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$79+ 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 5/11. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Mar 21 — Mar 281
Sat 3/21
Sat 3/28
1 adult, Economy
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Cheap 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 February 19, 2026.

This Frontier deal was found by Cheapflights users on 2/17. 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.
Fri 5/155:37 pm
TTN
-
STL
1 stop6h 42m
Frontier
Mon 5/184:55 pm
STL
-
TTN
1 stop6h 04m
Frontier
Deal found 2/17$160
This CheapOair deal was found by Cheapflights users on 2/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:00 am
TTN
-
ORD
1 stop18h 36m
Frontier
Mon 4/206:57 am
ORD
-
TTN
1 stop16h 02m
Frontier
Deal found 2/16$160
This Super.com deal was found by Cheapflights users on 2/19. 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.
Fri 4/173:52 pm
TTN
-
ORD
1 stop9h 06m
Frontier
Sun 4/194:57 pm
ORD
-
TTN
1 stop22h 53m
Frontier
Deal found 2/19$166
This Booking.com deal was found by Cheapflights users on 2/17. 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.
Fri 4/175:37 pm
TTN
-
STL
1 stop6h 42m
Frontier
Sun 4/194:55 pm
STL
-
TTN
1 stop22h 57m
Frontier
Deal found 2/17$167
This CheapOair deal was found by Cheapflights users on 2/17. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/166:00 am
TTN
-
STL
1 stop18h 19m
Frontier
Mon 5/184:55 pm
STL
-
TTN
1 stop6h 04m
Frontier
Deal found 2/17$171
This Super.com deal was found by Cheapflights users on 2/16. 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 3/211:54 am
TTN
-
ORD
1 stop12h 21m
Frontier
Wed 3/48:30 am
ORD
-
TTN
1 stop14h 09m
Frontier
Deal found 2/16$171
This Booking.com deal was found by Cheapflights users on 2/18. 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 4/173:52 pm
TTN
-
ORD
1 stop9h 06m
Frontier
Mon 4/206:00 am
ORD
-
TTN
1 stop9h 50m
Frontier
Deal found 2/18$183
This Super.com deal was found by Cheapflights users on 2/16. 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 3/96:58 pm
TTN
-
ORD
1 stop29h 40m
Frontier
Wed 3/114:18 pm
ORD
-
TTN
1 stop6h 41m
Frontier
Deal found 2/16$185
This Super.com deal was found by Cheapflights users on 2/17. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/248:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Tue 3/38:30 am
ORD
-
TTN
1 stop14h 09m
Frontier
Deal found 2/17$187
This Kiwi.com deal was found by Cheapflights users on 2/18. 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 4/237:15 pm
TTN
-
ORD
1 stop29h 39m
Multiple Airlines
Sun 4/267:06 am
ORD
-
TTN
1 stop10h 19m
Multiple Airlines
Deal found 2/18$188
This Super.com deal was found by Cheapflights users on 2/16. 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 3/233:52 pm
TTN
-
ORD
1 stop8h 52m
Frontier
Tue 3/244:18 pm
ORD
-
TTN
1 stop6h 41m
Frontier
Deal found 2/16$189
This Kiwi.com deal was found by Cheapflights users on 2/16. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/81:26 pm
TTN
-
ORD
1 stop7h 37m
Multiple Airlines
Mon 4/134:21 pm
ORD
-
TTN
1 stop28h 16m
Multiple Airlines
Deal found 2/16$191

Find flight deals from Trenton to Illinois

Keep the following information in mind while searching for Trenton to Illinois flight deals. Data was last updated February 19, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$160
(Frontier)

One-way from

$79
(Super.com)

Popular in

June

Cheapest in

January

Average price

$215
Provider with most accurate pricing for New York (NYC)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Chicago (CHI) flights.
Search Deals
From Trenton-Mercer to Illinois
Search Deals
One-way flight from Trenton-Mercer to Illinois
Search Deals
Highest demand for flights based on searches. 10% potential increase in price ($28 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 19, 2026.
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

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 5/15

5:37 pm-11:19 pm

1 stop6h 42m

Lambert-St Louis

Mon 5/18

4:55 pm-11:59 pm

1 stop6h 04m

$160

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 4/13

6:00 am-11:36 pm

1 stop18h 36m

Chicago O'Hare Intl

Mon 4/20

6:57 am-11:59 pm

1 stop16h 02m

$160

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 4/17

5:37 pm-11:19 pm

1 stop6h 42m

Lambert-St Louis

Sun 4/19

4:55 pm-4:52 pm

1 stop22h 57m

$167

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 5/16

6:00 am-11:19 pm

1 stop18h 19m

Lambert-St Louis

Mon 5/18

4:55 pm-11:59 pm

1 stop6h 04m

$171

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 4/17

3:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Sun 4/19

10:25 am-11:59 pm

1 stop12h 34m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 4/25

6:00 am-9:15 am

1 stop28h 15m

Chicago O'Hare Intl

Sun 4/26

8:24 pm-3:06 pm

1 stop17h 42m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 2/27

1:52 pm-10:47 pm

1 stop9h 55m

Chicago O'Hare Intl

Mon 3/2

3:50 pm-11:39 pm

1 stop6h 49m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 5/15

3:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Mon 5/18

6:57 am-11:59 pm

1 stop16h 02m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Wed 3/4

8:00 am-3:52 pm

1 stop8h 52m

Chicago O'Hare Intl

Tue 3/10

4:18 pm-11:59 pm

1 stop6h 41m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 4/17

3:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Mon 4/20

6:00 am-4:50 pm

1 stop9h 50m

$183

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/16

Showing 1-10 of 46 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, December is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $48). Flying from Trenton, New Jersey to Illinois in July is currently the most expensive (average of $119). 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.

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 6h 42m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 834 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, December is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $48). Flying from Trenton, New Jersey to Illinois in July is currently the most expensive (average of $119). 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.

See more FAQs

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