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$55+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Dec 17 — Dec 241
Wed 12/17
Wed 12/24
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 November 17, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$117
(Mytrip)

One-way from

$55
(Mytrip)

Popular in

August

Cheapest in

January

Average price

$235
Provider with most accurate pricing for New York (NYC)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Chicago (CHI) flights.
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From Trenton-Mercer to Illinois
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One-way flight from Trenton-Mercer to Illinois
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Highest demand for flights based on searches. 8% potential increase in price ($20 potential increase over avg. RT price).
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Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
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Average for round-trip flights in November 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 November 17, 2025.

This Booking.com deal was found by Cheapflights users on 11/17. 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 12/115:58 pmTTN - ORD
1 stop20h 18mFrontier
Sat 12/132:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/17$177
This Mytrip deal was found by Cheapflights users on 11/16. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:10 amTTN - STL
1 stop27h 49mFrontier
Mon 12/153:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/16$180
This Gotogate deal was found by Cheapflights users on 11/16. 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 12/125:58 pmTTN - STL
1 stop29h 35mFrontier
Mon 12/159:54 amSTL - TTN
1 stop13h 05mFrontier
Deal found 11/16$194
This Frontier deal was found by Cheapflights users on 11/17. 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.
Mon 12/86:10 amTTN - ORD
1 stop8h 06mFrontier
Sat 12/132:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/17$200
This Booking.com deal was found by Cheapflights users on 11/17. 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 12/45:58 pmTTN - ORD
1 stop20h 18mFrontier
Sat 12/62:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/17$202
This Booking.com deal was found by Cheapflights users on 11/16. 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 12/55:58 pmTTN - STL
1 stop29h 35mFrontier
Sun 12/73:30 pmSTL - TTN
1 stop24h 33mFrontier
Deal found 11/16$211
This Frontier deal was found by Cheapflights users on 11/17. 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.
Sat 12/66:10 amTTN - ORD
1 stop8h 06mFrontier
Sat 12/132:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/17$220
This Frontier deal was found by Cheapflights users on 11/16. 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.
Thu 11/2712:44 pmTTN - STL
1 stop12h 13mFrontier
Thu 12/43:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/16$221
This Booking.com deal was found by Cheapflights users on 11/16. 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 11/284:18 pmTTN - STL
1 stop8h 39mFrontier
Thu 12/43:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/16$223
This Kiwi.com deal was found by Cheapflights users on 11/17. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:10 amTTN - ORD
1 stop9h 11mMultiple Airlines
Sat 12/136:11 amORD - TTN
2 stops16h 48mMultiple Airlines
Deal found 11/17$231
This Super.com deal was found by Cheapflights users on 11/16. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:10 amTTN - ORD
1 stop8h 06mFrontier
Mon 12/152:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/16$248
This Booking.com deal was found by Cheapflights users on 11/16. 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 12/45:58 pmTTN - ORD
1 stop20h 18mFrontier
Mon 12/82:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/16$253

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 November 17, 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

Sat 1/10

8:00 am-7:17 pm

1 stop12h 17m

Chicago O'Hare Intl

Sat 1/10

8:27 pm-1:32 pm

1 stop16h 05m

$123

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 1/24

8:19 pm-11:11 am

1 stop15h 52m

Chicago O'Hare Intl

Sat 1/31

9:15 am-11:26 am

1 stop25h 11m

$130

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 2/19

6:00 am-12:51 pm

1 stop7h 51m

Chicago O'Hare Intl

Mon 2/23

7:00 am-9:04 pm

1 stop13h 04m

$130

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 1/11

7:58 pm-7:21 pm

1 stop24h 23m

Lambert-St Louis

Tue 1/13

5:11 pm-9:44 pm

1 stop27h 33m

$137

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 12/11

5:58 pm-1:16 pm

1 stop20h 18m

Chicago O'Hare Intl

Sat 12/13

2:26 pm-11:59 pm

1 stop8h 33m

$177

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 12/11

6:10 am-8:59 am

1 stop27h 49m

Lambert-St Louis

Mon 12/15

3:30 pm-11:59 pm

1 stop7h 29m

$180

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 12/12

5:58 pm-10:33 pm

1 stop29h 35m

Lambert-St Louis

Mon 12/15

9:54 am-11:59 pm

1 stop13h 05m

$194

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 12/4

5:58 pm-1:16 pm

1 stop20h 18m

Chicago O'Hare Intl

Sat 12/6

2:26 pm-11:59 pm

1 stop8h 33m

$210

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 12/5

5:58 pm-10:33 pm

1 stop29h 35m

Lambert-St Louis

Sun 12/7

3:30 pm-5:03 pm

1 stop24h 33m

$211

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 11/27

12:44 pm-11:57 pm

1 stop12h 13m

Lambert-St Louis

Thu 12/4

3:30 pm-11:59 pm

1 stop7h 29m

$221

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/17

Showing 1-10 of 45 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, November is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $54). Flying from Trenton, New Jersey to Illinois in July is currently the most expensive (average of $126). 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 November 17, 2025.

It’s typically best to fly out from Trenton, New Jersey to Illinois in the morning. Doing so could potentially save you 54% on the flight price compared to flying in the evening, which is usually more expensive.

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 17m. 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, November is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $54). Flying from Trenton, New Jersey to Illinois in July is currently the most expensive (average of $126). 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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