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Cheap flights from Buffalo to St. Louis from $87

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 1/15. 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
7:14 pm - 6:51 am
BUF
-
STL
12h 37m1 stop
Frontier Logo
8:32 pm - 6:19 pm
STL
-
BUF
20h 47m1 stop
$199Frontier
Thu, Jan 15 - Sat, Jan 17
Frontier Logo
7:14 pm - 6:51 am
BUF
-
STL
12h 37m1 stop
Frontier Logo
8:32 pm - 8:03 pm
STL
-
BUF
22h 31m2 stops
$229Frontier
Thu, Jan 15 - Sat, Jan 17
Delta Logo
2:56 pm - 8:06 pm
BUF
-
STL
6h 10m1 stop
Delta Logo
6:35 am - 11:27 am
STL
-
BUF
3h 52m1 stop
$280Delta
Tue, Jan 13 - Thu, Jan 15
Delta Logo
6:00 am - 12:33 pm
BUF
-
STL
7h 33m1 stop
Delta Logo
6:25 am - 2:10 pm
STL
-
BUF
6h 45m1 stop
$282Delta
Wed, Jan 14 - Thu, Jan 15
Southwest Logo
12:10 pm - 6:55 pm
BUF
-
STL
7h 45m1 stop
Southwest Logo
12:05 pm - 10:30 pm
STL
-
BUF
9h 25m2 stops
$287Southwest
Tue, Jan 13 - Thu, Jan 15
Southwest Logo
3:45 pm - 9:55 pm
BUF
-
STL
7h 10m2 stops
Southwest Logo
12:05 pm - 10:30 pm
STL
-
BUF
9h 25m2 stops
$292Southwest
Tue, Jan 13 - Thu, Jan 15
Frontier Logo
10:43 am - 10:33 pm
BUF
-
STL
12h 50m1 stop
Frontier Logo
10:40 am - 9:08 pm
STL
-
BUF
9h 28m1 stop
$293Frontier
Mon, Dec 22 - Mon, Dec 29
Delta Logo
5:44 pm - 8:43 pm
BUF
-
STL
3h 59m1 stop
Delta Logo
6:35 am - 11:43 am
STL
-
BUF
4h 08m1 stop
$295Delta
Wed, Feb 18 - Fri, Feb 20
United Airlines Logo
8:30 am - 2:30 pm
BUF
-
STL
7h 00m1 stop
United Airlines Logo
8:05 am - 1:24 pm
STL
-
BUF
4h 19m1 stop
$335United Airlines
Sun, Jan 18 - Thu, Jan 22
Southwest Logo
3:45 pm - 9:00 pm
BUF
-
STL
6h 15m2 stops
Southwest Logo
3:55 pm - 11:55 pm
STL
-
BUF
7h 00m1 stop
$337Southwest
Wed, Feb 18 - Fri, Feb 20

Frontier flights from Buffalo to St. Louis

Our best Frontier deals on Buffalo to St. Louis flight tickets
Frontier
Feb 6
BUF1:39 pmBuffalo
10h 54m
2 stops
STL11:33 pmLambert-St Louis
Feb 9
STL10:16 amLambert-St Louis
7h 20m
1 stop
BUF6:36 pmBuffalo
$171
Find similar
Frontier
Feb 6
BUF1:39 pmBuffalo
18h 12m
1 stop
STL6:51 amLambert-St Louis
Feb 9
STL10:16 amLambert-St Louis
7h 20m
1 stop
BUF6:36 pmBuffalo
$180
Find similar
Frontier
Jan 15
BUF7:14 pmBuffalo
12h 37m
1 stop
STL6:51 amLambert-St Louis
Jan 17
STL8:32 pmLambert-St Louis
20h 47m
1 stop
BUF6:19 pmBuffalo
$199
Find similar

United Airlines flights from Buffalo to St. Louis

Our best United Airlines deals on Buffalo to St. Louis flight tickets
United Airlines
Jan 18
BUF8:30 amBuffalo
7h 00m
1 stop
STL2:30 pmLambert-St Louis
Jan 22
STL8:05 amLambert-St Louis
4h 19m
1 stop
BUF1:24 pmBuffalo
$335
Find similar
United Airlines
Feb 6
BUF8:30 amBuffalo
7h 00m
1 stop
STL2:30 pmLambert-St Louis
Feb 9
STL3:11 pmLambert-St Louis
4h 18m
1 stop
BUF8:29 pmBuffalo
$337
Find similar
United Airlines
Jan 18
BUF8:30 amBuffalo
4h 59m
1 stop
STL12:29 pmLambert-St Louis
Jan 22
STL8:05 amLambert-St Louis
10h 20m
2 stops
BUF7:25 pmBuffalo
$340
Find similar

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 December 9, 2025.
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

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Thu 1/15

7:14 pm-6:51 am

1 stop12h 37m

Lambert-St Louis

Sat 1/17

8:32 pm-6:19 pm

1 stop20h 47m

$199

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Thu 1/15

7:14 pm-6:51 am

1 stop12h 37m

Lambert-St Louis

Sat 1/17

8:32 pm-8:03 pm

2 stops22h 31m

$229

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 1/13

2:56 pm-8:06 pm

1 stop6h 10m

Lambert-St Louis

Thu 1/15

6:35 am-11:27 am

1 stop3h 52m

$280

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Wed 1/14

6:00 am-12:33 pm

1 stop7h 33m

Lambert-St Louis

Thu 1/15

6:25 am-2:10 pm

1 stop6h 45m

$282

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 1/13

12:10 pm-6:55 pm

1 stop7h 45m

Lambert-St Louis

Thu 1/15

12:05 pm-10:30 pm

2 stops9h 25m

$287

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Tue 1/13

3:45 pm-9:55 pm

2 stops7h 10m

Lambert-St Louis

Thu 1/15

12:05 pm-10:30 pm

2 stops9h 25m

$292

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Mon 12/22

10:43 am-10:33 pm

1 stop12h 50m

Lambert-St Louis

Mon 12/29

10:40 am-9:08 pm

1 stop9h 28m

$293

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Wed 2/18

5:44 pm-8:43 pm

1 stop3h 59m

Lambert-St Louis

Fri 2/20

6:35 am-11:43 am

1 stop4h 08m

$295

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sun 1/18

8:30 am-2:30 pm

1 stop7h 00m

Lambert-St Louis

Thu 1/22

8:05 am-1:24 pm

1 stop4h 19m

$335

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Wed 2/18

3:45 pm-9:00 pm

2 stops6h 15m

Lambert-St Louis

Fri 2/20

3:55 pm-11:55 pm

1 stop7h 00m

$337

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 $304. The month of July is another great option to travel to St. Louis, with average flight prices from Buffalo averaging around $312.

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 $326. 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 Monday because tickets tend to average around $486. 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 Buffalo at noon is the least expensive time of day to depart. momondo users have found prices as low as $328 when looking at flights departing at noon. In the evening is when there is more demand to fly to St. Louis, so prices are often more expensive at around $416 per ticket.

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

As of December 2025, prices for Buffalo to St. Louis flights are approximately 55% cheaper when compared to flights at the same time last year.

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 59m

Direct flights

None
The fastest flight from Buffalo to St. Louis takes 3h 59m
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 49m, 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
8,011 reviews
Search Delta flights
American AirlinesPriceFrom $243Free CancellationRating
7.2
11,045 reviews
Search American Airlines flights
United AirlinesPriceFrom $296Free CancellationRating
7.4
9,089 reviews
Search United Airlines flights
SouthwestPriceFrom $338Free CancellationRating
8.0
4,254 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
Maryland Heights
O'Fallon
Florissant
Fenton
Wentzville
St. Peters
Collinsville
Alton
Farmington
Festus
Clayton
Glencoe
Edwardsville
Eureka
Litchfield
Shrewsbury

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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