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$70+ 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 2/25. Fares are subject to change and may not be available on all flights or dates of travel.
TTN — STL
Feb 5 — Feb 121
Thu 2/5
Thu 2/12
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 January 6, 2026.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$144
(Mytrip)

One-way from

$70
(Frontier)

Popular in

November

Cheapest in

March

Average price

$331
Provider with most accurate pricing for Trenton-Mercer-Lambert-St Louis flight deals.
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Provider most trusted by Cheapflights users for Trenton-Mercer-Lambert-St Louis flights.
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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. 14% potential increase in price ($57 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 January 2026
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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 January 6, 2026.

This Frontier deal was found by Cheapflights users on 1/6. 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.
Tue 2/33:21 pmTTN - STL
1 stop9h 12mFrontier
Tue 2/103:49 pmSTL - TTN
1 stop6h 50mFrontier
Deal found 1/6$128
This Mytrip deal was found by Cheapflights users on 1/5. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 1/268:27 pmTTN - STL
1 stop28h 06mFrontier
Wed 1/285:42 pmSTL - TTN
1 stop16h 27mFrontier
Deal found 1/5$144
This Mytrip deal was found by Cheapflights users on 1/5. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/33:21 pmTTN - STL
1 stop9h 12mFrontier
Wed 2/45:42 pmSTL - TTN
1 stop16h 27mFrontier
Deal found 1/5$150
This Booking.com deal was found by Cheapflights users on 1/6. 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.
Wed 1/283:21 pmTTN - STL
1 stop9h 12mFrontier
Sat 1/315:42 pmSTL - TTN
1 stop13h 54mFrontier
Deal found 1/6$151
This Kiwi.com deal was found by Cheapflights users on 1/6. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 1/237:36 pmTTN - STL
1 stop16h 35mFrontier
Tue 1/275:42 pmSTL - TTN
1 stop19h 44mFrontier
Deal found 1/6$156
This Expedia deal was found by Cheapflights users on 1/5. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 1/203:21 pmTTN - STL
1 stop9h 12mFrontier
Sat 1/245:42 pmSTL - TTN
1 stop13h 54mFrontier
Deal found 1/5$160
This Booking.com deal was found by Cheapflights users on 1/4. 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.
Tue 1/203:21 pmTTN - STL
1 stop9h 12mFrontier
Thu 1/225:42 pmSTL - TTN
1 stop23h 56mFrontier
Deal found 1/4$167
This Frontier deal was found by Cheapflights users on 1/5. 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.
Mon 3/211:54 amTTN - STL
1 stop13h 05mFrontier
Tue 3/33:49 pmSTL - TTN
1 stop6h 50mFrontier
Deal found 1/5$181
This Booking.com deal was found by Cheapflights users on 1/5. 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.
Sun 1/259:06 pmTTN - STL
1 stop27h 27mFrontier
Sat 1/3112:12 pmSTL - TTN
1 stop6h 12mFrontier
Deal found 1/5$186
This Frontier deal was found by Cheapflights users on 1/5. 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.
Tue 1/203:21 pmTTN - STL
1 stop9h 12mFrontier
Fri 1/2311:18 amSTL - TTN
1 stop6h 20mFrontier
Deal found 1/5$195
This Mytrip deal was found by Cheapflights users on 1/5. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/298:38 pmTTN - STL
1 stop14h 45mFrontier
Fri 1/305:42 pmSTL - TTN
1 stop16h 27mFrontier
Deal found 1/5$207
This Booking.com deal was found by Cheapflights users on 1/5. 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.
Wed 2/43:21 pmTTN - STL
1 stop9h 12mFrontier
Thu 2/55:42 pmSTL - TTN
1 stop23h 56mFrontier
Deal found 1/5$232

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 January 6, 2026.
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

Tue 2/3

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Tue 2/10

3:49 pm-11:39 pm

1 stop6h 50m

$128

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 1/26

8:27 pm-11:33 pm

1 stop28h 06m

Lambert-St Louis

Wed 1/28

5:42 pm-11:09 am

1 stop16h 27m

$144

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 2/5

12:04 pm-11:33 pm

1 stop12h 29m

Lambert-St Louis

Sat 2/7

12:12 pm-7:24 pm

1 stop6h 12m

$151

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 3/3

8:00 am-10:27 pm

1 stop15h 27m

Lambert-St Louis

Wed 3/4

3:49 pm-11:39 pm

1 stop6h 50m

$151

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Fri 1/23

7:36 pm-11:11 am

1 stop16h 35m

Lambert-St Louis

Tue 1/27

5:42 pm-2:26 pm

1 stop19h 44m

$156

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 1/20

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Sat 1/24

5:42 pm-8:36 am

1 stop13h 54m

$160

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 1/21

3:21 pm-11:33 pm

1 stop9h 12m

Lambert-St Louis

Thu 1/22

5:42 pm-6:38 pm

1 stop23h 56m

$167

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 1/24

12:04 pm-11:33 pm

1 stop12h 29m

Lambert-St Louis

Mon 1/26

10:16 am-7:32 pm

1 stop8h 16m

$167

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 3/2

11:54 am-11:59 pm

1 stop13h 05m

Lambert-St Louis

Tue 3/3

3:49 pm-11:39 pm

1 stop6h 50m

$181

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sun 1/25

9:06 pm-11:33 pm

1 stop27h 27m

Lambert-St Louis

Sat 1/31

12:12 pm-7:24 pm

1 stop6h 12m

$186

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/6

Showing 1-10 of 24 results
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Compare providers for flights from Trenton to St. Louis

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Trenton to St. Louis in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Trenton, New Jersey-St. Louis flights, users find the pricing of eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Trenton, New Jersey-St. Louis flight deals on Cheapflights vs. eDreams >95% of the time. Price accuracy is based on data collected from Trenton, New Jersey-St. Louis flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Trenton, New Jersey-St. Louis flights, Cheapflights users trust eDreams the most. eDreams has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Trenton, New Jersey-St. Louis flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

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, March is the cheapest month in which you can book a flight from Trenton, New Jersey to St. Louis (average of $59). Flying from Trenton, New Jersey to St. Louis in December is currently the most expensive (average of $217). 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 9h 12m. 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, March is the cheapest month in which you can book a flight from Trenton, New Jersey to St. Louis (average of $59). Flying from Trenton, New Jersey to St. Louis in December is currently the most expensive (average of $217). 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
Swansea
Fairview Heights
Maryland Heights
Collinsville
Eureka
Glencoe
Chesterfield
Alton
Farmington
Festus

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