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 time of day to fly from IAG to IL?

When flying from Niagara Falls, New York 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.

What airport do you fly from for flights from Niagara Falls to Illinois?

Located just 5.7 mi from the city center, Niagara Falls (IAG) is the airport most travelers will use when flying to Illinois from Niagara Falls.

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

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

How can I find direct flights from Niagara Falls to Illinois?

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

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

Yes. Cheapflights offers flight deals from Niagara Falls 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.

$275+ Cheap Flights from Niagara Falls, NY to Illinois

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Cheap flight deals from Niagara Falls to Illinois

One-way

One-way flights from Niagara Falls to Illinois
Search for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Sun 9/1310:33 am -

2 stops53h 47m

Deal found 8/25

$275

Sun 10/412:22 pm -

3 stops51h 58m

Deal found 8/23

$287

Thu 10/111:22 am -

3 stops52h 58m

Deal found 8/25

$293

Thu 10/812:02 pm -

2 stops35h 37m

Deal found 8/24

$349

Find flight deals from Niagara Falls to Illinois

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

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Route

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Price

Cheapest one-way

Niagara FallsChicago

IAG Niagara Falls - ORD Chicago O'Hare Intl

IAGORD

Niagara Falls

Sun 9/13

10:33 am-3:20 pm

2 stops53h 47m

$275

Niagara FallsChicago

IAG Niagara Falls - ORD Chicago O'Hare Intl

IAGORD

Niagara Falls

Sun 10/4

12:22 pm-3:20 pm

3 stops51h 58m

$287

Niagara FallsChicago

IAG Niagara Falls - ORD Chicago O'Hare Intl

IAGORD

Niagara Falls

Thu 10/1

11:22 am-3:20 pm

3 stops52h 58m

$293

Quickest one-way

Niagara FallsChicago

IAG Niagara Falls - ORD Chicago O'Hare Intl

IAGORD

Niagara Falls

Thu 10/8

12:02 pm-10:39 pm

2 stops35h 37m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/25

Sorted by cheapest first

Best time to book a flight from Niagara Falls to Illinois

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

IAG-ORD

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 Niagara Falls to Illinois

IAG-USIL

IAG-ORD

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

Related info for your journey

What airport do you fly from for flights from Niagara Falls to Illinois?
Located just 5.7 mi from the city center, Niagara Falls (IAG) is the airport most travelers will use when flying to Illinois from Niagara Falls.
Can I find deals for flights from Niagara Falls to Illinois that include hotel bookings?
Yes. In addition to deals on Niagara Falls to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Niagara Falls to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Niagara Falls to Illinois.
Can I find deals for business class flights from Niagara Falls to Illinois?
Yes. Cheapflights offers flight deals from Niagara Falls 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.

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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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Niagara Falls 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 Niagara Falls to Illinois

One-way flights from Niagara Falls to Illinois
Search for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Search for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Find flight deals from Niagara Falls to Illinois

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Most trusted provider

Cheapflights Fare Finder

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

Best time to book a flight from Niagara Falls to Illinois

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

Cheapflights Insights

Related info for your journey

What airport do you fly from for flights from Niagara Falls to Illinois?

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

How can I find direct flights from Niagara Falls to Illinois?

Can I find deals for business class flights from Niagara Falls 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 Niagara Falls to Illinois

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

Complete your trip

Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Niagara Falls to Illinois by cabin class

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

Niagara Falls and Illinois flights

Browse other Niagara Falls and Illinois flight options. Last updated on August 25, 2026.

Popular flight searches

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$275+ Cheap flights from Niagara Falls, NY (IAG) to Illinois

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 9/13. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Niagara Falls 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 Niagara Falls to Illinois

One-way flights from Niagara Falls to IllinoisSearch for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Search for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.

Find flight deals from Niagara Falls to Illinois

Most accurate provider

Most trusted provider

Cheapflights Fare Finder

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

Best time to book a flight from Niagara Falls to Illinois

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

Cheapflights Insights

Related info for your journey

What airport do you fly from for flights from Niagara Falls to Illinois?

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

How can I find direct flights from Niagara Falls to Illinois?

Can I find deals for business class flights from Niagara Falls 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 Niagara Falls to Illinois

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

Complete your trip

Complete your trip to Illinois by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Niagara Falls to Illinois by cabin class

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

Niagara Falls and Illinois flights

Browse other Niagara Falls and Illinois flight options. Last updated on August 25, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

100% Free

Book with Flexibility

Travel Smart

One-way flights from Niagara Falls to Illinois
Search for one-way flight options from Niagara Falls to Illinois. Find affordable one-way fares based on user searches. Data last updated August 25, 2026.