 24/9

06:30-15:55

1 stop15h 25m

£726

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Wed 25/11

16:25-09:10

1 stop10h 45m

Belfast City

Sun 29/11

17:20-14:25

1 stop27h 05m

£757

Flights are sorted by cheapest return flights first.

Deals found on 5/8

Showing 1-10 of 30 resultsSorted by cheapest first
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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

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 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?

    For as low as £1,811, British Airways can have you in Belfast from Illinois in 13h 48m. Airlines will cover a distance of 3647 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.

See more FAQs

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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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