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

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

While some choose either Chicago Midway - Belfast Intl or Lambert-St Louis - Belfast Intl, Chicago O'Hare Intl - Belfast Intl is the most popular route from Illinois to Belfast Intl Airport.

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

When flying from Illinois to Belfast Intl Airport, 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 Intl that include hotel bookings?

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

How can I find direct flights from Illinois to Belfast Intl?

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

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

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

£234+ Cheap Flights from Illinois to Belfast Intl Airport

Cheap flight deals from Illinois to Belfast Intl

Enter your travel dates to find the best prices.

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Best

Last-minute

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Cheapest flights from Illinois to Belfast Intl
Explore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 September 2026.

Tue 13/1019:15 -

2 stops22h 35m

Tue 20/1014:50 -

2 stops31h 20m

Deal found 29/8£647

Tue 22/919:25 -

2 stops19h 40m

Wed 30/906:10 -

2 stops21h 15m

Deal found 31/8£673

Sun 27/911:25 -

2 stops28h 30m

Sun 4/1012:20 -

2 stops27h 20m

Deal found 30/8£734

Sun 11/1011:25 -

2 stops28h 30m

Sun 18/1012:20 -

2 stops27h 20m

Deal found 30/8£736

Sat 12/915:45 -

2 stops17h 15m

Tue 15/913:15 -

3 stops32h 45m

Deal found 30/8£923

Find flight deals from Illinois to Belfast Intl

Round-trip from	£647
One-way from	£234

13/10-20/10
4 total stops
53h 55m total
Illinois to Belfast

Search Deals

5/10
3 total stops
21h 55m total
Illinois to Belfast

Search Deals

Cheapflights Fare Finder

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

Tue 13/10

19:15-23:50

2 stops22h 35m

Belfast Intl

Tue 20/10

14:50-16:10

2 stops31h 20m

£647

Fastest return journey

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Tue 22/9

19:25-21:05

2 stops19h 40m

Belfast Intl

Wed 30/9

06:10-21:25

2 stops21h 15m

£673

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Wed 17/2

18:30-19:45

3 stops19h 15m

Belfast Intl

Mon 1/3

17:30-17:20

3 stops29h 50m

£702

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Tue 23/2

18:30-20:10

2 stops19h 40m

Belfast Intl

Sat 6/3

12:30-15:30

3 stops33h 00m

£720

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sun 27/9

11:25-21:55

2 stops28h 30m

Belfast Intl

Sun 4/10

12:20-09:40

2 stops27h 20m

£734

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sun 11/10

19:25-23:35

3 stops22h 10m

Belfast Intl

Sun 18/10

07:00-21:25

3 stops20h 25m

£807

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sat 12/9

15:45-15:00

2 stops17h 15m

Belfast Intl

Tue 15/9

13:15-16:00

3 stops32h 45m

£923

Cheapest one-way

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Mon 28/9

19:25-07:05

2 stops29h 40m

£236

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Mon 5/10

19:25-20:40

2 stops19h 15m

£243

Fastest single journey

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Wed 7/10

22:25-15:55

2 stops11h 30m

£256

Flights are sorted by cheapest return flights first.

Deals found on 29/8

Showing 1-10 of 11 resultsSorted by cheapest first

Best time to book a flight from Illinois to Belfast Intl

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

ORD-BFS

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 Intl Airport

USIL-BFS

ORD-BFS

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

Related info for your journey

What are the most popular routes from Illinois to Belfast Intl Airport?
While some choose either Chicago Midway - Belfast Intl or Lambert-St Louis - Belfast Intl, Chicago O'Hare Intl - Belfast Intl is the most popular route from Illinois to Belfast Intl Airport.
Can I find deals for flights from Illinois to Belfast Intl that include hotel bookings?
Yes. In addition to deals on Illinois to Belfast Intl flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Illinois to Belfast Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Belfast Intl.
Can I find deals for business class flights from Illinois to Belfast Intl?
Yes. Cheapflights offers flight deals from Illinois to Belfast Intl by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Illinois to Belfast Intl. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

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Millions of users choose and trust Cheapflights to book the best flight deals from Illinois to Belfast Intl for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

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Yes! Cheapflights helps users easily find flights from Illinois to Belfast Intl with no change fees.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Belfast Intl from Illinois today and book when prices fit your budget.

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Cheap flights from Illinois to Belfast Intl Airport from £234

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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Illinois to Belfast Intl

Cheapest flights from Illinois to Belfast IntlExplore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 September 2026.

Explore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 September 2026.

Best flights from Illinois to Belfast IntlDiscover carefully curated flight deals from Illinois to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 September 2026.

Discover carefully curated flight deals from Illinois to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 September 2026.

Last-minute flights from Illinois to Belfast IntlDiscover last-minute flight deals from Illinois to Belfast Intl. Data last updated 3 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Belfast Intl. Data last updated 3 September 2026 and is based on user searches.

One-way flights from Illinois to Belfast IntlSearch for one-way flight options from Illinois to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 3 September 2026.

Search for one-way flight options from Illinois to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 3 September 2026.

Find flight deals from Illinois to Belfast Intl

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Use the filters below to find and compare flights from Illinois to Belfast Intl Airport that are best for you.

Best time to book a flight from Illinois to Belfast Intl

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

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Related info for your journey

What are the most popular routes from Illinois to Belfast Intl Airport?

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

How can I find direct flights from Illinois to Belfast Intl?

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

Travelling to a place near Belfast Intl Airport?

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Illinois to Belfast Intl

See prices for flight routes from nearby airports that may be better suited for you.

Other flights to Belfast Intl

Explore flights to Belfast Intl departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on 3 September 2026.

Complete your trip

Complete your trip to Belfast Intl by adding a car hire and/or hotel booking to your travel itinerary.

Direct flights to Northern Ireland

Book a non-stop flight to one of these other cities located in Northern Ireland.

Search flights from Illinois to Belfast Intl by cabin class

Find flights from Illinois to Belfast Intl, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Illinois and Belfast Intl flights

Browse other Illinois and Belfast Intl flight options. Last updated on 3 September 2026.

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Cheapest flights from Illinois to Belfast Intl
Explore the most affordable flight options available from Illinois to Belfast Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 September 2026.

Best flights from Illinois to Belfast Intl
Discover carefully curated flight deals from Illinois to Belfast Intl that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 3 September 2026.

Last-minute flights from Illinois to Belfast Intl
Discover last-minute flight deals from Illinois to Belfast Intl. Data last updated 3 September 2026 and is based on user searches.

One-way flights from Illinois to Belfast Intl
Search for one-way flight options from Illinois to Belfast Intl. Find affordable one-way fares based on user searches. Data last updated 3 September 2026.