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Trenton

$69+ Cheap flights from Illinois to Trenton, NJ (TTN)

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 2/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — TTN
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap flight deals from Illinois to Trenton

Cheapest flights from Illinois to Trenton
Explore the most affordable flight options available from Illinois to Trenton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This Booking.com deal was found by Cheapflights users on 1/19. 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.
Wed 2/183:49 pm
STL
-
TTN
1 stop16h 57m
Frontier
Wed 2/258:00 am
TTN
-
STL
1 stop15h 27m
Frontier
Deal found 1/19$140
This CheapOair deal was found by Cheapflights users on 1/19. 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.
Wed 2/188:30 am
ORD
-
TTN
1 stop24h 16m
Frontier
Wed 2/258:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Deal found 1/19$145
This Frontier deal was found by Cheapflights users on 1/20. 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 2/911:51 am
ORD
-
TTN
1 stop6h 41m
Frontier
Wed 2/188:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Deal found 1/20$160
This Frontier deal was found by Cheapflights users on 1/21. 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 2/53:55 pm
ORD
-
TTN
1 stop18h 06m
Frontier
Mon 2/98:27 pm
TTN
-
ORD
1 stop20h 25m
Frontier
Deal found 1/21$162
This Frontier deal was found by Cheapflights users on 1/20. 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 2/2611:55 am
ORD
-
TTN
1 stop10h 44m
Frontier
Wed 3/48:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Deal found 1/20$165
This Booking.com deal was found by Cheapflights users on 1/18. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/712:12 pm
STL
-
TTN
1 stop6h 12m
Frontier
Mon 2/98:27 pm
TTN
-
STL
1 stop27h 00m
Frontier
Deal found 1/18$167
This Mytrip deal was found by Cheapflights users on 1/20. 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 2/79:25 am
ORD
-
TTN
1 stop8h 59m
Frontier
Mon 2/98:27 pm
TTN
-
ORD
1 stop20h 25m
Frontier
Deal found 1/20$169
This Frontier deal was found by Cheapflights users on 1/20. 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.
Wed 4/18:10 am
ORD
-
TTN
1 stop7h 17m
Frontier
Wed 4/812:26 pm
TTN
-
ORD
1 stop12h 10m
Frontier
Deal found 1/20$175
This Frontier deal was found by Cheapflights users on 1/20. 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 2/273:11 pm
ORD
-
TTN
1 stop7h 28m
Frontier
Wed 3/48:00 am
TTN
-
ORD
1 stop8h 52m
Frontier
Deal found 1/20$179
This Frontier deal was found by Cheapflights users on 1/20. 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.
Tue 3/33:49 pm
STL
-
TTN
1 stop6h 50m
Frontier
Mon 3/92:59 pm
TTN
-
STL
1 stop9h 20m
Frontier
Deal found 1/20$179
This Frontier deal was found by Cheapflights users on 1/20. 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 2/2611:55 am
ORD
-
TTN
1 stop10h 44m
Frontier
Mon 3/211:54 am
TTN
-
ORD
1 stop12h 21m
Frontier
Deal found 1/20$181
This CheapOair deal was found by Cheapflights users on 1/18. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 2/218:15 am
ORD
-
TTN
1 stop14h 24m
Frontier
Mon 2/236:00 am
TTN
-
ORD
1 stop18h 15m
Frontier
Deal found 1/18$182

Find flight deals from Illinois to Trenton

Keep the following information in mind while searching for Illinois to Trenton flight deals. Data was last updated January 21, 2026.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$140
(Booking.com)

One-way from

$69
(Super.com)

Popular in

June

Cheapest in

January

Average price

$153
Provider with most accurate pricing for Chicago (CHI)-New York (NYC) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Chicago (CHI)-New York (NYC) flights.
Search Deals
From Illinois to Trenton-Mercer
Search Deals
One-way flight from Illinois to Trenton-Mercer
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($15 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 January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Trenton 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 January 21, 2026.
Use the filters below to find and compare flights from Illinois to Trenton that are best for you.

Fly from

Illinois

Fly to

Trenton

Route

Depart

Return

Price

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Wed 2/18

3:49 pm-9:46 am

1 stop16h 57m

Trenton-Mercer

Wed 2/25

8:00 am-10:27 pm

1 stop15h 27m

$140

ChicagoTrenton

ORD - TTN

ORDTTN

Chicago O'Hare Intl

Wed 2/18

8:30 am-9:46 am

1 stop24h 16m

Trenton-Mercer

Wed 2/25

8:00 am-3:52 pm

1 stop8h 52m

$145

ChicagoTrenton

ORD - TTN

ORDTTN

Chicago O'Hare Intl

Thu 2/5

3:55 pm-11:01 am

1 stop18h 06m

Trenton-Mercer

Mon 2/9

8:27 pm-3:52 pm

1 stop20h 25m

$162

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Sat 2/7

12:12 pm-7:24 pm

1 stop6h 12m

Trenton-Mercer

Mon 2/9

8:27 pm-10:27 pm

1 stop27h 00m

$167

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Wed 4/8

4:54 pm-10:04 am

1 stop16h 10m

Trenton-Mercer

Thu 4/9

9:04 pm-7:51 am

1 stop11h 47m

$169

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Wed 3/4

3:49 pm-11:39 pm

1 stop6h 50m

Trenton-Mercer

Mon 3/9

2:59 pm-11:19 pm

1 stop9h 20m

$179

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Tue 3/3

3:49 pm-11:39 pm

1 stop6h 50m

Trenton-Mercer

Mon 3/9

2:59 pm-11:19 pm

1 stop9h 20m

$179

ChicagoTrenton

ORD - TTN

ORDTTN

Chicago O'Hare Intl

Thu 2/26

11:55 am-11:39 pm

1 stop10h 44m

Trenton-Mercer

Mon 3/2

11:54 am-11:15 pm

1 stop12h 21m

$181

ChicagoTrenton

ORD - TTN

ORDTTN

Chicago O'Hare Intl

Sat 2/21

8:15 am-11:39 pm

1 stop14h 24m

Trenton-Mercer

Mon 2/23

6:00 am-11:15 pm

1 stop18h 15m

$182

ChicagoTrenton

ORD - TTN

ORDTTN

Chicago O'Hare Intl

Sat 2/28

8:15 am-11:39 pm

1 stop14h 24m

Trenton-Mercer

Tue 3/3

8:00 am-3:52 pm

1 stop8h 52m

$187

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

Showing 1-10 of 39 results
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Best time to book a flight from Illinois to Trenton

Have a flexible travel schedule? Discover the best time to fly to Trenton from Illinois 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 Illinois to Trenton

What is the cheapest month to book a flight from Illinois to Trenton, New Jersey?

Currently, January is the cheapest month in which you can book a flight from Illinois to Trenton, New Jersey (average of $36). Flying from Illinois to Trenton, New Jersey in July is currently the most expensive (average of $103). 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 Illinois to Trenton. 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 into for flights to Trenton from Illinois?

    Most people fly into Trenton-Mercer (TTN) if they book a flight to Trenton from Illinois. Trenton-Mercer is conveniently located just 4.8 mi from Trenton’s city center.

  • How long is the flight from Illinois to Trenton, New Jersey?

    For as low as $140, Frontier can have you in Trenton, New Jersey from Illinois in 16h 57m. The distance from Illinois to Trenton, New Jersey is about 834 mi.

  • Can I find deals for flights from Illinois to Trenton that include hotel bookings?

    Yes. In addition to deals on Illinois to Trenton flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Trenton?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Trenton.

  • Can I find deals for business class flights from Illinois to Trenton?

    Yes. Cheapflights offers flight deals from Illinois to Trenton 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 Illinois to Trenton, New Jersey?

    Currently, January is the cheapest month in which you can book a flight from Illinois to Trenton, New Jersey (average of $36). Flying from Illinois to Trenton, New Jersey in July is currently the most expensive (average of $103). 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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