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$64+ 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 3/4. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Jan 14 — Jan 211
Wed 1/14
Wed 1/21
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 December 15, 2025.

This Frontier deal was found by Cheapflights users on 12/13. 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.
Sun 12/219:59 pmTTN - STL
1 stop12h 46mFrontier
Mon 1/510:40 amSTL - TTN
1 stop12h 19mFrontier
Deal found 12/13$187
This Frontier deal was found by Cheapflights users on 12/13. 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.
Sun 12/219:59 pmTTN - STL
1 stop12h 46mFrontier
Thu 1/14:27 pmSTL - TTN
1 stop6h 32mFrontier
Deal found 12/13$212
This Frontier deal was found by Cheapflights users on 12/14. 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.
Sun 12/219:59 pmTTN - ORD
1 stop11h 48mFrontier
Thu 1/111:28 amORD - TTN
1 stop8h 46mFrontier
Deal found 12/14$212
This Frontier deal was found by Cheapflights users on 12/13. 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 12/299:21 pmTTN - ORD
1 stop12h 41mFrontier
Mon 1/59:47 amORD - TTN
1 stop13h 12mFrontier
Deal found 12/13$213
This Super.com deal was found by Cheapflights users on 12/15. 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.
Sat 12/209:59 pmTTN - ORD
1 stop22h 22mFrontier
Wed 1/75:29 pmORD - TTN
1 stop19h 03mFrontier
Deal found 12/15$224
This Frontier deal was found by Cheapflights users on 12/12. 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.
Sun 12/219:59 pmTTN - ORD
1 stop11h 48mFrontier
Wed 12/3111:23 amORD - TTN
1 stop11h 36mFrontier
Deal found 12/12$232
This Frontier deal was found by Cheapflights users on 12/14. 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 12/209:59 pmTTN - ORD
1 stop12h 03mFrontier
Thu 1/111:28 amORD - TTN
1 stop8h 46mFrontier
Deal found 12/14$238
This CheapOair deal was found by Cheapflights users on 12/13. 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 12/299:21 pmTTN - ORD
1 stop21h 30mFrontier
Sun 1/48:09 pmORD - TTN
1 stop26h 50mFrontier
Deal found 12/13$249
This Frontier deal was found by Cheapflights users on 12/14. 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 12/299:21 pmTTN - ORD
1 stop12h 41mFrontier
Wed 12/3111:23 amORD - TTN
1 stop11h 36mFrontier
Deal found 12/14$258
This Frontier deal was found by Cheapflights users on 12/14. 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.
Sun 12/219:59 pmTTN - ORD
1 stop11h 48mFrontier
Tue 12/3010:12 amORD - TTN
1 stop10h 02mFrontier
Deal found 12/14$267
This CheapOair deal was found by Cheapflights users on 12/13. 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 12/209:59 pmTTN - ORD
1 stop22h 22mFrontier
Tue 12/3010:12 amORD - TTN
1 stop12h 47mFrontier
Deal found 12/13$268
This Frontier deal was found by Cheapflights users on 12/13. 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.
Sun 12/219:59 pmTTN - STL
1 stop12h 46mFrontier
Fri 1/29:07 amSTL - TTN
1 stop8h 09mFrontier
Deal found 12/13$287

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 December 15, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$146
(CheapOair)

One-way from

$64
(Frontier)

Popular in

August

Cheapest in

January

Average price

$272
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 ($22 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 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 December 15, 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

Thu 2/5

8:38 pm-10:35 am

1 stop14h 57m

Chicago O'Hare Intl

Sat 2/7

9:15 am-11:26 am

1 stop25h 11m

$146

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 1/15

6:15 am-7:08 pm

1 stop13h 53m

Chicago O'Hare Intl

Thu 1/22

11:51 am-7:48 pm

1 stop6h 57m

$162

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Wed 2/4

3:21 pm-10:41 am

1 stop20h 20m

Chicago O'Hare Intl

Sat 2/7

9:15 am-11:26 am

1 stop25h 11m

$167

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 1/21

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Fri 1/23

11:18 am-6:38 pm

1 stop6h 20m

$180

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 1/22

12:04 pm-11:33 pm

1 stop12h 29m

Lambert-St Louis

Fri 1/23

11:18 am-6:38 pm

1 stop6h 20m

$197

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 1/20

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Fri 1/23

11:18 am-6:38 pm

1 stop6h 20m

$197

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 1/27

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Fri 1/30

11:18 am-6:38 pm

1 stop6h 20m

$197

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 2/19

6:45 am-12:54 pm

1 stop7h 09m

Chicago O'Hare Intl

Sun 2/22

1:17 pm-7:47 am

1 stop17h 30m

$198

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Wed 1/21

3:21 pm-10:41 am

1 stop20h 20m

Chicago O'Hare Intl

Thu 1/22

3:55 pm-11:01 am

1 stop18h 06m

$207

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 1/23

11:56 am-4:35 pm

1 stop29h 39m

Chicago O'Hare Intl

Mon 1/26

11:51 am-2:26 pm

1 stop25h 35m

$208

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/13

Showing 1-10 of 38 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, May is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $55). 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 December 15, 2025.

It’s typically best to fly out from Trenton, New Jersey to Illinois in the morning. Doing so could potentially save you 51% 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 14h 57m. 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, May is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $55). 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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