HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Illinois

$109+ 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 8/18. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Trenton to Illinois with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

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 June 12, 2025.

Round-trip from

$263
(Booking.com)

One-way from

$109
(FlightHub)

Popular in

December

Cheapest in

September

Average price

$268
From Trenton-Mercer to Illinois
Search Deals
One-way flight from Trenton-Mercer to Illinois
Search Deals
Highest demand for flights based on searches. 2% potential increase in price ($4 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease ($5 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 12, 2025.

This Booking.com deal was found by Cheapflights users on 6/10. 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.
Fri 7/1812:48 pmTTN - STL
1 stop26h 11mFrontier
Sun 7/202:36 pmSTL - TTN
1 stop19h 46mFrontier
Deal found 6/10$263
This Frontier deal was found by Cheapflights users on 6/12. 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.
Sat 7/129:29 amTTN - ORD
1 stop10h 51mFrontier
Wed 7/1611:28 amORD - TTN
1 stop11h 31mFrontier
Deal found 6/12$277

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 June 12, 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

Fri 7/18

12:48 pm-1:59 pm

1 stop26h 11m

Lambert-St Louis

Sun 7/20

2:36 pm-11:22 am

1 stop19h 46m

$263

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Sat 7/12

9:29 am-7:20 pm

1 stop10h 51m

Chicago O'Hare Intl

Wed 7/16

11:28 am-11:59 pm

1 stop11h 31m

$277

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Mon 8/18

5:15 pm-11:31 pm

1 stop7h 16m

$109

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 7/14

5:15 pm-11:47 pm

1 stop7h 32m

$161

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/10

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 June 12, 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.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Illinois, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

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 June 12, 2025.
Frontier
6.0
Okay
3,295 reviews

Food

4.8

Entertainment

4.6

Boarding

6.2

Overall

6.0

Comfort

5.6

Crew

6.8

Reviews

1 / 20
4.0
Okay

Paulina,Jun 2025

MSY - DEN

The staff in the plane and outside of the plane were very rude. My flight was delayed 3 times which i understand was not the staff’s fault but my boarding pass time was never updated which had multiple people very confused and when I asked the question of why no answer was given. They made a handful of people check their bag and upon entering the plane there was still plenty of room.
Frontier
6.0
Okay
3,295 reviews
Frontier
6.0
Okay
3,295 reviews

Food

4.8

Entertainment

4.6

Boarding

6.2

Overall

6.0

Comfort

5.6

Crew

6.8

Reviews

1 / 20
4.0
Okay

Paulina,Jun 2025

MSY - DEN

The staff in the plane and outside of the plane were very rude. My flight was delayed 3 times which i understand was not the staff’s fault but my boarding pass time was never updated which had multiple people very confused and when I asked the question of why no answer was given. They made a handful of people check their bag and upon entering the plane there was still plenty of room.

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.

  • 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Trenton to Illinois

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Los Angeles flights
John F Kennedy Intl to Miami flights
John F Kennedy Intl to O'Hare Intl flights
Newark to Fort Lauderdale flights
John F Kennedy Intl to Orlando flights
John F Kennedy Intl to Seattle flights
LaGuardia to Miami flights
LaGuardia to Dallas/Fort Worth flights
Newark to Miami flights
Newark to Seattle flights
Newark to Los Angeles flights
LaGuardia to Fort Lauderdale flights
Newark to Orlando flights
John F Kennedy Intl to Fort Lauderdale flights
John F Kennedy Intl to San Francisco flights
LaGuardia to O'Hare Intl flights
John F Kennedy Intl to Las Vegas flights
Newark to O'Hare Intl flights
LaGuardia to Denver flights
John F Kennedy Intl to Atlanta flights
Newark to San Francisco flights
John F Kennedy Intl to Dallas/Fort Worth flights
Newark to Las Vegas flights
LaGuardia to Orlando flights
LaGuardia to Los Angeles flights
LaGuardia to Atlanta flights
John F Kennedy Intl to Denver flights
Newark to Dallas/Fort Worth flights
John F Kennedy Intl to Hobby flights
Newark to Denver flights
LaGuardia to Seattle flights
LaGuardia to Hobby flights
Newark to Midway flights
Newark to Atlanta flights
John F Kennedy Intl to West Palm Beach flights
Philadelphia to O'Hare Intl flights
LaGuardia to Las Vegas flights
John F Kennedy Intl to Midway flights
Philadelphia to Orlando flights
John F Kennedy Intl to Honolulu flights
LaGuardia to San Francisco flights
John F Kennedy Intl to Tampa flights
Philadelphia to Seattle flights
John F Kennedy Intl to San Diego flights
Philadelphia to Denver flights
Newark to Tampa flights
Newark to New Orleans flights
John F Kennedy Intl to Ontario flights
Newark to Burbank flights
Philadelphia to Fort Lauderdale flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.