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$75+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Aug 23 — Aug 301
Sat 8/23
Sat 8/30
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 August 18, 2025.

Round-trip from

$151
(Mytrip)

One-way from

$75
(Cheapflightsfares)

Popular in

June

Cheapest in

September

Average price

$269
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. 11% potential increase in price ($32 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 August 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 August 18, 2025.

This Mytrip deal was found by Cheapflights users on 8/17. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/114:57 pmTTN - ORD
1 stop27h 47mFrontier
Mon 9/155:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/17$151
This Gotogate deal was found by Cheapflights users on 8/18. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/44:57 pmTTN - ORD
1 stop27h 47mFrontier
Mon 9/85:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/18$152
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Fri 9/511:45 amTTN - ORD
1 stop8h 59mFrontier
Sun 9/78:49 pmORD - TTN
1 stop13h 11mFrontier
Deal found 8/17$159
This Booking.com deal was found by Cheapflights users on 8/17. 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.
Thu 10/166:00 amTTN - ORD
1 stop26h 34mFrontier
Sat 10/187:43 pmORD - TTN
1 stop13h 31mFrontier
Deal found 8/17$161
This FlightHub deal was found by Cheapflights users on 8/17. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:30 amTTN - ORD
1 stop14h 40mFrontier
Mon 9/295:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/17$165
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Fri 9/1912:30 pmTTN - ORD
1 stop12h 40mFrontier
Sun 9/218:49 pmORD - TTN
1 stop13h 11mFrontier
Deal found 8/17$171
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Thu 10/210:30 amTTN - ORD
1 stop25h 01mFrontier
Thu 10/307:05 amORD - TTN
1 stop26h 08mFrontier
Deal found 8/17$172
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Mon 9/1511:45 amTTN - ORD
1 stop8h 59mFrontier
Mon 9/225:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/17$177
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Thu 9/184:57 pmTTN - ORD
1 stop27h 47mFrontier
Mon 9/225:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/17$183
This Booking.com deal was found by Cheapflights users on 8/17. 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.
Thu 9/184:57 pmTTN - ORD
1 stop27h 47mFrontier
Fri 9/265:10 amORD - TTN
1 stop5h 24mFrontier
Deal found 8/17$184
This CheapOair deal was found by Cheapflights users on 8/17. 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.
Mon 9/1511:45 amTTN - ORD
1 stop8h 59mFrontier
Sun 9/218:49 pmORD - TTN
1 stop13h 11mFrontier
Deal found 8/17$185
This Frontier deal was found by Cheapflights users on 8/17. 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.
Thu 9/1110:30 amTTN - STL
1 stop5h 34mFrontier
Sat 9/137:55 pmSTL - TTN
2 stops12h 37mFrontier
Deal found 8/17$190

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 August 18, 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

Mon 9/8

11:45 am-7:44 pm

1 stop8h 59m

Chicago O'Hare Intl

Fri 9/12

5:10 am-11:34 am

1 stop5h 24m

$151

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 10/3

11:45 am-7:44 pm

1 stop8h 59m

Chicago O'Hare Intl

Mon 10/6

5:10 am-11:34 am

1 stop5h 24m

$151

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/11

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Mon 9/15

5:10 am-11:34 am

1 stop5h 24m

$151

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 9/12

11:45 am-7:44 pm

1 stop8h 59m

Chicago O'Hare Intl

Mon 9/15

5:10 am-11:34 am

1 stop5h 24m

$151

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/4

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Mon 9/8

5:10 am-11:34 am

1 stop5h 24m

$152

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Thu 9/4

4:57 pm-7:44 pm

1 stop27h 47m

Chicago O'Hare Intl

Sun 9/7

8:49 pm-11:00 am

1 stop13h 11m

$159

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 9/11

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

Sat 9/13

7:55 pm-9:32 am

2 stops12h 37m

$190

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 9/11

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

Sun 9/14

10:39 am-11:34 am

2 stops23h 55m

$196

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 10/12

6:00 am-5:10 pm

1 stop12h 10m

Lambert-St Louis

Sun 10/19

11:32 am-9:24 am

2 stops20h 52m

$227

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/16

4:25 pm-5:10 pm

1 stop25h 45m

Lambert-St Louis

Sat 10/18

4:33 pm-11:59 pm

1 stop6h 26m

$234

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/16

Showing 1-10 of 27 results
1
2
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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, August is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $245). Flying from Trenton, New Jersey to Illinois in March is currently the most expensive (average of $321). 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 August 18, 2025.

When flying from Trenton, New Jersey to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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 August 18, 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
3,212 reviews

Overall

5.8

Entertainment

4.4

Comfort

5.6

Boarding

6.1

Food

4.7

Crew

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.
Frontier
5.8
Fair
3,212 reviews
Frontier
5.8
Fair
3,212 reviews

Overall

5.8

Entertainment

4.4

Comfort

5.6

Boarding

6.1

Food

4.7

Crew

6.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.

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 8h 59m. 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, August is the cheapest month in which you can book a flight from Trenton, New Jersey to Illinois (average of $245). Flying from Trenton, New Jersey to Illinois in March is currently the most expensive (average of $321). 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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