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$54+ 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 10/30. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Nov 12 — Nov 191
Wed 11/12
Wed 11/19
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 October 13, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$108
(CheapOair)

One-way from

$54
(Frontier)

Popular in

August

Cheapest in

January

Average price

$238
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 ($19 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 October 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 October 13, 2025.

This Frontier deal was found by Cheapflights users on 10/12. 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.
Thu 10/306:00 amTTN - ORD
1 stop7h 26mFrontier
Mon 11/35:15 amORD - TTN
1 stop11h 20mFrontier
Deal found 10/12$108
This CheapOair deal was found by Cheapflights users on 10/11. 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.
Sat 10/258:00 amTTN - ORD
1 stop11h 33mFrontier
Sun 10/265:50 amORD - TTN
1 stop26h 34mFrontier
Deal found 10/11$135
This Booking.com deal was found by Cheapflights users on 10/11. 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.
Thu 10/236:00 amTTN - ORD
1 stop26h 34mFrontier
Mon 10/278:15 amORD - TTN
1 stop14h 44mFrontier
Deal found 10/11$156
This CheapOair deal was found by Cheapflights users on 10/10. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/188:00 amTTN - ORD
1 stop8h 39mFrontier
Sat 10/257:43 pmORD - TTN
1 stop13h 31mFrontier
Deal found 10/10$173
This Frontier deal was found by Cheapflights users on 10/10. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/306:00 amTTN - ORD
1 stop7h 26mFrontier
Sun 11/27:05 amORD - TTN
1 stop12h 29mFrontier
Deal found 10/10$181
This Booking.com deal was found by Cheapflights users on 10/12. 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 10/236:00 amTTN - ORD
1 stop26h 34mFrontier
Sun 10/265:50 amORD - TTN
1 stop26h 34mFrontier
Deal found 10/12$183
This CheapOair deal was found by Cheapflights users on 10/11. 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.
Fri 10/316:00 amTTN - ORD
1 stop7h 26mFrontier
Mon 11/35:15 amORD - TTN
1 stop11h 20mFrontier
Deal found 10/11$191
This Booking.com deal was found by Cheapflights users on 10/11. 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 10/276:00 amTTN - ORD
1 stop12h 13mFrontier
Mon 11/35:15 amORD - TTN
1 stop11h 20mFrontier
Deal found 10/11$193
This Mytrip deal was found by Cheapflights users on 10/11. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:00 amTTN - ORD
1 stop26h 34mFrontier
Thu 10/307:05 amORD - TTN
1 stop26h 08mFrontier
Deal found 10/11$200
This Booking.com deal was found by Cheapflights users on 10/12. 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.
Fri 11/146:00 amTTN - ORD
1 stop7h 26mFrontier
Sun 11/167:05 amORD - TTN
1 stop26h 08mFrontier
Deal found 10/12$202
This CheapOair deal was found by Cheapflights users on 10/12. 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.
Sun 10/264:25 pmTTN - ORD
1 stop25h 48mFrontier
Sun 11/27:05 amORD - TTN
1 stop12h 29mFrontier
Deal found 10/12$218
This CheapOair deal was found by Cheapflights users on 10/11. 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.
Sat 10/188:00 amTTN - ORD
1 stop8h 39mFrontier
Sun 10/195:50 amORD - TTN
1 stop26h 34mFrontier
Deal found 10/11$219

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 October 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

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/30

6:00 am-12:26 pm

1 stop7h 26m

Chicago O'Hare Intl

Mon 11/3

5:15 am-11:59 pm

1 stop17h 44m

$108

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/30

6:00 am-12:26 pm

1 stop7h 26m

Chicago O'Hare Intl

Sun 11/2

7:05 am-8:34 pm

1 stop12h 29m

$135

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 10/25

8:00 am-6:33 pm

1 stop11h 33m

Chicago O'Hare Intl

Sun 10/26

5:50 am-9:24 am

1 stop26h 34m

$135

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/30

6:00 am-12:26 pm

1 stop7h 26m

Chicago O'Hare Intl

Sat 11/1

8:00 am-11:59 pm

1 stop14h 59m

$156

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/23

4:25 pm-7:34 am

1 stop16h 09m

Chicago O'Hare Intl

Sat 10/25

7:43 pm-10:14 am

1 stop13h 31m

$156

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/23

6:00 am-7:34 am

1 stop26h 34m

Chicago O'Hare Intl

Mon 10/27

8:15 am-11:59 pm

1 stop14h 44m

$156

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 10/23

6:00 am-7:34 am

1 stop26h 34m

Chicago O'Hare Intl

Sun 10/26

5:50 am-9:24 am

1 stop26h 34m

$183

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 11/14

6:00 am-4:20 pm

1 stop11h 20m

Lambert-St Louis

Sun 11/16

2:12 pm-11:59 pm

1 stop8h 47m

$228

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/23

6:00 am-12:46 pm

1 stop7h 46m

Lambert-St Louis

Sat 10/25

4:33 pm-11:59 pm

1 stop6h 26m

$237

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 11/10

6:00 am-1:17 pm

1 stop8h 17m

Lambert-St Louis

Fri 11/14

5:05 pm-11:59 pm

1 stop5h 54m

$256

Flights are sorted by cheapest round-trip flights first.

Deals found on 10/12

Showing 1-10 of 34 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 $44). 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 October 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.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated October 13, 2025.
Get a feel of what it's like to fly with Frontier from Trenton to Illinois by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Frontier
5.8
Fair
3,137 reviews

Crew

6.7

Boarding

6.1

Comfort

5.5

Overall

5.8

Food

4.6

Entertainment

4.4

Reviews

1 / 20
2.0
Mediocre

Shawn,Sep 2025

SAN - SFO

The flight was over booked and was unadble to get help with issue. I could not get a refund or rebooked in order to make my trip
Frontier
5.8
Fair
3,137 reviews
Frontier
5.8
Fair
3,137 reviews

Crew

6.7

Boarding

6.1

Comfort

5.5

Overall

5.8

Food

4.6

Entertainment

4.4

Reviews

1 / 20
2.0
Mediocre

Shawn,Sep 2025

SAN - SFO

The flight was over booked and was unadble to get help with issue. I could not get a refund or rebooked in order to make my trip

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 7h 26m. 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 $44). 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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