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

Currently, January is the cheapest month in which you can book a flight from Belfast to Illinois (average of £595). Flying from Belfast to Illinois in July is currently the most expensive (average of £843). 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 is the cheapest month to fly from Belfast to Illinois?

September can be a great time to fly to Illinois from Belfast with a flight ticket averaging about £656. Cheapflights users have found deals in the month of September for as cheap as £460. The most expensive prices can be found in the month of August.

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

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

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

How can I find direct flights from Belfast to Illinois?

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

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

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

£466+ Flights from Belfast to Illinois

Cheap flight deals from Belfast to Illinois

Round-trip from	£466
Popular in	August
Cheapest in	September
Average price	£656

British Airways
22/9-29/9
2 total stops
28h 25m total
Belfast to Illinois

Search Deals

Highest demand for flights based on searches. 1% potential increase in price (£9 potential increase over avg. return price).

Search Deals

Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).

Search Deals

Average for round-trip flights in June 2025

Search Deals

Find flight deals from Belfast to Illinois

Cheapest flights from Belfast to Illinois
Explore the most affordable flight options available from Belfast to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 6월 2025.

월 22/906:40BHD - ORD

1 stop14h 10mBritish Airways

월 29/921:15ORD - BHD

1 stop14h 15mBritish Airways

Deal found 10/6£466

월 22/917:25BHD - ORD

1 stop26h 45mKLM

월 29/917:45ORD - BHD

2 stops17h 10mKLM

Deal found 10/6£484

일 7/915:50BHD - ORD

1 stop26h 00mMultiple Airlines

일 14/917:45ORD - BHD

1 stop13h 20mMultiple Airlines

Deal found 10/6£492

화 15/705:55BFS - ORD

2 stops22h 10mMultiple Airlines

화 22/719:25ORD - BFS

2 stops13h 35mMultiple Airlines

Deal found 11/6£642

목 14/817:25BHD - ORD

2 stops30h 40mVirgin Atlantic

목 21/816:20ORD - BHD

1 stop18h 35mVirgin Atlantic

Deal found 10/6£757

월 4/818:50BHD - ORD

2 stops25h 10mAer Lingus

월 11/815:45ORD - BHD

2 stops15h 05mAer Lingus

Deal found 10/6£962

월 28/717:25BHD - ORD

1 stop26h 45mDelta

일 3/816:20ORD - BHD

1 stop22h 55mDelta

Deal found 12/6£3,566

화 29/706:35BHD - ORD

1 stop14h 05mAmerican Airlines

금 8/821:15ORD - BHD

1 stop12h 15mAmerican Airlines

Deal found 12/6£3,598

Best flights from Belfast to Illinois
Discover carefully curated flight deals from Belfast to Illinois that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 13 6월 2025.

월 22/906:40BHD - ORD

1 stop14h 10mBritish Airways

월 29/921:15ORD - BHD

1 stop14h 15mBritish Airways

Deal found 10/6£466

월 22/917:25BHD - ORD

1 stop26h 45mKLM

월 29/917:45ORD - BHD

2 stops17h 10mKLM

Deal found 10/6£484

일 7/915:50BHD - ORD

1 stop26h 00mMultiple Airlines

일 14/917:45ORD - BHD

1 stop13h 20mMultiple Airlines

Deal found 10/6£492

목 14/817:25BHD - ORD

2 stops30h 40mVirgin Atlantic

목 21/816:20ORD - BHD

1 stop18h 35mVirgin Atlantic

Deal found 10/6£757

월 4/818:50BHD - ORD

2 stops25h 10mAer Lingus

월 11/815:45ORD - BHD

2 stops15h 05mAer Lingus

Deal found 10/6£962

화 15/705:55BFS - ORD

2 stops22h 10mMultiple Airlines

화 22/719:25ORD - BFS

2 stops13h 35mMultiple Airlines

Deal found 11/6£642

월 28/717:25BHD - ORD

1 stop26h 45mDelta

일 3/816:20ORD - BHD

1 stop22h 55mDelta

Deal found 12/6£3,566

화 29/706:35BHD - ORD

1 stop14h 05mAmerican Airlines

금 8/821:15ORD - BHD

1 stop12h 15mAmerican Airlines

Deal found 12/6£3,598

Last-minute flights from Belfast to Illinois
Discover last-minute flight deals from Belfast to Illinois. Data last updated 13 6월 2025 and is based on user searches.

월 30/619:30BHD - ORD

1 stop22h 25mMultiple Airlines

월 7/718:25ORD - BHD

2 stops15h 15mMultiple Airlines

Deal found 11/6£570

월 30/606:30BHD - ORD

2 stops15h 48mKLM

월 7/719:01ORD - BHD

2 stops15h 54mKLM

Deal found 11/6£695

월 7/712:15BHD - ORD

2 stops25h 04mBritish Airways

월 14/721:15ORD - BHD

1 stop14h 15mBritish Airways

Deal found 10/6£596

화 15/705:55BFS - ORD

2 stops22h 10mMultiple Airlines

화 22/719:25ORD - BFS

2 stops13h 35mMultiple Airlines

Deal found 11/6£642

일 27/706:30BHD - ORD

2 stops22h 21mVirgin Atlantic

일 3/819:59ORD - BHD

2 stops38h 56mVirgin Atlantic

Deal found 10/6£768

월 28/717:25BHD - ORD

1 stop26h 45mDelta

일 3/816:20ORD - BHD

1 stop22h 55mDelta

Deal found 12/6£3,566

화 29/709:35BHD - ORD

1 stop13h 25mAmerican Airlines

토 9/816:55ORD - BHD

1 stop11h 15mAmerican Airlines

Deal found 12/6£3,598

수 30/707:00BHD - ORD

2 stops18h 00mAer Lingus

수 6/815:45ORD - BHD

2 stops16h 00mAer Lingus

Deal found 12/6£2,791

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

BelfastChicago

BHD - ORD

BHDORD

Belfast City

월 22/9

06:40-14:50

1 stop14h 10m

Chicago O'Hare Intl

월 29/9

21:15-17:30

1 stop14h 15m

£466

BelfastChicago

BHD - ORD

BHDORD

Belfast City

월 22/9

17:25-14:10

1 stop26h 45m

Chicago O'Hare Intl

월 29/9

17:45-16:55

2 stops17h 10m

£484

BelfastChicago

BHD - ORD

BHDORD

Belfast City

일 7/9

15:50-11:50

1 stop26h 00m

Chicago O'Hare Intl

일 14/9

17:45-13:05

1 stop13h 20m

£492

BelfastChicago

BFS - ORD

BFSORD

Belfast Intl

화 15/7

05:55-22:05

2 stops22h 10m

Chicago O'Hare Intl

화 22/7

19:25-15:00

2 stops13h 35m

£642

BelfastChicago

BHD - ORD

BHDORD

Belfast City

목 14/8

17:25-18:05

2 stops30h 40m

Chicago O'Hare Intl

목 21/8

16:20-16:55

1 stop18h 35m

£757

BelfastChicago

BHD - ORD

BHDORD

Belfast City

월 4/8

18:50-14:00

2 stops25h 10m

Chicago O'Hare Intl

월 11/8

15:45-12:50

2 stops15h 05m

£962

BelfastChicago

BHD - ORD

BHDORD

Belfast City

월 28/7

06:30-14:10

1 stop13h 40m

Chicago O'Hare Intl

월 4/8

16:20-21:15

1 stop22h 55m

£3,566

BelfastChicago

BHD - ORD

BHDORD

Belfast City

화 29/7

06:35-14:40

1 stop14h 05m

Chicago O'Hare Intl

금 8/8

21:15-15:30

1 stop12h 15m

£3,598

Flights are sorted by cheapest return flights first.

Deals found on 10/6

Best time to book a flight from Belfast to Illinois

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

Rainfall in Illinois by month

In terms of precipitation, rainfall in Illinois ranges from 43.0 - 125.0 inches per month. August is typically the wettest month, when rainfall can reach 125.0 mm. January is typically the driest time to visit Illinois when rainfall is around 43.0 mm.

Temperature in Illinois by month

If weather is an important factor for your trip to Illinois, 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 23.0 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 Illinois

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Delta

8.0

Very Good

7,950 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

KLM

7.8

Good

1,358 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Virgin Atlantic

7.4

Good

652 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

American Airlines

7.2

Good

10,000 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Aer Lingus

7.1

Good

1,118 reviews

Delta

8.0

Very Good

7,950 reviews

Check prices

Reviews

1 / 20

10.0

Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Can I find deals for flights from Belfast to Illinois that include hotel bookings?
Yes. In addition to deals on Belfast to Illinois flights, Cheapflights offers holiday packages that include both flights and hotel.
How can I find direct flights from Belfast to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast to Illinois.
Can I find deals for business class flights from Belfast to Illinois?
Yes. Cheapflights offers flight deals from Belfast to Illinois 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 Belfast to Illinois?
Currently, January is the cheapest month in which you can book a flight from Belfast to Illinois (average of £595). Flying from Belfast to Illinois in July is currently the most expensive (average of £843). 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 Belfast to Illinois

Belfast Intl to John F Kennedy Intl flights

Belfast Intl to Newark flights

Belfast City to John F Kennedy Intl flights

Belfast City to Newark flights

Belfast Intl to O'Hare Intl flights

Belfast City to Santa Ana flights

Belfast City to LaGuardia flights

Belfast Intl to Ontario flights

Belfast Intl to Stewart flights

Belfast Intl to Miami flights

Belfast Intl to Santa Ana flights

Belfast Intl to Orlando flights

Belfast City to Miami flights

Belfast City to O'Hare Intl flights

Belfast Intl to Boston flights

Belfast City to Los Angeles flights

Belfast Intl to Los Angeles flights

Belfast City to Orlando flights

Belfast City to Boston flights

Belfast Intl to Detroit flights

Belfast City to San Francisco flights

Belfast Intl to Seattle flights

Belfast Intl to Las Vegas flights

Belfast City to Charlotte flights

Belfast Intl to Atlanta flights

Belfast Intl to San Francisco flights

Belfast City to Las Vegas flights

Belfast City to Atlanta flights

Belfast City to Detroit flights

Belfast City to Seattle flights

Belfast Intl to Manchester flights

Belfast Intl to Fort Lauderdale flights

Belfast Intl to Charlotte flights

Belfast City to Dulles Intl flights

Belfast City to Baltimore flights

Belfast City to San Antonio flights

Belfast Intl to Denver flights

Belfast City to Oklahoma City flights

Belfast Intl to San Antonio flights

Belfast Intl to West Palm Beach flights

Belfast Intl to Wichita flights

Belfast City to Grand Rapids flights

Belfast Intl to George Bush Intcntl flights

Belfast City to Minneapolis flights

Belfast City to New Orleans flights

Belfast Intl to Jacksonville flights

Complete your trip

Illinois car hire

Chicago O'Hare Intl Airport car hire

Chicago Midway Airport car hire

Moline Quad-City Airport car hire

Greater Peoria Airport car hire

Bloomington-Normal Airport car hire

Champaign University-Willard Airport car hire

Springfield Capital Airport car hire

Chicago Greater Rockford Airport car hire

Belleville Airport car hire

Marion Williamson County Airport car hire

Quincy Regional Airport car hire

Direct flights to United States

Top airline flying from Belfast to Illinois

Airline	Cheapest	Average	Flexibility	On-time
British Airways	Cheapest£478	Average£590	FlexibilityNo cancel fee	On-time70%	Search British Airways flights

Fly with Cheapflights

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

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

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

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Belfast to Illinois for you. Better yet — we are completely free to use.

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

Need flexible booking options for your flight to Illinois from Belfast? 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 Belfast to Illinois become cheaper?

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

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

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 Belfast to Illinois from £466

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 22/9. Fares are subject to change and may not be available on all flights or dates of travel.

Cheap flight deals from Belfast to Illinois

Keep the following information in mind while searching for Belfast to Illinois flight deals. Data was last updated 13 6월 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Belfast to Illinois

Cheapest flights from Belfast to IllinoisExplore the most affordable flight options available from Belfast to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 6월 2025.

Explore the most affordable flight options available from Belfast to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 6월 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Belfast to Illinois

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

Cheapflights Insights

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

Rainfall in Illinois by month

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

Temperature in Illinois by month

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

Reviews of airlines servicing Illinois

Related info for your journey

Find useful and relevant information for your journey from Belfast to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

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

How can I find direct flights from Belfast to Illinois?

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

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

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 Belfast to Illinois

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

Top airline flying from Belfast to Illinois

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 Belfast to Illinois?

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

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

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

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from Belfast to Illinois
Explore the most affordable flight options available from Belfast to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 13 6월 2025.