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Cheap flights from Cincinnati to St. Louis from $55

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Cincinnati to St. Louis departing on 1/7. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Cheap round-trip flights

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Frontier Logo
11:57 am - 10:33 pmCVG-STL
11h 36m1 stop
Frontier Logo
9:54 am - 7:45 pmSTL-CVG
8h 51m1 stop
$110Frontier
Find Deal
Sat, Dec 6 - Mon, Dec 8
Frontier Logo
10:24 am - 9:07 amCVG-STL
23h 43m1 stop
Frontier Logo
4:13 pm - 11:02 pmSTL-CVG
5h 49m1 stop
$119Frontier
Find Deal
Tue, Nov 18 - Thu, Nov 20
Frontier Logo
11:57 am - 10:33 pmCVG-STL
11h 36m1 stop
Frontier Logo
1:16 pm - 11:58 pmSTL-CVG
9h 42m1 stop
$150Frontier
Find Deal
Mon, Dec 8 - Thu, Dec 11
Delta Logo
9:45 am - 2:49 pmCVG-STL
6h 04m1 stop
Delta Logo
6:00 am - 11:17 amSTL-CVG
4h 17m1 stop
$257Delta
Find Deal
Sat, Jan 17 - Sat, Jan 24
American Airlines Logo
5:11 pm - 11:26 pmCVG-STL
7h 15m1 stop
American Airlines Logo
1:40 pm - 11:45 pmSTL-CVG
9h 05m2 stops
$262American Airlines
Find Deal
Sat, Jan 17 - Sat, Jan 24
Southwest Logo
5:50 am - 1:40 pmCVG-STL
8h 50m2 stops
Southwest Logo
12:45 pm - 10:30 pmSTL-CVG
8h 45m2 stops
$267Southwest
Find Deal
Wed, Dec 3 - Wed, Dec 10
United Airlines Logo
5:55 pm - 10:58 pmCVG-STL
6h 03m1 stop
United Airlines Logo
11:20 am - 4:43 pmSTL-CVG
4h 23m1 stop
$292United Airlines
Find Deal
Wed, Jan 21 - Sun, Jan 25
American Airlines Logo
6:06 pm - 9:28 pmCVG-STL
4h 22m1 stop
American Airlines Logo
5:15 am - 2:50 pmSTL-CVG
8h 35m1 stop
$294American Airlines
Find Deal
Thu, Dec 4 - Sun, Dec 7
Southwest Logo
7:00 am - 12:45 pmCVG-STL
6h 45m2 stops
Southwest Logo
12:05 pm - 4:10 pmSTL-CVG
3h 05m1 stop
$297Southwest
Find Deal
Wed, Jan 21 - Sun, Jan 25
Delta Logo
2:19 pm - 5:43 pmCVG-STL
4h 24m1 stop
Delta Logo
6:35 am - 1:26 pmSTL-CVG
5h 51m1 stop
$309Delta
Find Deal
Thu, Feb 26 - Sun, Mar 1

Frontier flights from Cincinnati to St. Louis

Our best Frontier deals on Cincinnati to St. Louis flight tickets
Frontier
Dec 6
CVG11:57 amCincinnati Cinci./N. Kentucky
11h 36m
1 stop
STL10:33 pmLambert-St Louis
Dec 8
STL9:54 amLambert-St Louis
8h 51m
1 stop
CVG7:45 pmCincinnati Cinci./N. Kentucky
$110
Find similar
Frontier
Nov 18
CVG10:24 amCincinnati Cinci./N. Kentucky
23h 43m
1 stop
STL9:07 amLambert-St Louis
Nov 20
STL4:13 pmLambert-St Louis
5h 49m
1 stop
CVG11:02 pmCincinnati Cinci./N. Kentucky
$119
Find similar
Frontier
Dec 8
CVG11:57 amCincinnati Cinci./N. Kentucky
11h 36m
1 stop
STL10:33 pmLambert-St Louis
Dec 11
STL1:16 pmLambert-St Louis
9h 42m
1 stop
CVG11:58 pmCincinnati Cinci./N. Kentucky
$150
Find similar

Delta flights from Cincinnati to St. Louis

Our best Delta deals on Cincinnati to St. Louis flight tickets
Delta
Jan 17
CVG9:45 amCincinnati Cinci./N. Kentucky
6h 04m
1 stop
STL2:49 pmLambert-St Louis
Jan 24
STL6:00 amLambert-St Louis
4h 17m
1 stop
CVG11:17 amCincinnati Cinci./N. Kentucky
$257
Find similar
Delta
Feb 26
CVG2:19 pmCincinnati Cinci./N. Kentucky
4h 24m
1 stop
STL5:43 pmLambert-St Louis
Mar 1
STL6:35 amLambert-St Louis
5h 51m
1 stop
CVG1:26 pmCincinnati Cinci./N. Kentucky
$309
Find similar
Delta
Feb 26
CVG5:45 pmCincinnati Cinci./N. Kentucky
4h 00m
1 stop
STL8:45 pmLambert-St Louis
Mar 1
STL6:35 amLambert-St Louis
5h 51m
1 stop
CVG1:26 pmCincinnati Cinci./N. Kentucky
$342
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Cincinnati 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 November 5, 2025.
Use the filters below to find and compare flights from Cincinnati to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Sat 12/6

11:57 am-10:33 pm

1 stop11h 36m

Lambert-St Louis

Mon 12/8

9:54 am-7:45 pm

1 stop8h 51m

$110

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Tue 11/18

10:24 am-9:07 am

1 stop23h 43m

Lambert-St Louis

Thu 11/20

4:13 pm-11:02 pm

1 stop5h 49m

$119

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Mon 12/8

11:57 am-10:33 pm

1 stop11h 36m

Lambert-St Louis

Thu 12/11

1:16 pm-11:58 pm

1 stop9h 42m

$150

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Sat 1/17

9:45 am-2:49 pm

1 stop6h 04m

Lambert-St Louis

Sat 1/24

6:00 am-11:17 am

1 stop4h 17m

$257

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Sat 1/17

5:11 pm-11:26 pm

1 stop7h 15m

Lambert-St Louis

Sat 1/24

1:40 pm-11:45 pm

2 stops9h 05m

$262

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Wed 12/3

5:50 am-1:40 pm

2 stops8h 50m

Lambert-St Louis

Wed 12/10

12:45 pm-10:30 pm

2 stops8h 45m

$267

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Wed 1/21

5:55 pm-10:58 pm

1 stop6h 03m

Lambert-St Louis

Sun 1/25

11:20 am-4:43 pm

1 stop4h 23m

$292

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Thu 12/4

6:06 pm-9:28 pm

1 stop4h 22m

Lambert-St Louis

Sun 12/7

5:15 am-2:50 pm

1 stop8h 35m

$294

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Wed 1/21

7:00 am-12:45 pm

2 stops6h 45m

Lambert-St Louis

Sun 1/25

12:05 pm-4:10 pm

1 stop3h 05m

$297

CincinnatiSt. Louis

CVG - STL

CVGSTL

Cincinnati Cinci./N. Kentucky

Thu 2/26

2:19 pm-5:43 pm

1 stop4h 24m

Lambert-St Louis

Sun 3/1

6:35 am-1:26 pm

1 stop5h 51m

$309

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 Cincinnati 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 month to fly to St. Louis?

In general, August is the cheapest month to fly from Cincinnati to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $236. The month of January is another great option to travel to St. Louis, with average flight prices from Cincinnati averaging around $301.

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 $296. 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 Saturday because tickets tend to average around $429. 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 Cincinnati in the evening is the least expensive time of day to depart. momondo users have found prices as low as $308 when looking at flights departing in the evening. In the afternoon is when there is more demand to fly to St. Louis, so prices are often more expensive at around $426 per ticket.

How have Cincinnati to St. Louis flight prices changed over time?

As of November 2025, prices for Cincinnati to St. Louis flights are approximately 53% more expensive when compared to flights at the same time last year.

When to book flights from Cincinnati to St. Louis

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

Cheap Cincinnati to St. Louis (CVG to STL) flight deals and tips

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

Direct flights

None
There are no direct flights from Cincinnati to St. Louis. There are no popular flight routes from Cincinnati to St. Louis.
Search flight deals

  • How far is Cincinnati Cinci./N. Kentucky to Lambert-St Louis by plane?

    A flight from Cincinnati Cinci./N. Kentucky to Lambert-St Louis will travel around 307.3 mi. Flights usually cover this in 3h 05m, depending on flying conditions and air traffic around both airports.

  • When did momondo last update prices for flights from Cincinnati Cinci./N. Kentucky Airport to Lambert-St Louis Airport?

    Prices for flights from Cincinnati Cinci./N. Kentucky Airport to Lambert-St Louis Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Cincinnati Cinci./N. Kentucky Airport to Lambert-St Louis Airport?

  • How old do you have to be to fly from Cincinnati Cinci./N. Kentucky 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 Cincinnati Cinci./N. Kentucky 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.

  • What is the most popular airline from Cincinnati to St. Louis?

Best airlines flying from Cincinnati to St. Louis

Compare and see reviews for airlines that fly from Cincinnati to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $85Free CancellationRating
5.8
3,116 reviews
Search Frontier flights
American AirlinesPriceFrom $218Free CancellationRating
7.2
11,042 reviews
Search American Airlines flights
DeltaPriceFrom $236Free CancellationRating
7.9
8,004 reviews
Search Delta flights
SouthwestPriceFrom $254Free CancellationRating
8.0
4,240 reviews
Search Southwest flights
United AirlinesPriceFrom $262Free CancellationRating
7.4
9,002 reviews
Search United Airlines flights

Traveling to a place near St. Louis?

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

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Cincinnati to St. Louis for you.

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

Yes. All flights to St. Louis from Cincinnati on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Cincinnati to St. Louis.

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

Of course. momondo tracks the price of Cincinnati to St. Louis flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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