$95+ 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 5/8. Fares are subject to change and may not be available on all flights or dates of travel.
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 April 30, 2025.
Most accurate provider | CheapOair 3 stars |
|---|---|
Most trusted provider | CheapOair 3 stars |
Round-trip from | $191 (CheapOair) |
One-way from | $95 (Frontier) |
Popular in | December |
Cheapest in | September |
Average price | $237 |
Find flight deals from Trenton to Illinois
Cheapest flights from Trenton to IllinoisExplore 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 April 30, 2025.
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 April 30, 2025.
This CheapOair deal was found by Cheapflights users on 4/29. 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.
This Frontier deal was found by Cheapflights users on 4/28. 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.
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 April 30, 2025.
Use the filters below to find and compare flights from Trenton to Illinois that are best for you.
Fly from
Fly to
Route
Depart
Return
Price
TrentonSt. Louis
TTN - STL
TTNSTL
Trenton-Mercer
Tue 5/13
8:00 am-12:06 am
1 stop17h 06m
Lambert-St Louis
Fri 5/16
5:55 pm-11:52 pm
1 stop28h 57m
TrentonChicago
TTN - ORD
TTNORD
Trenton-Mercer
Sat 5/10
9:00 am-4:03 pm
1 stop8h 03m
Chicago O'Hare Intl
Sat 5/17
9:19 am-11:29 pm
1 stop13h 10m
TrentonSt. Louis
TTN - STL
TTNSTL
Trenton-Mercer
Thu 5/8
1:42 pm-12:06 am
1 stop11h 24m
TrentonChicago
TTN - ORD
TTNORD
Trenton-Mercer
Tue 6/3
6:17 pm-12:36 am
1 stop7h 19m
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.
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 April 30, 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 April 30, 2025.
Comfort
Crew
Entertainment
Overall
Boarding
Food
Reviews
Mood Happy,Mar 2025
ONT - DFW
Comfort
Crew
Entertainment
Overall
Boarding
Food
Reviews
Mood Happy,Mar 2025
ONT - DFW