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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 1/21. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Dec 13 — Dec 201
Sat 12/13
Sat 12/20
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 13, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$110
(CheapOair)

One-way from

$55
(CheapOair)

Popular in

August

Cheapest in

January

Average price

$234
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. 7% 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 13, 2025.

This Booking.com deal was found by Cheapflights users on 11/10. 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.
Mon 12/86:10 amTTN - STL
1 stop17h 23mFrontier
Fri 12/123:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/10$125
This Frontier deal was found by Cheapflights users on 11/11. 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.
Thu 11/2712:44 pmTTN - STL
1 stop12h 13mFrontier
Thu 12/43:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/11$127
This Frontier deal was found by Cheapflights users on 11/12. 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 12/79:08 pmTTN - STL
1 stop12h 51mFrontier
Fri 12/123:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/12$138
This Kiwi.com deal was found by Cheapflights users on 11/11. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/226:44 pmTTN - ORD
1 stop16h 29mFrontier
Mon 11/246:15 pmORD - TTN
1 stop16h 34mFrontier
Deal found 11/11$144
This CheapOair deal was found by Cheapflights users on 11/12. 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 CheapOair 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 11/12$170
This Super.com deal was found by Cheapflights users on 11/13. 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 Super.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
Mon 12/152:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/13$174
This Booking.com deal was found by Cheapflights users on 11/11. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/156:10 amTTN - STL
1 stop17h 23mFrontier
Wed 12/173:30 pmSTL - TTN
1 stop28h 44mFrontier
Deal found 11/11$182
This Frontier deal was found by Cheapflights users on 11/12. 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 12/79:08 pmTTN - STL
1 stop12h 51mFrontier
Thu 12/113:30 pmSTL - TTN
1 stop7h 29mFrontier
Deal found 11/12$194
This CheapOair deal was found by Cheapflights users on 11/11. 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 12/45:58 pmTTN - ORD
1 stop20h 18mFrontier
Mon 12/82:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/11$200
This Mytrip deal was found by Cheapflights users on 11/12. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 12/66:10 amTTN - STL
1 stop17h 23mFrontier
Wed 12/103:30 pmSTL - TTN
1 stop24h 33mFrontier
Deal found 11/12$213
This Booking.com deal was found by Cheapflights users on 11/12. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/116:10 amTTN - STL
1 stop17h 23mFrontier
Fri 12/129:54 amSTL - TTN
1 stop13h 05mFrontier
Deal found 11/12$220
This Frontier deal was found by Cheapflights users on 11/13. 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 12/86:10 amTTN - ORD
1 stop8h 06mFrontier
Mon 12/152:26 pmORD - TTN
1 stop8h 33mFrontier
Deal found 11/13$220

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 13, 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

Mon 12/8

6:10 am-10:33 pm

1 stop17h 23m

Lambert-St Louis

Fri 12/12

3:30 pm-11:59 pm

1 stop7h 29m

$125

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 12/11

6:10 am-8:59 am

1 stop27h 49m

Lambert-St Louis

Fri 12/12

3:30 pm-11:59 pm

1 stop7h 29m

$125

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 1/10

7:35 pm-3:28 pm

1 stop20h 53m

Chicago O'Hare Intl

Thu 1/29

11:51 am-7:48 pm

1 stop6h 57m

$130

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 1/11

6:00 am-7:50 am

1 stop26h 50m

Lambert-St Louis

Tue 1/13

5:11 pm-9:44 pm

1 stop27h 33m

$136

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 12/7

9:08 pm-8:59 am

1 stop12h 51m

Lambert-St Louis

Fri 12/12

3:30 pm-11:59 pm

1 stop7h 29m

$138

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 1/15

9:59 pm-7:54 am

1 stop10h 55m

Lambert-St Louis

Sun 1/18

5:06 pm-12:01 am

1 stop5h 55m

$146

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 2/26

6:10 am-2:19 pm

1 stop9h 09m

Chicago O'Hare Intl

Tue 3/3

9:00 am-10:02 pm

1 stop12h 02m

$150

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 12/15

6:10 am-10:33 pm

1 stop17h 23m

Lambert-St Louis

Wed 12/17

3:30 pm-9:14 pm

1 stop28h 44m

$182

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 12/7

9:08 pm-8:59 am

1 stop12h 51m

Lambert-St Louis

Thu 12/11

3:30 pm-11:59 pm

1 stop7h 29m

$194

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 12/6

6:10 am-1:16 pm

1 stop8h 06m

Chicago O'Hare Intl

Sat 12/13

2:26 pm-11:59 pm

1 stop8h 33m

$198

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/13

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, 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 13, 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 17h 23m. 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, 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.

See more FAQs

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