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$77+ Cheap flights from Trenton, NJ to St. Louis (TTN - STL)

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 10/12. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — STL
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheap flight deals from Trenton to St. Louis

Discover tips and strategies to find the most affordable flight options for your journey from Trenton (TTN) to St. Louis (STL). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2025.

Round-trip from

$154
(Frontier)

One-way from

$77
(Frontier)

Popular in

December

Cheapest in

January

Average price

$357
From Trenton-Mercer to Lambert-St Louis
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One-way flight from Trenton-Mercer to Lambert-St Louis
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Highest demand for flights based on searches. 9% potential increase in price ($36 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($7 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Trenton to St. Louis

Cheapest flights from Trenton to St. Louis
Explore the most affordable flight options available from Trenton to St. Louis. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/14. 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.
Sun 9/2810:30 amTTN - STL
1 stop5h 34mFrontier
Sat 10/114:33 pmSTL - TTN
1 stop6h 26mFrontier
Deal found 9/14$154
This CheapOair deal was found by Cheapflights users on 9/16. 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.
Fri 10/311:45 amTTN - STL
1 stop9h 52mFrontier
Sun 10/54:00 pmSTL - TTN
1 stop18h 34mFrontier
Deal found 9/16$165
This Booking.com deal was found by Cheapflights users on 9/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/2510:30 amTTN - STL
1 stop5h 34mFrontier
Sun 10/51:57 pmSTL - TTN
1 stop20h 03mFrontier
Deal found 9/17$166
This Frontier deal was found by Cheapflights users on 9/15. 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 10/236:00 amTTN - STL
1 stop7h 46mFrontier
Fri 10/312:12 pmSTL - TTN
1 stop8h 47mFrontier
Deal found 9/15$169
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Thu 9/2510:30 amTTN - STL
1 stop5h 34mFrontier
Sun 9/284:00 pmSTL - TTN
1 stop18h 34mFrontier
Deal found 9/15$173
This Frontier deal was found by Cheapflights users on 9/15. 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 10/236:00 amTTN - STL
1 stop7h 46mFrontier
Thu 10/302:12 pmSTL - TTN
1 stop8h 47mFrontier
Deal found 9/15$184
This Frontier deal was found by Cheapflights users on 9/15. 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 10/106:00 amTTN - STL
1 stop12h 10mFrontier
Sun 10/121:41 pmSTL - TTN
1 stop9h 18mFrontier
Deal found 9/15$190
This Frontier deal was found by Cheapflights users on 9/16. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/99:00 amTTN - STL
1 stop9h 10mFrontier
Sun 10/121:41 pmSTL - TTN
1 stop9h 18mFrontier
Deal found 9/16$204
This Frontier deal was found by Cheapflights users on 9/15. 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 10/188:00 amTTN - STL
1 stop8h 38mFrontier
Thu 10/302:12 pmSTL - TTN
1 stop8h 47mFrontier
Deal found 9/15$205
This Booking.com deal was found by Cheapflights users on 9/17. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/134:27 pmTTN - STL
1 stop24h 53mFrontier
Sat 11/154:33 pmSTL - TTN
1 stop6h 26mFrontier
Deal found 9/17$216
This Frontier deal was found by Cheapflights users on 9/15. 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.
Sun 10/196:00 amTTN - STL
1 stop7h 46mFrontier
Fri 10/312:12 pmSTL - TTN
1 stop8h 47mFrontier
Deal found 9/15$218
This Frontier deal was found by Cheapflights users on 9/15. 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 10/210:30 amTTN - STL
1 stop5h 34mFrontier
Thu 10/911:32 amSTL - TTN
2 stops11h 27mFrontier
Deal found 9/15$222

Cheapflights Fare Finder

 
Customize your flight search to find flights from Trenton to St. Louis 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 September 17, 2025.
Use the filters below to find and compare flights from Trenton to St. Louis that are best for you.

Fly from

Trenton

Fly to

St. Louis

Route

Depart

Return

Price

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 9/28

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

Sat 10/11

4:33 pm-11:59 pm

1 stop6h 26m

$154

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/2

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

Sat 10/11

4:33 pm-11:59 pm

1 stop6h 26m

$154

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 10/3

11:45 am-8:37 pm

1 stop9h 52m

Lambert-St Louis

Sat 10/11

4:33 pm-11:59 pm

1 stop6h 26m

$154

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/9

9:00 am-5:10 pm

1 stop9h 10m

Lambert-St Louis

Fri 10/10

6:05 pm-11:59 pm

1 stop28h 54m

$166

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/23

6:00 am-12:46 pm

1 stop7h 46m

Lambert-St Louis

Fri 10/31

2:12 pm-11:59 pm

1 stop8h 47m

$169

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/23

6:00 am-12:46 pm

1 stop7h 46m

Lambert-St Louis

Thu 10/30

2:12 pm-11:59 pm

1 stop8h 47m

$184

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/23

6:00 am-12:46 pm

1 stop7h 46m

Lambert-St Louis

Sat 10/25

4:33 pm-11:59 pm

1 stop6h 26m

$205

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/2

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

Thu 10/9

11:32 am-11:59 pm

2 stops11h 27m

$222

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 10/3

11:45 am-8:37 pm

1 stop9h 52m

Lambert-St Louis

Thu 10/9

11:32 am-11:59 pm

2 stops11h 27m

$224

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 10/24

6:00 am-5:47 pm

1 stop12h 47m

Lambert-St Louis

Sat 10/25

4:33 pm-11:59 pm

1 stop6h 26m

$226

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/15

Showing 1-10 of 19 results
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Best time to book a flight from Trenton to St. Louis

Have a flexible travel schedule? Discover the best time to fly to St. Louis 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 St. Louis

What is the cheapest month to book a flight from Trenton, New Jersey to St. Louis?

Currently, August is the cheapest month in which you can book a flight from Trenton, New Jersey to St. Louis (average of $311). Flying from Trenton, New Jersey to St. Louis in March is currently the most expensive (average of $356). 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 Trenton to St. Louis. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Trenton, New Jersey to St. Louis?

    There are many flights that can get you from Trenton, New Jersey to St. Louis in 5h 34m. Fly via Frontier to get the fastest option. The distance between Trenton, New Jersey and St. Louis is about 834 mi.

  • Can I find deals for flights from Trenton to St. Louis that include hotel bookings?

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

  • How can I find direct flights from Trenton to St. Louis?

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

  • Can I find deals for business class flights from Trenton to St. Louis?

    Yes. Cheapflights offers flight deals from Trenton to St. Louis 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 St. Louis?

    Currently, August is the cheapest month in which you can book a flight from Trenton, New Jersey to St. Louis (average of $311). Flying from Trenton, New Jersey to St. Louis in March is currently the most expensive (average of $356). 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

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
Edwardsville
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
St. Peters
Chesterfield
Alton
Farmington
Festus

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