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Cheap flights from Buffalo to St. Louis from $100

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 1/19. 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
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
10:26 am - 4:05 pm
BUF
-
STL
6h 39m1 stop
Frontier Logo
5:42 pm - 7:04 pm
STL
-
BUF
24h 22m1 stop
$146Frontier
Mon, Jan 12 - Wed, Jan 21
Frontier Logo
7:31 pm - 11:11 am
BUF
-
STL
16h 40m1 stop
Frontier Logo
8:22 pm - 12:44 pm
STL
-
BUF
15h 22m1 stop
$193Frontier
Fri, Jan 30 - Wed, Feb 4
Delta Logo
6:03 am - 9:39 am
BUF
-
STL
4h 36m1 stop
Delta Logo
9:59 am - 5:54 pm
STL
-
BUF
6h 55m1 stop
$223Delta
Sun, Jan 18 - Tue, Jan 20
Frontier Logo
7:31 pm - 11:11 am
BUF
-
STL
16h 40m1 stop
Frontier Logo
8:22 pm - 7:04 pm
STL
-
BUF
21h 42m2 stops
$235Frontier
Fri, Jan 30 - Wed, Feb 4
American Airlines Logo
5:16 am - 9:24 am
BUF
-
STL
5h 08m1 stop
American Airlines Logo
10:17 am - 5:49 pm
STL
-
BUF
6h 32m1 stop
$239American Airlines
Sat, Jan 17 - Sat, Jan 24
American Airlines Logo
8:00 am - 3:04 pm
BUF
-
STL
8h 04m2 stops
American Airlines Logo
6:52 am - 12:08 pm
STL
-
BUF
4h 16m1 stop
$251American Airlines
Sun, Jan 18 - Tue, Jan 20
United Airlines Logo
8:30 am - 12:29 pm
BUF
-
STL
4h 59m1 stop
United Airlines Logo
8:30 am - 2:14 pm
STL
-
BUF
4h 44m1 stop
$282United Airlines
Thu, Jan 29 - Tue, Feb 3
American Airlines Logo
8:00 am - 3:04 pm
BUF
-
STL
8h 04m2 stops
American Airlines Logo
6:52 am - 12:08 pm
STL
-
BUF
4h 16m1 stop
$284American Airlines
Sun, Jan 18 - Tue, Jan 20
Frontier Logo
8:06 pm - 9:11 am
BUF
-
STL
14h 05m1 stop
Frontier Logo
8:22 pm - 6:36 pm
STL
-
BUF
45h 14m2 stops
$286Frontier
Sat, Jan 17 - Sat, Jan 24
United Airlines Logo
8:30 am - 12:29 pm
BUF
-
STL
4h 59m1 stop
United Airlines Logo
11:20 am - 10:31 pm
STL
-
BUF
10h 11m2 stops
$287United Airlines
Thu, Jan 29 - Tue, Feb 3

Frontier flights from Buffalo to St. Louis

Our best Frontier deals on Buffalo to St. Louis flight tickets
Frontier
Jan 12
BUF10:26 amBuffalo
6h 39m
1 stop
STL4:05 pmLambert-St Louis
Jan 21
STL5:42 pmLambert-St Louis
24h 22m
1 stop
BUF7:04 pmBuffalo
$146
Find similar
Frontier
Jan 30
BUF7:31 pmBuffalo
16h 40m
1 stop
STL11:11 amLambert-St Louis
Feb 4
STL8:22 pmLambert-St Louis
15h 22m
1 stop
BUF12:44 pmBuffalo
$193
Find similar
Frontier
Jan 30
BUF7:31 pmBuffalo
16h 40m
1 stop
STL11:11 amLambert-St Louis
Feb 4
STL8:22 pmLambert-St Louis
21h 42m
2 stops
BUF7:04 pmBuffalo
$235
Find similar

Delta flights from Buffalo to St. Louis

Our best Delta deals on Buffalo to St. Louis flight tickets
Delta
Jan 18
BUF6:03 amBuffalo
4h 36m
1 stop
STL9:39 amLambert-St Louis
Jan 20
STL5:56 pmLambert-St Louis
4h 01m
1 stop
BUF10:57 pmBuffalo
$223
Find similar
Delta
Jan 11
BUF6:38 pmBuffalo
6h 01m
1 stop
STL11:39 pmLambert-St Louis
Jan 13
STL9:45 amLambert-St Louis
6h 10m
1 stop
BUF4:55 pmBuffalo
$322
Find similar
Delta
Dec 31
BUF6:10 amBuffalo
4h 14m
1 stop
STL9:24 amLambert-St Louis
Jan 4
STL6:29 amLambert-St Louis
3h 52m
1 stop
BUF11:21 amBuffalo
$335
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 21, 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

Mon 1/12

10:26 am-4:05 pm

1 stop6h 39m

Lambert-St Louis

Wed 1/21

5:42 pm-7:04 pm

1 stop24h 22m

$146

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 1/30

7:31 pm-11:11 am

1 stop16h 40m

Lambert-St Louis

Wed 2/4

8:22 pm-12:44 pm

1 stop15h 22m

$193

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sun 1/18

6:03 am-9:39 am

1 stop4h 36m

Lambert-St Louis

Tue 1/20

9:59 am-5:54 pm

1 stop6h 55m

$223

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Fri 1/30

7:31 pm-11:11 am

1 stop16h 40m

Lambert-St Louis

Wed 2/4

8:22 pm-7:04 pm

2 stops21h 42m

$235

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sat 1/17

5:16 am-9:24 am

1 stop5h 08m

Lambert-St Louis

Sat 1/24

10:17 am-5:49 pm

1 stop6h 32m

$239

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sun 1/18

8:00 am-3:04 pm

2 stops8h 04m

Lambert-St Louis

Tue 1/20

6:52 am-12:08 pm

1 stop4h 16m

$251

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Thu 1/29

8:30 am-12:29 pm

1 stop4h 59m

Lambert-St Louis

Tue 2/3

8:30 am-2:14 pm

1 stop4h 44m

$282

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sun 1/18

8:00 am-3:04 pm

2 stops8h 04m

Lambert-St Louis

Tue 1/20

6:52 am-12:08 pm

1 stop4h 16m

$284

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Sat 1/17

8:06 pm-9:11 am

1 stop14h 05m

Lambert-St Louis

Sat 1/24

8:22 pm-6:36 pm

2 stops45h 14m

$286

BuffaloSt. Louis

BUF - STL

BUFSTL

Buffalo

Thu 1/29

8:30 am-12:29 pm

1 stop4h 59m

Lambert-St Louis

Tue 2/3

11:20 am-10:31 pm

2 stops10h 11m

$287

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 $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

4h 36m

Direct flights

None
The fastest flight from Buffalo to St. Louis takes 4h 36m
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 4h 36m, 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
8,014 reviews
Search Delta flights
American AirlinesPriceFrom $243Free CancellationRating
7.2
11,051 reviews
Search American Airlines flights
United AirlinesPriceFrom $296Free CancellationRating
7.4
9,102 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
St. Peters
Wentzville
Collinsville
Alton
Farmington
Clayton
Festus
Glencoe
Eureka
Edwardsville
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.

An easier way to manage your St. Louis trip

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