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

Currently, August is the cheapest month in which you can book a flight from Belfast Intl Airport to Illinois (average of $245). Flying from Belfast Intl Airport to Illinois in March is currently the most expensive (average of $321). 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 Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

What is the cheapest month to fly from Belfast Intl Airport to Illinois?

September is one of the best times of the year to fly to Illinois from Belfast Intl Airport. Prices for September average $890 per person but you can even find prices for as low as $625. The most expensive prices can be found in the month of August. Opting for a September flight can save you 29% on your journey compared to booking in August

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Belfast Intl Airport to Illinois as you normally would.

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

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

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

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

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

Yes. Cheapflights offers flight deals from Belfast Intl 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.

$821+ Flights from Belfast Intl Airport to Illinois

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Cheap flight deals from Belfast Intl to Illinois

Round-trip from	$821 (Mytrip)
Popular in	August
Cheapest in	September
Average price	$840

From Belfast Intl to Illinois

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Highest demand for flights based on searches. 1% potential increase in price ($18 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($30 potential savings vs. average RT price).

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Average for round-trip flights in July 2025

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Cheapest flights from Belfast Intl to Illinois
Explore the most affordable flight options available from Belfast Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Thu 8/216:00 amBFS - ORD

2 stops19h 29mMultiple Airlines

Mon 8/2510:15 pmORD - BFS

2 stops13h 05mMultiple Airlines

Deal found 7/2

$821

Best flights from Belfast Intl to Illinois
Discover carefully curated flight deals from Belfast Intl to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Thu 8/216:00 amBFS - ORD

2 stops19h 29mMultiple Airlines

Mon 8/2510:15 pmORD - BFS

2 stops13h 05mMultiple Airlines

Deal found 7/2

$821

Last-minute flights from Belfast Intl to Illinois
Discover last-minute flight deals from Belfast Intl to Illinois. Data last updated July 3, 2025 and is based on user searches.

Thu 8/216:00 amBFS - ORD

2 stops19h 29mMultiple Airlines

Mon 8/2510:15 pmORD - BFS

2 stops13h 05mMultiple Airlines

Deal found 7/2

$821

Cheapflights Fare Finder

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

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Route

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Return

Price

BelfastChicago

BFS - ORD

BFSORD

Belfast Intl

Thu 8/21

6:00 am-7:29 pm

2 stops19h 29m

Chicago O'Hare Intl

Mon 8/25

10:15 pm-5:20 pm

2 stops13h 05m

$821

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

Best time to book a flight from Belfast Intl to Illinois

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

Estimated round-trip 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.

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

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Related info for your journey

Can I find deals for flights from Belfast Intl to Illinois that include hotel bookings?
Yes. In addition to deals on Belfast Intl to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Belfast Intl to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Belfast Intl to Illinois.
Can I find deals for business class flights from Belfast Intl to Illinois?
Yes. Cheapflights offers flight deals from Belfast Intl 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 Intl Airport to Illinois?
Currently, August is the cheapest month in which you can book a flight from Belfast Intl Airport to Illinois (average of $245). Flying from Belfast Intl Airport to Illinois in March is currently the most expensive (average of $321). 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.

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$821+ Cheap flights from Belfast Intl (BFS) to Illinois

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/21. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Belfast Intl to Illinois with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Belfast Intl to Illinois

Keep the following information in mind while searching for Belfast Intl to Illinois flight deals. Data was last updated July 3, 2025.

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Belfast Intl to Illinois

Cheapest flights from Belfast Intl to IllinoisExplore the most affordable flight options available from Belfast Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Explore the most affordable flight options available from Belfast Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from Belfast Intl to Illinois

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

Cheapflights Insights

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

Related info for your journey

Find useful and relevant information for your journey from Belfast Intl 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 Intl to Illinois that include hotel bookings?

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

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

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

Browse thousands of different options on Cheapflights for your next trip

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Cheapest flights from Belfast Intl to Illinois
Explore the most affordable flight options available from Belfast Intl to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.