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$75+ 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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — STL
ago. 26 — sep. 21
mar. 8/26
mar. 9/2
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 agosto 21, 2025.

Round-trip from

$198
(FlightHub)

One-way from

$75
(Cheapflightsfares)

Popular in

December

Cheapest in

January

Average price

$336
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. 8% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in August 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 agosto 21, 2025.

This FlightHub deal was found by Cheapflights users on 8/19. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 9/1110:30 amTTN - STL
1 stop5h 34mFrontier
dom. 9/141:52 pmSTL - TTN
1 stop20h 08mFrontier
Deal found 8/19$198
This FlightHub deal was found by Cheapflights users on 8/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jue. 10/164:25 pmTTN - STL
1 stop25h 45mFrontier
sáb. 10/184:33 pmSTL - TTN
1 stop16h 41mFrontier
Deal found 8/20$215
This FlightHub deal was found by Cheapflights users on 8/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
vie. 10/311:45 amTTN - STL
1 stop9h 52mFrontier
jue. 10/96:05 pmSTL - TTN
1 stop28h 54mFrontier
Deal found 8/20$225
This Booking.com deal was found by Cheapflights users on 8/20. 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.
jue. 12/1112:45 pmTTN - STL
1 stop21h 00mFrontier
dom. 12/145:11 pmSTL - TTN
1 stop24h 26mFrontier
Deal found 8/20$230
This Frontier deal was found by Cheapflights users on 8/21. 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.
lun. 8/256:00 amTTN - STL
1 stop9h 21mFrontier
vie. 8/293:16 pmSTL - TTN
1 stop7h 40mFrontier
Deal found 8/21$248
This Frontier deal was found by Cheapflights users on 8/19. 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.
jue. 8/286:00 amTTN - STL
1 stop8h 07mFrontier
lun. 9/13:16 pmSTL - TTN
1 stop7h 40mFrontier
Deal found 8/19$298
This Frontier deal was found by Cheapflights users on 8/19. 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.
dom. 10/510:30 amTTN - STL
1 stop5h 34mFrontier
jue. 10/911:32 amSTL - TTN
2 stops20h 52mFrontier
Deal found 8/19$321
This CheapOair deal was found by Cheapflights users on 8/20. 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.
jue. 9/1810:30 amTTN - STL
1 stop5h 34mFrontier
dom. 9/2110:39 amSTL - TTN
2 stops23h 55mFrontier
Deal found 8/20$331
This Frontier deal was found by Cheapflights users on 8/21. 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.
jue. 9/410:30 amTTN - STL
1 stop5h 34mFrontier
dom. 9/77:55 pmSTL - TTN
2 stops14h 39mFrontier
Deal found 8/21$347
This Frontier deal was found by Cheapflights users on 8/20. 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.
vie. 10/311:45 amTTN - STL
1 stop9h 52mFrontier
dom. 10/57:55 pmSTL - TTN
2 stops14h 05mFrontier
Deal found 8/20$391

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 agosto 21, 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

jue. 9/11

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

dom. 9/14

1:52 pm-11:00 am

1 stop20h 08m

$198

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

jue. 10/16

4:25 pm-5:10 pm

1 stop25h 45m

Lambert-St Louis

sáb. 10/18

4:33 pm-11:59 pm

1 stop6h 26m

$215

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

dom. 10/5

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

sáb. 10/11

4:33 pm-10:14 am

1 stop16h 41m

$215

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

vie. 10/3

11:45 am-8:37 pm

1 stop9h 52m

Lambert-St Louis

jue. 10/9

6:05 pm-11:59 pm

1 stop28h 54m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

jue. 9/25

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

vie. 9/26

1:57 pm-11:00 am

1 stop20h 03m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

jue. 9/18

4:57 pm-1:02 pm

1 stop21h 05m

Lambert-St Louis

dom. 9/21

1:52 pm-11:00 am

1 stop20h 08m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

jue. 10/23

4:25 pm-5:10 pm

1 stop25h 45m

Lambert-St Louis

dom. 10/26

1:41 pm-11:59 pm

1 stop9h 18m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

dom. 9/21

4:57 pm-1:02 pm

1 stop21h 05m

Lambert-St Louis

vie. 9/26

1:57 pm-11:00 am

1 stop20h 03m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

dom. 10/5

10:30 am-3:04 pm

1 stop5h 34m

Lambert-St Louis

jue. 10/9

6:05 pm-11:59 pm

1 stop28h 54m

$225

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

vie. 10/3

11:45 am-8:37 pm

1 stop9h 52m

Lambert-St Louis

dom. 10/5

1:57 pm-11:00 am

1 stop20h 03m

$225

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/20

Showing 1-10 of 17 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
O'Fallon
Fairview Heights
Maryland Heights
Collinsville
Eureka
St. Peters
Glencoe
Alton
Chesterfield
Farmington
Festus

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