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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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
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 February 12, 2026.

This Mytrip deal was found by Cheapflights users on 2/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/26:00 am
TTN
-
ORD
1 stop18h 15m
Frontier
Wed 3/48:30 am
ORD
-
TTN
1 stop24h 16m
Frontier
Deal found 2/10$144
This Frontier deal was found by Cheapflights users on 2/9. 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 5/710:49 am
TTN
-
STL
1 stop13h 30m
Frontier
Mon 5/114:55 pm
STL
-
TTN
1 stop6h 04m
Frontier
Deal found 2/9$160
This Frontier deal was found by Cheapflights users on 2/10. 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.
Sun 4/129:04 pm
TTN
-
ORD
1 stop12h 13m
Frontier
Thu 4/1610:25 am
ORD
-
TTN
1 stop12h 34m
Frontier
Deal found 2/10$160
This Mytrip deal was found by Cheapflights users on 2/8. 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.
Tue 2/248:00 am
TTN
-
STL
1 stop15h 27m
Frontier
Sat 2/283:49 pm
STL
-
TTN
1 stop6h 50m
Frontier
Deal found 2/8$166
This CheapOair deal was found by Cheapflights users on 2/10. 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.
Thu 2/266:00 am
TTN
-
STL
1 stop18h 59m
Frontier
Sat 2/283:49 pm
STL
-
TTN
1 stop14h 58m
Frontier
Deal found 2/10$171
This CheapOair deal was found by Cheapflights users on 2/9. 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 5/155:37 pm
TTN
-
ORD
1 stop22h 48m
Frontier
Mon 5/186:57 am
ORD
-
TTN
1 stop16h 02m
Frontier
Deal found 2/9$171
This Super.com deal was found by Cheapflights users on 2/10. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 2/276:45 am
TTN
-
ORD
1 stop15h 55m
Frontier
Wed 3/48:30 am
ORD
-
TTN
1 stop24h 16m
Frontier
Deal found 2/10$176
This Frontier deal was found by Cheapflights users on 2/11. 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.
Sat 3/73:04 pm
TTN
-
STL
1 stop9h 15m
Frontier
Tue 3/104:51 pm
STL
-
TTN
1 stop6h 08m
Frontier
Deal found 2/11$179
This Frontier deal was found by Cheapflights users on 2/9. 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 2/2311:54 am
TTN
-
STL
1 stop13h 05m
Frontier
Thu 2/263:49 pm
STL
-
TTN
1 stop6h 50m
Frontier
Deal found 2/9$181
This Frontier deal was found by Cheapflights users on 2/10. 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.
Fri 4/173:52 pm
TTN
-
ORD
1 stop9h 06m
Frontier
Sun 4/1910:25 am
ORD
-
TTN
1 stop12h 34m
Frontier
Deal found 2/10$181
This Super.com deal was found by Cheapflights users on 2/9. 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 3/56:45 am
TTN
-
ORD
1 stop27h 21m
Frontier
Tue 3/104:18 pm
ORD
-
TTN
1 stop6h 41m
Frontier
Deal found 2/9$185
This Super.com deal was found by Cheapflights users on 2/11. 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 Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/248:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Wed 2/258:30 am
ORD
-
TTN
1 stop14h 09m
Frontier
Deal found 2/11$187

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 February 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$144
(Mytrip)

One-way from

$64
(Mytrip)

Popular in

August

Cheapest in

January

Average price

$206
Provider with most accurate pricing for New York (NYC)-Chicago (CHI) flight deals.
Search Deals
Provider most trusted by Cheapflights users for New York (NYC)-Chicago (CHI) flights.
Search Deals
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 ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($4 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 12, 2026.
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

Thu 5/7

10:49 am-11:19 pm

1 stop13h 30m

Lambert-St Louis

Mon 5/11

4:55 pm-11:59 pm

1 stop6h 04m

$160

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 4/20

6:00 am-2:17 pm

1 stop9h 17m

Chicago O'Hare Intl

Fri 4/24

6:57 am-4:52 pm

1 stop8h 55m

$160

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 4/27

6:00 am-2:17 pm

1 stop9h 17m

Chicago O'Hare Intl

Thu 4/30

10:25 am-11:59 pm

1 stop12h 34m

$160

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 2/24

8:00 am-10:27 pm

1 stop15h 27m

Lambert-St Louis

Sat 2/28

3:49 pm-11:39 pm

1 stop6h 50m

$166

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 4/24

3:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Sat 5/9

8:00 am-9:54 am

1 stop24h 54m

$171

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 3/7

3:04 pm-11:19 pm

1 stop9h 15m

Lambert-St Louis

Tue 3/10

4:51 pm-11:59 pm

1 stop6h 08m

$179

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 2/23

11:54 am-11:59 pm

1 stop13h 05m

Lambert-St Louis

Thu 2/26

3:49 pm-11:39 pm

1 stop6h 50m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 2/23

11:54 am-11:15 pm

1 stop12h 21m

Chicago O'Hare Intl

Fri 2/27

3:11 pm-11:39 pm

1 stop7h 28m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Fri 5/1

3:52 pm-11:58 pm

1 stop9h 06m

Chicago O'Hare Intl

Mon 5/4

6:57 am-4:52 pm

1 stop8h 55m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 2/23

6:00 am-11:15 pm

1 stop18h 15m

Chicago O'Hare Intl

Wed 2/25

8:30 am-9:46 am

1 stop24h 16m

$181

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/11

Showing 1-10 of 41 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 $119). 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 fly from Trenton, New Jersey to Illinois in about 13h 30m. 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, 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 $119). 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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