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Cheap flights from Trenton, New Jersey to St. Louis from $110

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Trenton, New Jersey to St. Louis departing on 8/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Find the cheapest flights from Trenton, New Jersey to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:25 am - 11:59 pm
TTN
-
STL
18h 34m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$210Frontier
Wed, Aug 5 - Tue, Aug 11
Frontier Logo
9:23 am - 11:59 pm
TTN
-
STL
15h 36m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$220Frontier
Tue, Jul 28 - Tue, Aug 4
Frontier Logo
11:15 am - 11:59 pm
TTN
-
STL
13h 44m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$234Frontier
Sat, Aug 8 - Wed, Aug 12
Frontier Logo
9:23 am - 11:59 pm
TTN
-
STL
15h 36m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$239Frontier
Thu, Jul 30 - Tue, Aug 4
Frontier Logo
6:05 am - 11:59 pm
TTN
-
STL
18h 54m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$240Frontier
Sat, Jul 25 - Tue, Jul 28
Frontier Logo
6:05 am - 11:59 pm
TTN
-
STL
18h 54m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$241Frontier
Mon, Aug 10 - Wed, Aug 12
Frontier Logo
9:23 am - 11:59 pm
TTN
-
STL
15h 36m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$244Frontier
Sat, Jul 25 - Tue, Jul 28
Frontier Logo
6:25 am - 11:59 pm
TTN
-
STL
18h 34m
1 stop
Frontier Logo
4:09 pm - 8:38 am
STL
-
TTN
15h 29m
1 stop
$249Frontier
Wed, Jul 22 - Mon, Jul 27
Frontier Logo
6:05 am - 11:59 pm
TTN
-
STL
18h 54m
1 stop
Frontier Logo
4:09 pm - 8:38 am
STL
-
TTN
15h 29m
1 stop
$250Frontier
Tue, Jul 21 - Fri, Jul 24
Frontier Logo
9:23 am - 11:59 pm
TTN
-
STL
15h 36m
1 stop
Frontier Logo
4:09 pm - 11:40 pm
STL
-
TTN
6h 31m
1 stop
$255Frontier
Tue, Jul 21 - Thu, Jul 23

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Frontier flights from Trenton, New Jersey to St. Louis

Our best Frontier deals on Trenton, New Jersey to St. Louis flight tickets
Frontier
Aug 5
TTN6:25 amTrenton-Mercer
18h 34m
1 stop
STL11:59 pmLambert-St Louis
Aug 11
STL4:09 pmLambert-St Louis
6h 31m
1 stop
TTN11:40 pmTrenton-Mercer
$210
Frontier
Jul 28
TTN9:23 amTrenton-Mercer
15h 36m
1 stop
STL11:59 pmLambert-St Louis
Aug 4
STL4:09 pmLambert-St Louis
6h 31m
1 stop
TTN11:40 pmTrenton-Mercer
$220
Frontier
Aug 8
TTN11:15 amTrenton-Mercer
13h 44m
1 stop
STL11:59 pmLambert-St Louis
Aug 12
STL4:09 pmLambert-St Louis
6h 31m
1 stop
TTN11:40 pmTrenton-Mercer
$234

momondo Fare Finder

 
Customize your flight search to find flights from Trenton, New Jersey 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, momondo users made 832,500 searches. Data last updated July 2, 2026.
Use the filters below to find and compare flights from Trenton, New Jersey to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 8/5

6:25 am-11:59 pm

1 stop18h 34m

Lambert-St Louis

Tue 8/11

4:09 pm-11:40 pm

1 stop6h 31m

$210

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 7/28

9:23 am-11:59 pm

1 stop15h 36m

Lambert-St Louis

Tue 8/4

4:09 pm-11:40 pm

1 stop6h 31m

$220
Quickest round-trip

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 8/8

11:15 am-11:59 pm

1 stop13h 44m

Lambert-St Louis

Wed 8/12

4:09 pm-11:40 pm

1 stop6h 31m

$234

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Thu 7/30

9:23 am-11:59 pm

1 stop15h 36m

Lambert-St Louis

Tue 8/4

4:09 pm-11:40 pm

1 stop6h 31m

$239

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 7/25

6:05 am-11:59 pm

1 stop18h 54m

Lambert-St Louis

Tue 7/28

4:09 pm-11:40 pm

1 stop6h 31m

$240

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Mon 8/10

6:05 am-11:59 pm

1 stop18h 54m

Lambert-St Louis

Wed 8/12

4:09 pm-11:40 pm

1 stop6h 31m

$241

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Sat 7/25

9:23 am-11:59 pm

1 stop15h 36m

Lambert-St Louis

Tue 7/28

4:09 pm-11:40 pm

1 stop6h 31m

$244

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Wed 7/22

6:25 am-11:59 pm

1 stop18h 34m

Lambert-St Louis

Mon 7/27

4:09 pm-8:38 am

1 stop15h 29m

$249

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 7/21

6:05 am-11:59 pm

1 stop18h 54m

Lambert-St Louis

Fri 7/24

4:09 pm-8:38 am

1 stop15h 29m

$250

TrentonSt. Louis

TTN - STL

TTNSTL

Trenton-Mercer

Tue 7/21

9:23 am-11:59 pm

1 stop15h 36m

Lambert-St Louis

Thu 7/23

4:09 pm-11:40 pm

1 stop6h 31m

$255

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to St. Louis from

How to get the cheapest flight ticket from Trenton, New Jersey to St. Louis

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to St. Louis?

The cheapest day to depart on your flight to St. Louis is on a Wednesday when prices can be found for as low as $370. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Sunday because tickets tend to average around $484. These prices are subject to change though, so be sure to set up a Price Alert for flights to St. Louis.

What is the cheapest time of day to depart on your flight to St. Louis?

Flying to St. Louis from Trenton, New Jersey in the evening is the least expensive time of day to depart. momondo users have found prices as low as $382 when looking at flights departing in the evening. At noon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $414 per ticket.

When to book flights from Trenton, New Jersey to St. Louis

Are you open to changing your travel dates? Check out the ideal times to fly from Trenton, New Jersey to St. Louis according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Trenton, New Jersey to St. Louis (TTN to STL) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Trenton, New Jersey to St. Louis

Fastest flight time

13h 44m

Direct flights

None
The fastest flight from Trenton, New Jersey to St. Louis takes 13h 44m
There are no direct flights from Trenton, New Jersey to St. Louis. There are no popular flight routes from Trenton, New Jersey to St. Louis.
Search flight deals

Frequently asked questions about flying from Trenton, New Jersey to St. Louis

  • How far is Trenton-Mercer to Lambert-St Louis by plane?

    There are 829.7 mi between Trenton-Mercer and Lambert-St Louis. 13h 44m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Trenton-Mercer Airport to Lambert-St Louis Airport?

    Prices for flights from Trenton-Mercer Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How old do you have to be to fly from Trenton-Mercer Airport to Lambert-St Louis Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Trenton-Mercer Airport to Lambert-St Louis Airport.

  • What documentation or ID do you need to fly to Lambert-St Louis Airport?

    The necessary travel and health documents for your Lambert-St Louis Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near St. Louis?

Book flights to St. Louis if you plan to visit one of these locations
St. Charles
Chesterfield
Fairview Heights
Hermann
Maryland Heights
Florissant
O'Fallon
St. Peters
Collinsville
Alton
Fenton
Farmington
Wentzville
Clayton
Festus
Eureka
Litchfield
Edwardsville
Grafton
Shrewsbury

Why use momondo?

Why should I use momondo to find a flight deal from Trenton to St. Louis?

momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Trenton to St. Louis. Millions of users trust and use momondo every year so you are in good hands.

Can I find flights from Trenton to St. Louis with flexible booking policies on momondo?

All flight searches from Trenton to St. Louis on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Trenton to St. Louis?

momondo helps you find the best flight between Trenton and St. Louis by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

I’m not ready to book a flight from Trenton to St. Louis right now. Can momondo alert me if prices change?

If you are simply researching potential flights to St. Louis, momondo offers a useful price alert feature which will track prices for flights to St. Louis from Trenton and alert you when they change.

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