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$88+ 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 6/3. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — ORD
Apr 22 — Apr 291
Tue 4/22
Tue 4/29
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 April 17, 2025.

Most accurate provider

Mytrip
3 stars

Most trusted provider

Mytrip
3 stars

Round-trip from

$178
(Frontier)

One-way from

$88
(Cheapflightsfares)

Popular in

December

Cheapest in

September

Average price

$230
Provider with most accurate pricing for New York (NYC)-Chicago (CHI) flight deals.
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Provider most trusted by Cheapflights users for New York (NYC)-Chicago (CHI) flights.
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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. 3% potential increase in price ($6 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($6 potential savings vs. average RT price).
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Average for round-trip flights in April 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 April 17, 2025.

This Frontier deal was found by Cheapflights users on 4/17. 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.
Sat 5/179:00 amTTN - ORD
1 stop8h 03mFrontier
Sat 5/241:02 pmORD - TTN
1 stop8h 44mFrontier
Deal found 4/17$178
This CheapOair deal was found by Cheapflights users on 4/16. 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 4/266:45 amTTN - STL
1 stop18h 19mFrontier
Tue 5/65:45 pmSTL - TTN
1 stop27h 55mFrontier
Deal found 4/16$181

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 17, 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

Sat 5/17

9:00 am-4:03 pm

1 stop8h 03m

Chicago O'Hare Intl

Sat 5/24

1:02 pm-10:46 pm

1 stop8h 44m

$178

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 4/26

6:45 am-12:04 am

1 stop18h 19m

Lambert-St Louis

Tue 5/6

5:45 pm-10:40 pm

1 stop27h 55m

$181

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Tue 6/3

6:17 pm-12:36 am

1 stop7h 19m

$88

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 4/30

6:45 am-12:04 am

1 stop18h 19m

$96

TrentonChicago

TTN - ORD

TTNORD

Trenton-Mercer

Wed 4/23

6:45 am-3:59 pm

1 stop10h 14m

$425

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/17

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 April 17, 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 17, 2025.
Frontier
6.0
Okay
3,281 reviews

Crew

6.8

Entertainment

4.6

Overall

6.0

Comfort

5.6

Food

4.8

Boarding

6.2

Reviews

1 / 20
2.0
Mediocre

Mood Happy,Mar 2025

ONT - DFW

Very bad experience. Next time not going to this flight
Frontier
6.0
Okay
3,281 reviews
Frontier
6.0
Okay
3,281 reviews

Crew

6.8

Entertainment

4.6

Overall

6.0

Comfort

5.6

Food

4.8

Boarding

6.2

Reviews

1 / 20
2.0
Mediocre

Mood Happy,Mar 2025

ONT - DFW

Very bad experience. Next time not going to this flight

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.

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