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Cheap flights from Buffalo to St. Louis from $90

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Buffalo to St. Louis departing on 4/13. 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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Find the cheapest flights from Buffalo to St. Louis

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
1:56 pm - 6:50 am
BUF
-
STL
17h 54m
1 stop
Frontier Logo
8:23 pm - 11:40 am
STL
-
BUF
14h 17m
1 stop
$248Frontier
Tue, Apr 14 - Wed, Apr 15
Frontier Logo
11:19 am - 11:19 pm
BUF
-
STL
13h 00m
1 stop
Frontier Logo
4:59 pm - 7:26 pm
STL
-
BUF
25h 27m
1 stop
$257Frontier
Mon, Apr 20 - Wed, Apr 22
Multiple Airlines Logo
1:08 pm - 6:50 am
BUF
-
STL
18h 42m
1 stop
Multiple Airlines Logo
6:55 pm - 6:46 pm
STL
-
BUF
22h 51m
2 stops
$265Multiple Airlines
Thu, Apr 30 - Thu, May 7
Frontier Logo
1:02 pm - 11:25 pm
BUF
-
STL
11h 23m
2 stops
Frontier Logo
8:23 pm - 12:42 pm
STL
-
BUF
15h 19m
1 stop
$267Frontier
Tue, Apr 7 - Mon, Apr 27
Frontier Logo
8:16 pm - 6:50 am
BUF
-
STL
35h 34m
2 stops
Frontier Logo
8:23 pm - 12:42 pm
STL
-
BUF
15h 19m
1 stop
$279Frontier
Mon, Apr 13 - Mon, Apr 20
Frontier Logo
3:00 pm - 11:25 pm
BUF
-
STL
9h 25m
1 stop
Frontier Logo
4:59 pm - 7:13 pm
STL
-
BUF
25h 14m
1 stop
$291Frontier
Mon, Apr 13 - Wed, Apr 15
Frontier Logo
8:16 pm - 11:19 pm
BUF
-
STL
28h 03m
1 stop
Frontier Logo
8:23 pm - 12:42 pm
STL
-
BUF
15h 19m
1 stop
$298Frontier
Mon, Apr 13 - Mon, Apr 20
Frontier Logo
12:42 pm - 11:25 pm
BUF
-
STL
11h 43m
2 stops
Frontier Logo
8:23 pm - 11:40 am
STL
-
BUF
14h 17m
1 stop
$299Frontier
Mon, Apr 13 - Wed, Apr 15
Southwest Logo
4:00 pm - 10:10 pm
BUF
-
STL
7h 10m
2 stops
Southwest Logo
5:35 am - 10:20 am
STL
-
BUF
3h 45m
1 stop
$302Southwest
Tue, Apr 14 - Wed, Apr 15
Southwest Logo
4:00 pm - 11:15 pm
BUF
-
STL
8h 15m
2 stops
Southwest Logo
5:35 am - 10:20 am
STL
-
BUF
3h 45m
1 stop
$304Southwest
Mon, Apr 20 - Wed, Apr 22

Frontier flights from Buffalo to St. Louis

Our best Frontier deals on Buffalo to St. Louis flight tickets
Frontier
Apr 14
BUF1:56 pmBuffalo
17h 54m
1 stop
STL6:50 amLambert-St Louis
Apr 15
STL8:23 pmLambert-St Louis
14h 17m
1 stop
BUF11:40 amBuffalo
$248
Frontier
Apr 20
BUF11:19 amBuffalo
13h 00m
1 stop
STL11:19 pmLambert-St Louis
Apr 22
STL4:59 pmLambert-St Louis
25h 27m
1 stop
BUF7:26 pmBuffalo
$257
Frontier
Mar 21
BUF7:36 pmBuffalo
25h 34m
1 stop
STL8:10 pmLambert-St Louis
Mar 25
STL4:51 pmLambert-St Louis
16h 58m
1 stop
BUF10:49 amBuffalo
$261

Southwest flights from Buffalo to St. Louis

Our best Southwest deals on Buffalo to St. Louis flight tickets
Southwest
Apr 14
BUF4:00 pmBuffalo
7h 10m
2 stops
STL10:10 pmLambert-St Louis
Apr 15
STL5:35 amLambert-St Louis
3h 45m
1 stop
BUF10:20 amBuffalo
$302
Southwest
Apr 20
BUF4:00 pmBuffalo
7h 45m
2 stops
STL10:45 pmLambert-St Louis
Apr 22
STL5:35 amLambert-St Louis
3h 45m
1 stop
BUF10:20 amBuffalo
$304
Southwest
Jun 2
BUF11:00 amBuffalo
9h 15m
2 stops
STL7:15 pmLambert-St Louis
Jun 4
STL4:35 pmLambert-St Louis
6h 35m
2 stops
BUF12:10 amBuffalo
$309

momondo Fare Finder

 
Customize your flight search to find flights from Buffalo 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 March 20, 2026.
Use the filters below to find and compare flights from Buffalo to St. Louis that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 4/14

1:56 pm-6:50 am

1 stop17h 54m

Lambert-St Louis

Wed 4/15

8:23 pm-11:40 am

1 stop14h 17m

$248

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/20

11:19 am-11:19 pm

1 stop13h 00m

Lambert-St Louis

Wed 4/22

4:59 pm-7:26 pm

1 stop25h 27m

$257

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Thu 4/30

1:08 pm-6:50 am

1 stop18h 42m

Lambert-St Louis

Thu 5/7

6:55 pm-6:46 pm

2 stops22h 51m

$265

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 4/7

1:02 pm-11:25 pm

2 stops11h 23m

Lambert-St Louis

Mon 4/27

8:23 pm-12:42 pm

1 stop15h 19m

$267

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/13

8:16 pm-6:50 am

2 stops35h 34m

Lambert-St Louis

Mon 4/20

8:23 pm-12:42 pm

1 stop15h 19m

$279

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/13

3:00 pm-11:25 pm

1 stop9h 25m

Lambert-St Louis

Wed 4/15

4:59 pm-7:13 pm

1 stop25h 14m

$291

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/13

8:16 pm-11:19 pm

1 stop28h 03m

Lambert-St Louis

Mon 4/20

8:23 pm-12:42 pm

1 stop15h 19m

$298

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/13

12:42 pm-11:25 pm

2 stops11h 43m

Lambert-St Louis

Wed 4/15

8:23 pm-11:40 am

1 stop14h 17m

$299
Quickest round-trip

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 4/14

4:00 pm-10:10 pm

2 stops7h 10m

Lambert-St Louis

Wed 4/15

5:35 am-10:20 am

1 stop3h 45m

$302

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 4/20

4:00 pm-11:15 pm

2 stops8h 15m

Lambert-St Louis

Wed 4/22

5:35 am-10:20 am

1 stop3h 45m

$304

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 Buffalo 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, September is the cheapest month to fly from Buffalo to St. Louis. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $316. The month of December is another great option to travel to St. Louis, with average flight prices from Buffalo averaging around $319.

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

When to book flights from Buffalo to St. Louis

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

Cheap Buffalo to St. Louis (BUF to STL) flight deals and tips

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

Fastest flight time

3h 45m

Direct flights

None
The fastest flight from Buffalo to St. Louis takes 3h 45m
There are no direct flights from Buffalo to St. Louis. There are no popular flight routes from Buffalo to St. Louis.
Search flight deals

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

    A flight from Buffalo to Lambert-St Louis will travel around 660.3 mi. Flights usually cover this in 3h 45m, depending on flying conditions and air traffic around both airports.

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

    Prices for flights from Buffalo Airport to Lambert-St Louis Airport were last updated today.

  • How many operators does momondo search for flights from Buffalo Airport to Lambert-St Louis Airport?

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Buffalo Airport to Lambert-St Louis Airport.

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

    The required travel and health documents for your Lambert-St Louis Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Lambert-St Louis Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

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

Best airlines flying from Buffalo to St. Louis

Compare and see reviews for airlines that fly from Buffalo to St. Louis with momondo
Airline
Rating
Free Cancellation
Price
DeltaPriceFrom $164Free CancellationRating
7.9
8,303 reviews
Search Delta flights
American AirlinesPriceFrom $236Free CancellationRating
7.1
11,481 reviews
Search American Airlines flights
SouthwestPriceFrom $317Free CancellationRating
8.0
4,324 reviews
Search Southwest 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
Collinsville
Alton
St. Peters
Wentzville
Fenton
Farmington
Clayton
Edwardsville
Festus
Eureka
Litchfield
Shrewsbury
Grafton

Why use momondo?

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

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

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

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

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

Once all potential Buffalo to St. Louis flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Buffalo 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 Buffalo and alert you when they change.

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