Cheap flights To Northern Illinois (CHI) from $43

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Cheap Flights to Northern Illinois from $43 One Way, $108 Round Trip

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

Thu, Aug 7 - Tue, Aug 19
SAN
San Diego Intl.
ORD
O'Hare Intl.
$108 Roundtrip, found 2 days ago
$108
Roundtrip
found 2 days ago
Select Spirit Airlines flight, departing Thu, Aug 7 from San Diego Intl. to O'Hare Intl., returning Tue, Aug 19, priced at $108 found 2 days ago
Wed, Aug 13 - Tue, Aug 19
SAN
San Diego Intl.
ORD
O'Hare Intl.
$121 Roundtrip, found 4 hours ago
$121
Roundtrip
found 4 hours ago
Select Spirit Airlines flight, departing Wed, Aug 13 from San Diego Intl. to O'Hare Intl., returning Tue, Aug 19, priced at $121 found 4 hours ago
Wed, Aug 6 - Wed, Aug 20
SAN
San Diego Intl.
ORD
O'Hare Intl.
$130 Roundtrip, found 5 days ago
$130
Roundtrip
found 5 days ago
Select Spirit Airlines flight, departing Wed, Aug 6 from San Diego Intl. to O'Hare Intl., returning Wed, Aug 20, priced at $130 found 5 days ago
Tue, Aug 12 - Tue, Aug 19
SAN
San Diego Intl.
ORD
O'Hare Intl.
$138 Roundtrip, found 6 hours ago
$138
Roundtrip
found 6 hours ago
Select Spirit Airlines flight, departing Tue, Aug 12 from San Diego Intl. to O'Hare Intl., returning Tue, Aug 19, priced at $138 found 6 hours ago
Wed, Oct 29 - Wed, Nov 5
SAN
San Diego Intl.
ORD
O'Hare Intl.
$139 Roundtrip, found 2 hours ago
$139
Roundtrip
found 2 hours ago
Select Alaska Airlines flight, departing Wed, Oct 29 from San Diego Intl. to O'Hare Intl., returning Wed, Nov 5, priced at $139 found 2 hours ago
Tue, Sep 30 - Tue, Oct 7
SAN
San Diego Intl.
ORD
O'Hare Intl.
$139 Roundtrip, found 18 hours ago
$139
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Tue, Sep 30 from San Diego Intl. to O'Hare Intl., returning Tue, Oct 7, priced at $139 found 18 hours ago
Tue, Sep 30 - Tue, Oct 7
SAN
San Diego Intl.
ORD
O'Hare Intl.
$141 Roundtrip, found 18 hours ago
$141
Roundtrip
found 18 hours ago
Select American Airlines flight, departing Tue, Sep 30 from San Diego Intl. to O'Hare Intl., returning Tue, Oct 7, priced at $141 found 18 hours ago
Wed, Sep 3 - Sat, Sep 6
SAN
San Diego Intl.
ORD
O'Hare Intl.
$142 Roundtrip, found 4 days ago
$142
Roundtrip
found 4 days ago
Select United flight, departing Wed, Sep 3 from San Diego Intl. to O'Hare Intl., returning Sat, Sep 6, priced at $142 found 4 days ago
Wed, Nov 12 - Sat, Nov 15
CLD
McClellan-Palomar
ORD
O'Hare Intl.
$159 Roundtrip, found 6 days ago
$159
Roundtrip
found 6 days ago
Select American Airlines flight, departing Wed, Nov 12 from McClellan-Palomar to O'Hare Intl., returning Sat, Nov 15, priced at $159 found 6 days ago
Wed, Sep 3 - Sun, Sep 7
GEG
Spokane Intl.
ORD
O'Hare Intl.
$172 Roundtrip, found 6 days ago
$172
Roundtrip
found 6 days ago
Select Southwest Airlines flight, departing Wed, Sep 3 from Spokane Intl. to O'Hare Intl., returning Sun, Sep 7, priced at $172 found 6 days ago

Northern Illinois Flight Information

Traveling To
Northern Illinois
Destination Airport IATA Code
CHI
Number of Airlines Serving
Airlines
Spirit Airlines, Alaska Airlines, American Airlines, United, Southwest Airlines
Flight Price
$108
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

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Northern Illinois economy flight packages

Price found within the past 48 hours. Click for updated prices.
Super Sleep Inn By OYO I-80 Princeton
2.5-star property

Super Sleep Inn By OYO I-80 Princeton

Sep 2 - Sep 9

7 night stay

New York (NYC) to Chicago (ORD)

Southwest Airlines • Coach

Chicago (ORD) to New York (NYC)

Spirit Airlines • Coach
Save 100% on your flight
per person
found 1 day ago
The French Country Inn Lake Geneva
3.0-star property

The French Country Inn Lake Geneva

Aug 28 - Sep 2

5 night stay

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

Spirit Airlines • Non-stop roundtrip • Coach
Save 100% on your flight
per person
found 13 hours ago
Harrah's Joliet Casino & Hotel
3.5-star property

Harrah's Joliet Casino & Hotel

Sep 19 - Sep 22

3 night stay

Los Angeles (LAX) to Chicago (CHI)

Frontier Airlines • Roundtrip • Coach
Save 100% on your flight
per person
found 4 hours ago
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Northern Illinois premium economy flight packages

Price found within the past 48 hours. Click for updated prices.
Hotel Riu Plaza Chicago
4.0-star property

Hotel Riu Plaza Chicago

9.4/10 Exceptional! (2,122 reviews)

Sep 17 - Sep 20

3 night stay

Dallas (DFW) to Chicago (ORD)

Delta • Non-stop roundtrip • PremiumEconomy
Save 100% on your flight
per person
found 1 day ago
Very convenient to the heart of Chicago! Nice hotel!

Reviewed on Jul 24, 2025

Trump International Hotel & Tower Chicago
5.0-star property

Trump International Hotel & Tower Chicago

9.4/10 Exceptional! (1,635 reviews)

Sep 17 - Sep 20

3 night stay

Dallas (DFW) to Chicago (ORD)

Delta • Non-stop roundtrip • PremiumEconomy
Save 100% on your flight
per person
found 1 day ago
This is the nicest hotel that I have ever stayed at. Everything was perfect!

Reviewed on Jun 16, 2025

Arlo Chicago
4.0-star property

Arlo Chicago

9.2/10 Wonderful! (1,785 reviews)

Sep 17 - Sep 20

3 night stay

Dallas (DFW) to Chicago (ORD)

Delta • Non-stop roundtrip • PremiumEconomy
per person
found 1 day ago
Fantastic stay, amazing location.

Reviewed on Jun 25, 2025

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Northern Illinois first class flight packages

Price found within the past 48 hours. Click for updated prices.
Hotel Riu Plaza Chicago
4.0-star property

Hotel Riu Plaza Chicago

9.4/10 Exceptional! (2,122 reviews)

Sep 7 - Sep 9

2 night stay

New York (NYC) to Chicago (ORD)

American Airlines • Non-stop • FirstClass

Chicago (ORD) to New York (NYC)

Delta • Non-stop • FirstClass
per person
found 1 day ago
Very convenient to the heart of Chicago! Nice hotel!

Reviewed on Jul 24, 2025

Trump International Hotel & Tower Chicago
5.0-star property

Trump International Hotel & Tower Chicago

9.4/10 Exceptional! (1,635 reviews)

Sep 7 - Sep 9

2 night stay

New York (NYC) to Chicago (ORD)

American Airlines • Non-stop • FirstClass

Chicago (ORD) to New York (NYC)

Delta • Non-stop • FirstClass
per person
found 1 day ago
This is the nicest hotel that I have ever stayed at. Everything was perfect!

Reviewed on Jun 16, 2025

Park Hyatt Chicago
5.0-star property

Park Hyatt Chicago

9.6/10 Exceptional! (1,000 reviews)

Sep 7 - Sep 9

2 night stay

New York (NYC) to Chicago (ORD)

American Airlines • Non-stop • FirstClass

Chicago (ORD) to New York (NYC)

Delta • Non-stop • FirstClass
per person
found 1 day ago
From the moment you walk into their lobby at the hotel, you enter a place of calm and relaxation. We stayed in a room with the Water Tower view, and if you have that as the option, take it. It was a beautiful sight to see waking up every morning. This hotel like their other properties are in a class of their own.

Reviewed on Sep 13, 2024

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Northern Illinois

Finding cheap flights to Northern Illinois is easy when you have Orbitz at your fingertips. Not only does Orbitz offer great deals on Northern Illinois flights, but we also include some special extras to make booking a breeze. Just check out our:

Mobile Site and Apps

With Orbitz’s mobile site, m.orbitz.com, you can book your flights to Northern Illinois through your smartphone or tablet’s Web browser. Plus, our free downloadable apps for Android and iPhone mean it’s just a simple click to access your flight updates and alerts. You can even book exclusive mobile-only deals on hotels to go with your flights to Northern Illinois—even on the same day.

Pick and Choose or Book Full Vacation Packages

Don’t just be satisfied with great deals on Northern Illinois flights—go for the full package! With Orbitz, you can also find fantastic savings on the perfect hotel, car rental, cruise, and even activities, so you don’t waste your trip waiting in line but have the time to enjoy your trip. Pick and choose the add-ons you need, or book an entire vacation package for greater overall discounts.

Rewards That Are Miles Better

Booking directly with an airline earns you air miles or points, and you can get those same rewards with booking on Orbitz too. When you book qualifying flights to Northern Illinois with Orbitz, just add in your frequent flyer number during your online booking and your details will be sent to your program.

Great Deals Every Day

Add in our extra savings on packages, free nights, and other discounts, and you know you are in good hands.

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 $108 to $172 this week. Kicking off your journey from San Diego (SAN)? The cheapest one-way prices were just $43.
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.

Nearby

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.