In terms of precipitation, rainfall in Trenton, New Jersey ranges from 2.9 - 4.8 inches per month. July is typically the wettest month, when rainfall can reach 4.8 in. February is typically the driest time to visit Trenton, New Jersey when rainfall is around 2.9 in.

If weather is an important factor for your trip to Trenton, New Jersey, 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 75.2 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 St. Louis to Trenton, New Jersey?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 45 days in advance, which can save you up to 60% on flights from St. Louis to Trenton, New Jersey compared to booking the week you need them. Waiting 45 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $341. For sooner than that we have options available in the next 3 days from $371.

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

Flights from St. Louis to Trenton, New Jersey lean towards being more expensive in November. Prices are generally better when you fly from St. Louis to Trenton, New Jersey in April, with the cheapest ticket starting at $89.

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

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from St. Louis to Trenton, New Jersey as you normally would.

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

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

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

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

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

Yes. Cheapflights offers flight deals from St. Louis to Trenton by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$99+ Flights from St. Louis to Trenton, NJ

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Cheap flight deals from St. Louis to Trenton

Round-trip from	$205 (FlightHub)
One-way from	$99 (Frontier)
Popular in	November
Cheapest in	April
Average price	$311

From Lambert-St Louis to Trenton-Mercer

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One-way flight from Lambert-St Louis to Trenton-Mercer

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Highest demand for flights based on searches. 11% potential increase in price ($37 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 July 2025

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Find flight deals from St. Louis to Trenton

Cheapest flights from St. Louis to Trenton
Explore the most affordable flight options available from St. Louis to Trenton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Tue 8/55:40 pmSTL - TTN

1 stop29h 19mFrontier

Tue 8/125:15 pmTTN - STL

1 stop7h 32mFrontier

Deal found 7/28

$205

Best flights from St. Louis to Trenton
Discover carefully curated flight deals from St. Louis to Trenton that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated July 29, 2025.

Tue 8/55:40 pmSTL - TTN

1 stop29h 19mFrontier

Tue 8/125:15 pmTTN - STL

1 stop7h 32mFrontier

Deal found 7/28

$205

Last-minute flights from St. Louis to Trenton
Discover last-minute flight deals from St. Louis to Trenton. Data last updated July 29, 2025 and is based on user searches.

Tue 8/55:40 pmSTL - TTN

1 stop29h 19mFrontier

Tue 8/125:15 pmTTN - STL

1 stop7h 32mFrontier

Deal found 7/28

$205

One-way flights from St. Louis to Trenton
Search for one-way flight options from St. Louis to Trenton. Find affordable one-way fares based on user searches. Data last updated July 29, 2025.

Sat 10/112:22 pmSTL - TTN

1 stop8h 25mFrontier

Deal found 7/27

$99

Fly from

Fly to

Route

Depart

Return

Price

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Tue 8/5

5:40 pm-11:59 pm

1 stop29h 19m

Trenton-Mercer

Tue 8/12

5:15 pm-11:47 pm

1 stop7h 32m

$205

St. LouisTrenton

STL - TTN

STLTTN

Lambert-St Louis

Sat 10/11

2:22 pm-11:47 pm

1 stop8h 25m

$99

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/27

Best time to book a flight from St. Louis to Trenton

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

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

Currently, January is the cheapest month in which you can book a flight from St. Louis to Trenton, New Jersey (average of $73). Flying from St. Louis to Trenton, New Jersey in June is currently the most expensive (average of $153). 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.

Reviews of airlines servicing Trenton

Peruse reviews from past customers who have flown with Frontier from St. Louis to Trenton to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Frontier

5.9

Fair

3,238 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

3,238 reviews

Frontier

5.9

Fair

3,238 reviews

Reviews

1 / 20

8.0

Excellent

Anonymous,Jun 2025

TTN - TPA

Related info for your journey

Can I find deals for flights from St. Louis to Trenton that include hotel bookings?
Yes. In addition to deals on St. Louis to Trenton flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Trenton?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Trenton.
Can I find deals for business class flights from St. Louis to Trenton?
Yes. Cheapflights offers flight deals from St. Louis to Trenton 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 St. Louis to Trenton, New Jersey?
Currently, January is the cheapest month in which you can book a flight from St. Louis to Trenton, New Jersey (average of $73). Flying from St. Louis to Trenton, New Jersey in June is currently the most expensive (average of $153). 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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$99+ Cheap flights from St. Louis to Trenton, NJ (STL - TTN)

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 10/11. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Trenton with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Trenton

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from St. Louis to Trenton

Cheapest flights from St. Louis to TrentonExplore the most affordable flight options available from St. Louis to Trenton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Explore the most affordable flight options available from St. Louis to Trenton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.

Cheapflights Fare Finder

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

Best time to book a flight from St. Louis to Trenton

Have a flexible travel schedule? Discover the best time to fly to Trenton from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Trenton

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

Reviews of airlines servicing Trenton

Peruse reviews from past customers who have flown with Frontier from St. Louis to Trenton to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Trenton. 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 St. Louis to Trenton that include hotel bookings?

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

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Trenton

See prices for flight routes from nearby airports that may be better suited for you.

100% Free

Book with Flexibility

Travel Smart

Cheapest flights from St. Louis to Trenton
Explore the most affordable flight options available from St. Louis to Trenton. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 29, 2025.