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$71+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
ene. 29 — feb. 51
jue. 1/29
jue. 2/5
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 diciembre 30, 2025.

This Frontier deal was found by Cheapflights users on 12/27. 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.
mié. 12/319:59 pmTTN - ORD
1 stop13h 19mFrontier
sáb. 1/310:12 amORD - TTN
1 stop12h 47mFrontier
Deal found 12/27$1,000
This Frontier deal was found by Cheapflights users on 12/28. 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.
mar. 12/309:59 pmTTN - ORD
1 stop13h 19mFrontier
dom. 1/410:12 amORD - TTN
1 stop12h 47mFrontier
Deal found 12/28$1,070
This Gotogate deal was found by Cheapflights users on 12/28. 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.
mar. 12/309:59 pmTTN - STL
1 stop25h 34mFrontier
dom. 1/44:27 pmSTL - TTN
1 stop6h 32mFrontier
Deal found 12/28$1,076
This Frontier deal was found by Cheapflights users on 12/29. 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.
mar. 12/309:59 pmTTN - ORD
1 stop13h 19mFrontier
jue. 1/111:28 amORD - TTN
1 stop11h 31mFrontier
Deal found 12/29$1,100
This Gotogate deal was found by Cheapflights users on 12/29. 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.
mié. 12/319:59 pmTTN - STL
1 stop25h 34mFrontier
sáb. 1/34:27 pmSTL - TTN
1 stop27h 47mFrontier
Deal found 12/29$1,120
This Frontier deal was found by Cheapflights users on 12/28. 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.
mar. 12/309:59 pmTTN - ORD
1 stop13h 19mFrontier
vie. 1/210:12 amORD - TTN
1 stop12h 47mFrontier
Deal found 12/28$1,120
This Gotogate deal was found by Cheapflights users on 12/29. 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.
mar. 12/309:59 pmTTN - STL
1 stop25h 34mFrontier
vie. 1/24:27 pmSTL - TTN
1 stop6h 32mFrontier
Deal found 12/29$1,126

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 diciembre 30, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$200
(Frontier)

One-way from

$71
(Trip.com)

Popular in

August

Cheapest in

January

Average price

$279
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
Search Deals
One-way flight from Trenton-Mercer to Illinois
Search Deals
Highest demand for flights based on searches. 8% potential increase in price ($21 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 December 2025
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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 diciembre 30, 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

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

sáb. 3/7

3:04 pm-11:19 pm

1 stop9h 15m

Lambert-St Louis

lun. 3/9

4:51 pm-11:59 pm

1 stop6h 08m

$200

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

mié. 1/21

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

vie. 1/23

11:18 am-6:38 pm

1 stop6h 20m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

vie. 2/27

1:52 pm-10:47 pm

1 stop9h 55m

Chicago O'Hare Intl

lun. 3/9

4:18 pm-11:59 pm

1 stop6h 41m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

dom. 2/1

12:21 pm-11:59 pm

1 stop12h 38m

Chicago O'Hare Intl

dom. 2/22

2:13 pm-11:59 pm

1 stop8h 46m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

mié. 2/25

8:00 am-3:52 pm

1 stop8h 52m

Chicago O'Hare Intl

lun. 3/9

4:18 pm-11:59 pm

1 stop6h 41m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

lun. 2/23

11:54 am-11:15 pm

1 stop12h 21m

Chicago O'Hare Intl

jue. 2/26

12:15 pm-11:59 pm

1 stop10h 44m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

mié. 2/25

8:00 am-3:52 pm

1 stop8h 52m

Chicago O'Hare Intl

jue. 3/5

12:15 pm-11:59 pm

1 stop10h 44m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

jue. 1/22

12:04 pm-10:35 am

1 stop23h 31m

Chicago O'Hare Intl

sáb. 1/24

9:25 am-8:36 am

1 stop22h 11m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

vie. 2/27

1:52 pm-10:47 pm

1 stop9h 55m

Chicago O'Hare Intl

mar. 3/10

4:18 pm-11:59 pm

1 stop6h 41m

$200

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

lun. 3/2

11:54 am-11:15 pm

1 stop12h 21m

Chicago O'Hare Intl

mar. 3/10

4:18 pm-11:59 pm

1 stop6h 41m

$200

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 42 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 $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.

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 and Allegiant Air fly from Trenton, New Jersey to Illinois in about 9h 15m. The time it takes to get you to your destination can typically vary by up to 13h 25m. Airlines will cover a distance of 834 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $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.

See more FAQs

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