Cheap flights To Northern Illinois (CHI) from $40

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Cheap Flights to Northern Illinois from $40 One Way, $68 Round Trip

Prices found within past 7 days. Prices and availability subject to change. Additional terms may apply.

Wed, Apr 8 - Wed, Apr 8
DEN
Denver Intl.
ORD
O'Hare Intl.
$68 Roundtrip, found 1 day ago
$68
Roundtrip
found 1 day ago
Select Frontier Airlines flight, departing Wed, Apr 8 from Denver Intl. to O'Hare Intl., returning Wed, Apr 8, priced at $68 found 1 day ago
Sat, Apr 18 - Sat, Apr 25
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$72 Roundtrip, found 4 days ago
$72
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sat, Apr 18 from Sky Harbor Intl. to O'Hare Intl., returning Sat, Apr 25, priced at $72 found 4 days ago
Fri, Mar 6 - Tue, Mar 10
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$73 Roundtrip, found 2 hours ago
$73
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Fri, Mar 6 from Sky Harbor Intl. to O'Hare Intl., returning Tue, Mar 10, priced at $73 found 2 hours ago
Thu, Apr 23 - Thu, Apr 30
DEN
Denver Intl.
ORD
O'Hare Intl.
$74 Roundtrip, found 2 hours ago
$74
Roundtrip
found 2 hours ago
Select Frontier Airlines flight, departing Thu, Apr 23 from Denver Intl. to O'Hare Intl., returning Thu, Apr 30, priced at $74 found 2 hours ago
Wed, Feb 11 - Sat, Feb 21
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$75 Roundtrip, found 6 days ago
$75
Roundtrip
found 6 days ago
Select Frontier Airlines flight, departing Wed, Feb 11 from Sky Harbor Intl. to O'Hare Intl., returning Sat, Feb 21, priced at $75 found 6 days ago
Mon, May 4 - Mon, May 11
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$76 Roundtrip, found 5 days ago
$76
Roundtrip
found 5 days ago
Select Frontier Airlines flight, departing Mon, May 4 from Sky Harbor Intl. to O'Hare Intl., returning Mon, May 11, priced at $76 found 5 days ago
Thu, Apr 23 - Sat, Apr 25
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$80 Roundtrip, found 3 days ago
$80
Roundtrip
found 3 days ago
Select Frontier Airlines flight, departing Thu, Apr 23 from Sky Harbor Intl. to O'Hare Intl., returning Sat, Apr 25, priced at $80 found 3 days ago
Mon, Apr 20 - Thu, Apr 23
DEN
Denver Intl.
ORD
O'Hare Intl.
$82 Roundtrip, found 21 hours ago
$82
Roundtrip
found 21 hours ago
Select Frontier Airlines flight, departing Mon, Apr 20 from Denver Intl. to O'Hare Intl., returning Thu, Apr 23, priced at $82 found 21 hours ago
Thu, Feb 19 - Mon, Feb 23
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$83 Roundtrip, found 7 hours ago
$83
Roundtrip
found 7 hours ago
Select Frontier Airlines flight, departing Thu, Feb 19 from Sky Harbor Intl. to O'Hare Intl., returning Mon, Feb 23, priced at $83 found 7 hours ago
Sun, May 10 - Sat, May 16
PHX
Sky Harbor Intl.
ORD
O'Hare Intl.
$85 Roundtrip, found 4 days ago
$85
Roundtrip
found 4 days ago
Select Frontier Airlines flight, departing Sun, May 10 from Sky Harbor Intl. to O'Hare Intl., returning Sat, May 16, priced at $85 found 4 days ago

Northern Illinois Flight Information

Traveling To
Northern Illinois
Destination Airport IATA Code
CHI
Number of Airlines Serving
Airlines
Frontier Airlines, American Airlines
Flight Price
$68
Earliest Departing Flight
Latest Departing Flight

Flights Review

Mar 10, 2018

Great overall service. Smooth landing. Plane was even early.

A verified traveler
Denver to Chicago · United

Book Your Flight & Hotel Together & Save

Northern Illinois economy flight packages

Price found within the past 48 hours. Click for updated prices.
La Banque Hotel
4.0-star property

La Banque Hotel

Mar 13 - Mar 16

3 night stay

Atlanta (ATL) to Chicago (ORD)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $616, price is now $366 per person
$366
per person
found 1 day ago
Hotel Riu Plaza Chicago
4.0-star property

Hotel Riu Plaza Chicago

Mar 19 - Mar 22

3 night stay

Atlanta (ATL) to Chicago (ORD)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $618, price is now $407 per person
$407
per person
found 1 day ago
Trump International Hotel & Tower Chicago
5.0-star property

Trump International Hotel & Tower Chicago

Mar 17 - Mar 19

2 night stay

Atlanta (ATL) to Chicago (ORD)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
Price was $652, price is now $445 per person
$445
per person
found 1 day ago
Don't see what you're looking for?
See all available trips from Atlanta to Northern Illinois
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Northern Illinois first class flight packages

Price found within the past 48 hours. Click for updated prices.
Aloft Chicago Downtown River North
3.5-star property

Aloft Chicago Downtown River North

9.4/10 Exceptional! (1,159 reviews)

Mar 1 - Mar 7

6 night stay

Newark Liberty Intl. Airport (EWR) to Chicago (ORD)

American Airlines • Roundtrip • FirstClass
Price was $1,051, price is now $843 per person
$843
per person
found 1 day ago
Great customer service. Friendly.

Reviewed on Nov 6, 2025

Waldorf Astoria Chicago
5.0-star property

Waldorf Astoria Chicago

9.4/10 Exceptional! (1,000 reviews)

Mar 1 - Mar 7

6 night stay

Newark Liberty Intl. Airport (EWR) to Chicago (ORD)

American Airlines • Roundtrip • FirstClass
Price was $2,220, price is now $1,833 per person
$1,833
per person
found 1 day ago
Lovely room and spacious bathroom plus all of the high end touches (robes, slippers to soft mats and towels and great bath products and loved the nespresso maker!) View was not great but gym and lobby made up for it; bar was too crowded and we couldn’t get a late checkout but at least it was noon and they held our bags for a few hours!

Reviewed on Dec 31, 2025

Virgin Hotels Chicago
4.5-star property

Virgin Hotels Chicago

9.2/10 Wonderful! (1,404 reviews)

Mar 1 - Mar 7

6 night stay

Newark Liberty Intl. Airport (EWR) to Chicago (ORD)

American Airlines • Roundtrip • FirstClass
Price was $1,167, price is now $979 per person
$979
per person
found 1 day ago
The location was great and made it easy to navigate about the city. The staff were all extremely friendly and helpful, and the perks of staying here were great. They offered a complimentary item from the coffee shop and hosted happy hour during my stay. My room was neat and well kept and a great place for me to land.

Reviewed on Jan 20, 2026

Don't see what you're looking for?
See all available trips from Newark Liberty Intl. Airport to Northern Illinois
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Northern Illinois

Save more on flights to Northern Illinois while making top-quality travel arrangements. At Orbitz we provide access to low cost flights, hotel lodgings and other discounts, along with superior customer service and an unbeatable satisfaction guarantee.

Compare And Book Discount Flights to Northern Illinois

Now it is easier than ever to find a discount Northern Illinois flight. Orbitz users can compare airfares for both international and domestic flights and can quickly determine the best hotels and car rental companies to use. You may also check out hotel and other reviews along with a number of travel tips, making your visit to an unfamiliar destination enjoyable and hassle-free.

Use Your Mobile Phone To Secure A Low Cost Flight To Northern Illinois

We now offer free apps for the most commonly used mobile devices. You can use your mobile phone to share relevant information pertaining to your trips, view images of local lodgings and take advantage of hotel and car rental discounts that may be available only to mobile device users.

Boost Your Frequent Flyer Rewards

You even retain your ability to earn frequent flier points and rewards when purchasing your tickets with Orbitz for Northern Illinois flights. Enter your frequent flyer information into your Orbitz profile to start earning rewards.

You will find that Orbitz is a very low cost, yet very effective travel planner. Free updates via your mobile phone device will help to keep you and all relevant parties informed of important flight updates. With access to unbeatable sales on all travel essentials, Orbitz makes booking an affordable flight to Northern Illinois a breeze.

Frequently asked questions

What is the best airport to fly to in Northern Illinois?
Williamson County Regional Airport (MWA) is the major gateway for this terrific destination. Once you've stepped out of the terminal, the possibilities are endless when it comes to adventuring around Northern Illinois.
How much is a flight to Northern Illinois?
Travelers from far and wide bagged round-trip bargains ranging from $68 to $85 this week. Kicking off your journey from Phoenix (PHX)? The cheapest one-way prices were just $40.
How to book the cheapest flight to Northern Illinois?
Scoring cheap flights to Northern Illinois is as easy as booking with Orbitz. But if you'd like to make sure you're walking away with the best flight deals around, here are some tips to keep in mind:

  • Departing from or landing at nearby airports can often be more affordable. Enter your preferred departure and arrival points. Next, select the 'Nearby airports' function below to explore your options.
  • Similarly, click on the 'Show flexible dates' link to compare the prices on days either side of your chosen departure. It's possible to find cheaper flight deals if your travel dates are flexible.
  • Select 'Show options' to narrow down your search results. You can pick your preferred seating class and airline here. Under 'Sort & Filter' to the left, you can even specify whether you'd like to fly in the morning, afternoon or evening.
  • The early bird gets the best savings, so purchase your seats once you've settled on your travel dates. The most affordable fares get snapped up first and prices normally increase as the departure date nears.
  • Consider bundling your hotels, flights and car rentals into an Orbitz package to make your dollar go further.
  • Don't fly during the busy season if you can. By avoiding summer, school vacations and other popular dates, you can save big on your airfares.

What is the best time to book a flight to Northern Illinois?
Book in January, February or August for unbeatable fares to Northern Illinois. Once you've found a bargain, lock it in — cheap flights are known to appear and then vanish in the click of a button.
What day of the week is the cheapest to book a flight to Northern Illinois?
In general, Tuesdays, Wednesdays and Saturdays are the cheapest days of the week to book a flight to Northern Illinois. If you want the best airfares, search across those days and you're likely to catch an excellent flight deal.
What is the cheapest day of the week to fly to Northern Illinois?
You can land cheap flights to Northern Illinois by flying out on a Monday, according to Orbitz data from 2020. Tuesday is also more affordable, while Saturday has the most costly ticket prices. Whether you prefer to save a bundle or fly out on whichever day is convenient, you'll always get a terrific deal with Orbitz.
What is the cheapest month to fly to Northern Illinois?
Consider traveling in August if you don't want to put a dent in your budget. Orbitz data has found that it's generally the best month for cheap flights to Northern Illinois. June is when fares really go up.
Which airlines allow free cancellation?
When you search for flights on Orbitz, select "Filter by flexible change policies." This filter will quickly find all the airlines offering free cancellation within 24 hours of booking and no change fees. That means you can relax knowing that if your travel dates change, your flight can too.
What do I need for the flight to Northern Illinois?
Flying can be fun with a little pre-planning! Make your flight a relaxing one with these helpful tips:

  • Whether you print it out or use an electronic one, you'll need your boarding pass to step foot on the plane. You'll also need some kind of government-issued photo identification. If you're flying internationally, make sure your passport is valid and you've looked into visa requirements.
  • Take some activities to keep you amused on your journey to Northern Illinois. Books, magazines and electronic gadgets like laptops and tablets are good ideas. Be sure to take a refillable water bottle with you too. Even on a short flight, it's important to keep well-hydrated.
  • It can get very cool on the plane. If you'd prefer not to shiver your way through the flight, layer up.

How many direct flights are there to Northern Illinois?
With 13 direct flights each month, getting to Northern Illinois doesn't have to be long and stressful. Cape Air offers nonstop services to this bustling destination.
How do I get cheap first-class/business deals to Northern Illinois?
If you think a business or first-class airfare is beyond your grasp, think again. Here are some terrific tips to help you book a premium flight to Northern Illinois for less:

  • Flexibility is everything. By being open to different travel dates, you'll have more chances of spotting a sale on first or business-class airfares.
  • Find a budget airline that has business-class seats. They usually come with more space and a glass of bubbly — and a more appealing price.
  • Bid for an upgrade in online auctions (if available) or upgrade your seat through your frequent flyer program.

What is the best time to go to Northern Illinois?
Northern Illinois is a wonderful getaway destination year-round, but the most popular months are June, July and August. If you're into warm weather, make your way there during the summer months. Like most places in the Northern Hemisphere, the summer season commences June 20. At this time, temperatures usually float between 65 ºF and 80 ºF during the daytime.

More to Explore

Fare, taxes & fees: Fares include all taxes and fees, except baggage fees. Rates shown reflect fares found by other Orbitz users over the past 7 days. Due to rapidly changing airline prices & seat availability, these fares may no longer be available.

Refunds/changes/cancellations: Itinerary changes, if permitted for the fare, will have a $30 service fee charged by Orbitz. Additional airline charges may apply.

Other conditions: Schedules, fares and rules are subject to change without notice. Seats are limited and may not be available on all flights/dates or in all markets. Lower fares may be available. Fares will not be honored retroactively or in exchange for any wholly/partially unused ticket. Tickets are non-transferable and non-refundable. Fare rules are provided for the selected itinerary before booking.