How long is the flight from Illinois to Belfast?

For as low as £786, KLM can have you in Belfast from Illinois in 15h 54m. 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.

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 Lambert-St Louis - Belfast Intl.

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.

£250+ Cheap Flights from Illinois to Belfast

Cheap flight deals from Illinois to Belfast

Enter your travel dates to find the best prices.

Cheapest

Best

Last-minute

One-way

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 22 September 2026.

Mon 2/1119:15 -

2 stops21h 05m

Mon 9/1110:45 -

2 stops36h 00m

Deal found 17/9£520

Tue 3/1118:30 -

2 stops18h 20m

Tue 10/1107:05 -

2 stops16h 15m

Deal found 19/9£549

Fri 2/1014:20 -

2 stops24h 40m

Mon 5/1008:40 -

2 stops33h 55m

Deal found 18/9£635

Wed 25/1110:34 -

2 stops16h 36m

Wed 2/1209:40 -

2 stops19h 15m

Deal found 22/9£646

Sun 1/1118:30 -

2 stops20h 00m

Sun 8/1121:15 -

3 stops26h 05m

Deal found 16/9£666

Tue 24/1113:05 -

2 stops14h 05m

Wed 2/1209:40 -

2 stops19h 15m

Deal found 22/9£733

Mon 23/1111:27 -

2 stops15h 43m

Wed 2/1209:40 -

2 stops19h 15m

Deal found 22/9£846

Tue 20/1015:45 -

2 stops16h 05m

Thu 22/1007:00 -

2 stops18h 15m

Deal found 19/9£887

Tue 20/1015:45 -

2 stops20h 05m

Thu 22/1017:55 -

3 stops28h 05m

Deal found 19/9£942

Tue 20/1021:15 -

1 stop12h 05m

Thu 22/1020:35 -

1 stop23h 15m

Deal found 19/9£1,077

Mon 19/1019:05 -

1 stop11h 50m

Wed 21/1020:35 -

1 stop23h 15m

Deal found 20/9£1,109

Mon 16/1113:20 -

2 stops15h 30m

Wed 18/1117:35 -

2 stops31h 52m

Deal found 20/9£1,120

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 22 September 2026.

Mon 2/1119:15 -

2 stops21h 05m

Mon 9/1110:45 -

2 stops36h 00m

Deal found 17/9£520

Sun 31/110:40 -

2 stops16h 30m

Mon 8/217:20 -

2 stops29h 17m

Deal found 17/9£614

Fri 19/317:11 -

2 stops15h 54m

Sun 28/306:30 -

1 stop13h 20m

Deal found 20/9£786

Tue 3/1118:30 -

3 stops21h 30m

Tue 10/1120:55 -

2 stops23h 15m

Deal found 19/9£600

Wed 25/1110:34 -

2 stops16h 36m

Wed 2/1209:40 -

2 stops19h 15m

Deal found 22/9£646

Sat 30/116:25 -

1 stop18h 25m

Mon 8/217:20 -

2 stops29h 17m

Deal found 17/9£648

Fri 2/1019:05 -

2 stops20h 10m

Mon 5/1021:55 -

3 stops23h 00m

Deal found 18/9£656

Sun 1/1118:30 -

2 stops20h 00m

Sun 8/1121:15 -

3 stops26h 05m

Deal found 16/9£666

Fri 19/313:00 -

2 stops15h 10m

Sun 28/317:25 -

2 stops53h 00m

Deal found 20/9£1,697

Mon 23/1111:27 -

2 stops15h 43m

Wed 2/1209:40 -

2 stops19h 15m

Deal found 22/9£846

Sun 15/1117:10 -

1 stop11h 35m

Wed 18/1117:35 -

1 stop26h 10m

Deal found 20/9£1,109

Tue 20/1011:25 -

2 stops27h 55m

Thu 22/1008:10 -

2 stops31h 30m

Deal found 19/9£910

Mon 19/1019:05 -

1 stop11h 50m

Wed 21/1020:35 -

1 stop23h 15m

Deal found 18/9£1,110

Mon 16/1113:20 -

2 stops15h 30m

Wed 18/1117:35 -

2 stops31h 52m

Deal found 20/9£1,120

Thu 5/1116:05 -

2 stops15h 35m

Thu 12/1118:35 -

2 stops25h 10m

Deal found 21/9£1,172

Wed 25/1110:34 -

2 stops16h 36m

Mon 30/1109:40 -

2 stops19h 14m

Deal found 22/9£1,661

Tue 24/1113:05 -

2 stops14h 05m

Mon 30/1109:40 -

2 stops19h 14m

Deal found 22/9£1,748

Mon 23/1113:05 -

2 stops14h 05m

Mon 30/1109:40 -

2 stops19h 14m

Deal found 22/9£1,861

Sat 19/1211:47 -

2 stops15h 23m

Sat 2/109:40 -

2 stops18h 42m

Deal found 18/9£12,307

Find flight deals from Illinois to Belfast

Round-trip from	£520
One-way from	£250

2/11-9/11
4 total stops
57h 05m total
Illinois to Belfast

Search Deals

1/11-31/12
2 total stops
20h 00m total
Illinois to Belfast

Search Deals

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

Fastest return journey

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sun 1/11

18:30-20:30

2 stops20h 00m

Belfast Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£250

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Thu 8/10

14:20-23:00

3 stops26h 40m

Belfast Intl

Wed 31/12

00:00-17:00

Nonstop0h 00m

£365

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Mon 2/11

19:15-22:20

2 stops21h 05m

Belfast Intl

Mon 9/11

10:45-16:45

2 stops36h 00m

£520

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Tue 3/11

18:30-22:00

3 stops21h 30m

Belfast Intl

Tue 10/11

20:55-14:10

2 stops23h 15m

£600

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Sun 31/1

10:40-09:10

2 stops16h 30m

Belfast City

Mon 8/2

17:20-16:37

2 stops29h 17m

£614

ChicagoBelfast

MDW Chicago Midway - BHD Belfast City

MDWBHD

Chicago Midway

Wed 25/11

10:34-09:10

2 stops16h 36m

Belfast City

Wed 2/12

09:40-22:55

2 stops19h 15m

£646

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Sat 30/1

16:25-16:50

1 stop18h 25m

Belfast City

Mon 8/2

17:20-16:37

2 stops29h 17m

£648

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Fri 2/10

19:05-21:15

2 stops20h 10m

Belfast Intl

Mon 5/10

21:55-14:55

3 stops23h 00m

£656

ChicagoBelfast

ORD Chicago O'Hare Intl - BFS Belfast Intl

ORDBFS

Chicago O'Hare Intl

Sun 1/11

18:30-20:30

2 stops20h 00m

Belfast Intl

Sun 8/11

21:15-17:20

3 stops26h 05m

£666

ChicagoBelfast

ORD Chicago O'Hare Intl - BHD Belfast City

ORDBHD

Chicago O'Hare Intl

Fri 19/3

17:11-14:05

2 stops15h 54m

Belfast City

Sun 28/3

06:30-13:50

1 stop13h 20m

£786

Flights are sorted by cheapest return flights first.

Deals found on 17/9

Showing 1-10 of 21 resultsSorted by cheapest first

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.

ORD-BFS

ORD-BHD

MDW-BHD

STL-BHD

STL-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

USIL-BF1

ORD-BFS

ORD-BHD

MDW-BHD

STL-BHD

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

Related info for your journey

How long is the flight from Illinois to Belfast?
For as low as £786, KLM can have you in Belfast from Illinois in 15h 54m. 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 Lambert-St Louis - 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.

See more FAQs

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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 £250

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 1/11. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap 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 22 September 2026.

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 22 September 2026.

Best flights from Illinois to BelfastDiscover 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 22 September 2026.

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 22 September 2026.

Last-minute flights from Illinois to BelfastDiscover last-minute flight deals from Illinois to Belfast. Data last updated 22 September 2026 and is based on user searches.

Discover last-minute flight deals from Illinois to Belfast. Data last updated 22 September 2026 and is based on user searches.

One-way flights from Illinois to BelfastSearch for one-way flight options from Illinois to Belfast. Find affordable one-way fares based on user searches. Data last updated 22 September 2026.

Search for one-way flight options from Illinois to Belfast. Find affordable one-way fares based on user searches. Data last updated 22 September 2026.

Find flight deals from Illinois to Belfast

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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

Related info for your journey

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?

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.

Complete your trip

Complete your trip to Belfast 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 by cabin class

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

Illinois and Belfast flights

Browse other Illinois and Belfast flight options. Last updated on 22 September 2026.

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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 22 September 2026.

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 22 September 2026.

Last-minute flights from Illinois to Belfast
Discover last-minute flight deals from Illinois to Belfast. Data last updated 22 September 2026 and is based on user searches.

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 22 September 2026.