In terms of precipitation, rainfall in St. Louis ranges from 2.2 - 4.7 inches per month. May is typically the wettest month, when rainfall can reach 4.7 in. February is typically the driest time to visit St. Louis when rainfall is around 2.2 in.

If weather is an important factor for your trip to St. Louis, 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 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

How far in advance should I book a flight from Trenton, New Jersey to St. Louis?

Users have found that booking a flight from Trenton, New Jersey to St. Louis at least 50 days early can save you up to 63% on average compared to booking a flight this week. If booking 50 days before your flight isn’t an option for you, users have found flights from Trenton, New Jersey to St. Louis for as little as $379 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $411 for flights departing within the next 3 days.

What is the cheapest month to fly from Trenton, New Jersey to St. Louis?

January is one of the best times of the year to fly to St. Louis from Trenton, New Jersey. Prices for January average $333 per person but you can even find prices for as low as $207. The most expensive prices can be found in the month of December. Opting for a January flight can save you 26% on your journey compared to booking in December

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.

$115+ Flights from Trenton, NJ to St. Louis

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Cheap flight deals from Trenton to St. Louis

Round-trip from	$292 (Mytrip)
One-way from	$115 (Flightnetwork)
Popular in	December
Cheapest in	January
Average price	$332

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 ($31 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 July 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 July 3, 2025.

Wed 7/98:30 amTTN - STL

1 stop16h 17mFrontier

Wed 7/235:40 pmSTL - TTN

1 stop29h 19mFrontier

Deal found 7/2

$281

Best flights from Trenton to St. Louis
Discover carefully curated flight deals from Trenton to St. Louis that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 3, 2025.

Wed 7/168:30 amTTN - STL

1 stop16h 17mFrontier

Sun 7/205:40 pmSTL - TTN

1 stop29h 19mFrontier

Deal found 7/1

$292

Last-minute flights from Trenton to St. Louis
Discover last-minute flight deals from Trenton to St. Louis. Data last updated July 3, 2025 and is based on user searches.

Wed 7/98:30 amTTN - STL

1 stop16h 17mFrontier

Wed 7/235:40 pmSTL - TTN

1 stop29h 19mFrontier

Deal found 7/2

$281

One-way flights from Trenton to St. Louis
Search for one-way flight options from Trenton to St. Louis. Find affordable one-way fares based on user searches. Data last updated July 3, 2025.

Thu 10/210:30 amTTN - STL

1 stop5h 34mFrontier

Deal found 7/2

$115

Cheapflights Fare Finder

Use the filters below to find and compare flights from Trenton to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 7/16

8:30 am-11:47 pm

1 stop16h 17m

Lambert-St Louis

Sun 7/20

5:40 pm-11:59 pm

1 stop29h 19m

$292

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 10/2

10:30 am-3:04 pm

1 stop5h 34m

$115

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/2

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.

What is the cheapest time of day to fly from TTN to STL?

When flying from Trenton, New Jersey to St. Louis, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Trenton to St. Louis, such as Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Frontier

5.9

Fair

3,286 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

TTN is a small airport for Frontier. Drop off is easy as is parking. The location is remote so there is zero traffic. The place could use a renovation but for the price you pay it is not necessary. Good-Staff is very friendly. Flight left on time. Bad- run down, deplaning/boarding on the tarmac. I got wet on the stairs outside of the plane while waiting to board.

Frontier

5.9

Fair

3,286 reviews

Frontier

5.9

Fair

3,286 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

Related info for your journey

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.

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$115+ 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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Trenton to St. Louis with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Trenton to St. Louis

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Trenton to St. Louis

Cheapest flights from Trenton to St. LouisExplore 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 July 3, 2025.

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 July 3, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Trenton to St. Louis that are best for you.

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.

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?

What is the cheapest time of day to fly from TTN to STL?

Find hourly flight availability from Trenton to St. Louis. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

Reviews of airlines servicing St. Louis

Read through reviews of airlines operating flights from Trenton to St. Louis, such as Frontier. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

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.

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

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

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

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

Traveling to a place near Trenton?

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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 July 3, 2025.