$109 Find Cheap Flights from Trenton to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Trenton to Illinois departing on 8/18. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy

KAYAK searches hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Trenton to Illinois, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Trenton to Illinois, as well as popular online travel agencies
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 20% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flights Deals
Useful Info
Flights Deals

Best Illinois Flight Deals from Trenton

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Chicago
Chicago1 stop$285
St. Louis
St. Louis1 stop$263
Chicago
Chicago1 stop$285
St. Louis
St. Louis1 stop$263

Cheap Flights from Trenton to Illinois

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Trenton to Illinois that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Trenton to Illinois

Fri, Jul 18 - Sun, Jul 20
Frontier Logo
12:48 pm - 1:59 pmTTN-STL
26h 11m1 stop
Frontier Logo
2:36 pm - 11:22 amSTL-TTN
19h 46m1 stop
$263Frontier
Find Deal
Fri, Aug 15 - Sun, Aug 17
Frontier Logo
12:48 pm - 1:59 pmTTN-STL
26h 11m1 stop
Frontier Logo
2:36 pm - 11:22 amSTL-TTN
19h 46m1 stop
$283Frontier
Find Deal
Mon, Jul 14 - Tue, Jul 15
Frontier Logo
5:15 pm - 11:31 pmTTN-ORD
7h 16m1 stop
Frontier Logo
11:28 am - 11:59 pmORD-TTN
11h 31m1 stop
$285Frontier
Find Deal
Fri, Aug 1 - Tue, Aug 5
Frontier Logo
12:48 pm - 12:22 amTTN-ORD
12h 34m1 stop
Frontier Logo
11:28 am - 11:59 pmORD-TTN
11h 31m1 stop
$286Frontier
Find Deal
Fri, Aug 15 - Mon, Aug 18
Frontier Logo
12:48 pm - 1:59 pmTTN-STL
26h 11m1 stop
Frontier Logo
5:40 pm - 11:56 pmSTL-TTN
29h 16m1 stop
$287Frontier
Find Deal
Mon, Jul 14 - Tue, Jul 15
Frontier Logo
5:15 pm - 11:31 pmTTN-ORD
7h 16m1 stop
Frontier Logo
11:28 am - 11:59 pmORD-TTN
11h 31m1 stop
$287Frontier
Find Deal
Mon, Jul 21 - Thu, Jul 24
Frontier Logo
12:48 pm - 4:38 pmTTN-ORD
28h 50m1 stop
Frontier Logo
6:16 pm - 11:22 amORD-TTN
16h 06m1 stop
$291Frontier
Find Deal
Sat, Jul 26 - Wed, Jul 30
Frontier Logo
9:29 am - 7:20 pmTTN-ORD
10h 51m1 stop
Frontier Logo
11:28 am - 11:59 pmORD-TTN
11h 31m1 stop
$292Frontier
Find Deal
Sat, Jul 12 - Mon, Jul 14
Frontier Logo
9:29 am - 7:20 pmTTN-ORD
10h 51m1 stop
Frontier Logo
5:01 am - 11:22 amORD-TTN
5h 21m1 stop
$296Frontier
Find Deal
Fri, Jul 4 - Tue, Jul 8
Frontier Logo
5:17 pm - 8:07 amTTN-ORD
15h 50m1 stop
Frontier Logo
11:59 am - 11:59 pmORD-TTN
11h 00m1 stop
$297Frontier
Find Deal
Useful Info

KAYAK's insights & trends for Trenton to Illinois flights

Get data-powered insights and trends into flights from Trenton to Illinois to help you find the cheapest flights, the best time to fly and much more.

How long does a flight from Trenton to Illinois take?

The duration of a flight to Illinois depends on your arrival airport. The shortest route to Illinois from Trenton is to Chicago, which takes 12h 59m.


Good to know

Cheapest flight$109
Flight from Trenton to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Trenton to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Trenton to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Trenton to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Trenton to Illinois is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Trenton to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Trenton to Illinois with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Trenton to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Trenton to Illinois up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • What is the cheapest time of day to fly to Illinois?

    The cheapest time of day to fly to Illinois is generally at night, when round-trip flights cost $154 on average. The most expensive time of day to fly to Illinois is generally in the morning, which is peak travel time and where the average cost of a ticket is $188.

Top airline flying from Trenton to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Trenton to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Trenton to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
5.9
FrontierOverall score based on 3295 reviews
4.8Food
5.6Comfort
4.5Entertainment
6.2Boarding
6.8Crew
Airline reviews

Book with frontier airlines with the mentality that they'll cancel your flight, kick you off and lose your luggage. Anything besides that is a win. Compare prices with other airlines (to include luggage) and if frontier is still worth it, book it but know all of their policies.

8.0 ExcellentTy, Jun 2025DFW - TPA
Read more Frontier reviews

Book with frontier airlines with the mentality that they'll cancel your flight, kick you off and lose your luggage. Anything besides that is a win. Compare prices with other airlines (to include luggage) and if frontier is still worth it, book it but know all of their policies.

You get what you pay for nothing essentially but a hard uncomfortable seat that doesn’t recline and kids screaming all around you and chaotic boarding and limited check bag weight allowance when compared to other airlines

I never got to experience the flight because they delayed my first flight and I missed this one. Then Frontier didn't want to help me rebook a flight to get me to my final destination.

The Boarding process in Denver was chaotic, and since the line was so long, we were lined up very far from the gate. If there were any announcements from the gate staff, we didn't hear them. The flight attendants were spectacular. The only negative part of the flight was sitting by a 2 1/2 year old who was unruly and unfortunately had parents that matched his behaviors. Also, the restaurants in Denver on the E concourse, they didn't have food (passengers could only order 1 item on the entire menu) or the restaurants had 12-14 people waiting for orders to be prepared and another 6 people waiting to order. If you have a layover in Denver and need to grab food, be prepared to visit the shops with pre-packaged sandwiches, or you can visit another concourse but it may take a while to transit throughout the airport.

I liked the turn-style feature at gate 209B at LAX. Very efficient process. The gate staff also made several, clearly directed announcements so I felt very informed.

Although an hour and a half early was told by staff at check in they had overbooked and could not check us in for the flight.

The crew was delayed because they came on another flight that was delayed due to weather 10pm flight left at 1.30 am The airline made no effort to align alternate crew

Plane was down graded and I lost my uncharged exit row with more leg room. No mention or offer of refund from podium. Flight attendant was nice to explain this happens often and that I could request a refund via online form submission. I did this and have heard nothing back.

Worst airline experience. They were rude and kept changing our seats and/or giving our seats away so our family didn’t get to sit with each other. Almost everyone we dealt with at both airports with this airline was rude. The app kept giving us wrong information making things take longer. Dealing with them before TSA can take close to an hour…longer than I’ve ever had to deal with before. Never using this airline again.

Horrendous. I do not recommend Frontier. The passengers lack manners and decency, and the flight attendants lack professionalism. If I wasn’t in a bind to fly with 48 hours notice for a job interview, I would not have selected a flight with Frontier and I never plan to fly with them in the future.

Everything you need to know for your flight from Trenton to Illinois

Information on your arrival and departure airports

Not what you’re looking for? Find thousands of other hotels, flights, car rentals and package deals with KAYAK.