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$80+ Cheap flights from Trenton, NJ (TTN) 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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from Trenton to Illinois

Keep the following information in mind while searching for Trenton to Illinois flight deals. Data was last updated September 11, 2025.

Round-trip from

$143
(CheapOair)

One-way from

$80
(CheapOair)

Popular in

August

Cheapest in

January

Average price

$185
From Trenton-Mercer to Illinois
Search Deals
One-way flight from Trenton-Mercer to Illinois
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Highest demand for flights based on searches. 4% potential increase in price ($10 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Trenton to Illinois

Cheapest flights from Trenton to Illinois
Explore the most affordable flight options available from Trenton to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:30 pmTTN - ORD
1 stop12h 09mFrontier
Mon 10/65:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$143
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2611:45 amTTN - ORD
1 stop8h 59mFrontier
Mon 9/295:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$151
This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/254:57 pmTTN - ORD
1 stop27h 47mFrontier
Mon 9/295:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$152
This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1911:45 amTTN - ORD
1 stop8h 59mFrontier
Mon 9/295:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$153
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/164:25 pmTTN - ORD
1 stop16h 09mFrontier
Sat 10/187:43 pmORD - TTN
1 stop13h 31mFrontier
Deal found 9/10$159
This Gotogate deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/1911:45 amTTN - ORD
1 stop8h 59mFrontier
Mon 9/225:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$160
This Frontier deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/312:30 pmTTN - ORD
1 stop12h 09mFrontier
Sun 10/58:49 pmORD - TTN
1 stop13h 11mFrontier
Deal found 9/11$161
This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/184:57 pmTTN - ORD
1 stop27h 47mFrontier
Sun 9/218:49 pmORD - TTN
1 stop13h 11mFrontier
Deal found 9/10$162
This CheapOair deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/210:30 amTTN - STL
1 stop5h 34mFrontier
Sun 10/54:00 pmSTL - TTN
1 stop18h 34mFrontier
Deal found 9/11$163
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/2612:30 pmTTN - ORD
1 stop23h 57mFrontier
Wed 10/111:45 amORD - TTN
1 stop20h 47mFrontier
Deal found 9/10$163
This Booking.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/184:57 pmTTN - ORD
1 stop27h 47mFrontier
Mon 9/225:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 9/10$167
This CheapOair deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/1810:30 amTTN - STL
1 stop5h 34mFrontier
Thu 9/254:00 pmSTL - TTN
1 stop18h 34mFrontier
Deal found 9/11$188

Cheapflights Fare Finder

 
Customize your flight search to find flights from Trenton to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from Trenton to Illinois that are best for you.

Fly from

Trenton

Fly to

Illinois

Route

Depart

Return

Price

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 10/3

12:30 pm-11:39 pm

1 stop12h 09m

Chicago O'Hare Intl

Mon 10/6

5:10 am-11:34 am

1 stop5h 24m

$143

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/25

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Mon 9/29

5:10 am-11:34 am

1 stop5h 24m

$151

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 9/19

11:45 am-7:44 pm

1 stop8h 59m

Chicago O'Hare Intl

Mon 9/29

5:10 am-11:34 am

1 stop5h 24m

$153

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/16

4:25 pm-7:34 am

1 stop16h 09m

Chicago O'Hare Intl

Sat 10/18

7:43 pm-10:14 am

1 stop13h 31m

$159

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/25

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Sun 9/28

8:49 pm-11:00 am

1 stop13h 11m

$161

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/23

4:25 pm-7:34 am

1 stop16h 09m

Chicago O'Hare Intl

Thu 10/30

7:05 am-10:13 am

1 stop26h 08m

$161

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 9/26

11:45 am-7:44 pm

1 stop8h 59m

Chicago O'Hare Intl

Sun 9/28

8:49 pm-11:00 am

1 stop13h 11m

$161

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 10/3

12:30 pm-11:39 pm

1 stop12h 09m

Chicago O'Hare Intl

Sun 10/5

8:49 pm-11:00 am

1 stop13h 11m

$161

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/9

4:25 pm-7:34 am

1 stop16h 09m

Chicago O'Hare Intl

Sat 10/18

7:43 pm-10:14 am

1 stop13h 31m

$161

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/18

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Sun 9/21

8:49 pm-11:00 am

1 stop13h 11m

$162

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 44 results
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Best time to book a flight from Trenton to Illinois

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

Cheapflights Insights

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

What is the cheapest month to book a flight from Trenton, New Jersey to Illinois?

Currently, August is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $245). Flying from Trenton, New Jersey 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.

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

Find hourly flight availability from Trenton to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

When flying from Trenton, New Jersey 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.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Frontier from Trenton to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.8
Fair
3,177 reviews

Entertainment

4.4

Food

4.7

Overall

5.8

Comfort

5.5

Boarding

6.1

Crew

6.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.
Frontier
5.8
Fair
3,177 reviews
Frontier
5.8
Fair
3,177 reviews

Entertainment

4.4

Food

4.7

Overall

5.8

Comfort

5.5

Boarding

6.1

Crew

6.7

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

MCO - DFW

Frontier likes to promote themselves as being a cheap airline to fly, but in the end, that’s laughable. Only AFTER I booked through you, and then had to go to their site to choose my seats and baggage, did I find they charged a $75 “Passenger” fee. No explanation on what that was even for. Then for them to charge $5 for sodas, and who knows what for any small snack, is just insulting.

Related info for your journey

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

  • What airport do you fly from for flights from Trenton to Illinois?

    For a flight from Trenton to Illinois, you will be flying from Trenton-Mercer. Trenton-Mercer (TTN) is just 4.8 mi from the center of the city.

  • How long is the flight from Trenton, New Jersey to Illinois?

    Airlines like Frontier fly from Trenton, New Jersey to Illinois in about 12h 09m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 690 mi.

  • What are the most popular routes from Trenton, New Jersey to Illinois?

    Most travelers choose Trenton-Mercer - Chicago O'Hare Intl, Trenton-Mercer - Lambert-St Louis or Trenton-Mercer - Chicago Greater Rockford when deciding on the best route from Trenton, New Jersey to Illinois.

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

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

  • How can I find direct flights from Trenton to Illinois?

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

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

    Yes. Cheapflights offers flight deals from Trenton 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 Trenton, New Jersey to Illinois?

    Currently, August is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $245). Flying from Trenton, New Jersey 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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