$418+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/19. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
avr. 22 — avr. 291
Round-trip
1 adult, Economy
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Cheapest flights from St. Louis to Buenos AiresExplore the most affordable flight options available from St. Louis to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mars 23, 2026.
Explore the most affordable flight options available from St. Louis to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on mars 23, 2026.
This Travelocity deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Travelocity is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 6/1811:51 am
STL
- EZE
1 stop19h 54m
LATAM Airlines
jeu. 6/2512:15 pm
EZE
- STL
2 stops31h 47m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,083
This Gotogate deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/141:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
mer. 5/274:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/23![Air Canada logo]()
$1,104
This Ovago deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/227:05 pm
STL
- EZE
1 stop12h 40m
LATAM Airlines
mar. 9/298:10 pm
EZE
- STL
1 stop13h 56m
LATAM Airlines
Deal found 3/21![LATAM Airlines logo]()
$1,131
This KAYAK deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/227:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
mar. 9/292:55 pm
AEP
- STL
2 stops19h 11m
LATAM Airlines
Deal found 3/21![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 6/185:30 pm
STL
- AEP
2 stops20h 30m
LATAM Airlines
jeu. 6/253:45 pm
AEP
- STL
2 stops21h 00m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,144
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/141:27 pm
STL
- EZE
2 stops17h 53m
Delta
mer. 5/277:35 am
EZE
- STL
2 stops18h 24m
Delta
Deal found 3/23![Delta logo]()
$1,144
This American Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 9/111:48 am
STL
- EZE
1 stop17h 27m
American Airlines
mer. 9/2310:20 pm
EZE
- STL
1 stop26h 52m
American Airlines
Deal found 3/19![American Airlines logo]()
$1,145
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/149:15 am
STL
- AEP
2 stops20h 25m
Delta
mer. 5/278:05 pm
AEP
- STL
2 stops18h 15m
Delta
Deal found 3/23![Delta logo]()
$1,147
This United Airlines deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 8/55:33 pm
STL
- EZE
2 stops36h 27m
United Airlines
mer. 8/129:00 pm
EZE
- STL
1 stop19h 08m
United Airlines
Deal found 3/19![United Airlines logo]()
$1,151
This Gotogate deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 5/41:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
lun. 5/114:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/20![Air Canada logo]()
$1,170
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 8/57:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
mer. 8/128:05 pm
AEP
- STL
2 stops16h 36m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,227
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/35:30 pm
STL
- AEP
2 stops24h 10m
LATAM Airlines
jeu. 8/133:45 pm
AEP
- STL
2 stops28h 17m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,239
Best flights from St. Louis to Buenos AiresDiscover carefully curated flight deals from St. Louis to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated mars 23, 2026.
Discover carefully curated flight deals from St. Louis to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated mars 23, 2026.
This Gotogate deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/141:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
mer. 5/274:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/23![Air Canada logo]()
$1,104
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 6/185:30 pm
STL
- AEP
2 stops20h 30m
LATAM Airlines
jeu. 6/253:45 pm
AEP
- STL
2 stops21h 00m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,144
This Delta deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 5/149:15 am
STL
- AEP
2 stops20h 25m
Delta
mer. 5/278:05 pm
AEP
- STL
2 stops18h 15m
Delta
Deal found 3/23![Delta logo]()
$1,147
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 5/178:30 pm
STL
- EZE
2 stops33h 30m
United Airlines
dim. 5/249:00 pm
EZE
- STL
1 stop19h 16m
United Airlines
Deal found 3/22![United Airlines logo]()
$1,191
This Mytrip deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/54:05 pm
STL
- AEP
3 stops35h 35m
Multiple Airlines
mer. 5/137:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,371
This Trip.com deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/62:15 pm
STL
- EZE
2 stops22h 15m
Air Canada
mer. 5/134:35 pm
EZE
- STL
2 stops21h 31m
Air Canada
Deal found 3/22![Air Canada logo]()
$1,179
This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/510:25 am
STL
- EZE
2 stops19h 35m
United Airlines
mar. 5/129:00 pm
EZE
- STL
1 stop14h 30m
United Airlines
Deal found 3/21![United Airlines logo]()
$1,226
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 8/511:51 am
STL
- AEP
2 stops17h 49m
LATAM Airlines
jeu. 8/133:45 pm
AEP
- STL
2 stops28h 17m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,239
This Delta deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 5/611:42 am
STL
- AEP
2 stops19h 58m
Delta
mer. 5/133:45 pm
AEP
- STL
2 stops19h 59m
Delta
Deal found 3/22![Delta logo]()
$1,297
This KAYAK deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 8/35:30 pm
STL
- AEP
2 stops24h 10m
LATAM Airlines
jeu. 8/133:45 pm
AEP
- STL
2 stops28h 17m
LATAM Airlines
Deal found 3/19![LATAM Airlines logo]()
$1,239
This United Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 7/158:35 am
STL
- EZE
1 stop21h 25m
United Airlines
mar. 7/219:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 3/21![United Airlines logo]()
$1,297
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/45:30 pm
STL
- AEP
2 stops20h 30m
Delta
mar. 8/118:05 pm
AEP
- STL
2 stops16h 36m
Delta
Deal found 3/19![Delta logo]()
$1,385
This LATAM Airlines deal was found by Cheapflights users on 3/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/511:42 am
STL
- AEP
2 stops18h 48m
LATAM Airlines
mar. 5/128:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 3/21![LATAM Airlines logo]()
$1,297
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/59:10 am
STL
- EZE
2 stops44h 50m
United Airlines
mer. 5/139:00 pm
EZE
- STL
2 stops21h 39m
United Airlines
Deal found 3/22![United Airlines logo]()
$1,301
This Delta deal was found by Cheapflights users on 3/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 8/45:30 pm
STL
- AEP
2 stops20h 30m
Delta
mer. 8/128:05 pm
AEP
- STL
2 stops18h 48m
Delta
Deal found 3/19![Delta logo]()
$1,385
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/1510:09 am
STL
- EZE
1 stop19h 51m
United Airlines
ven. 6/129:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 3/22![United Airlines logo]()
$1,317
This LATAM Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 8/281:30 pm
STL
- AEP
2 stops22h 30m
LATAM Airlines
mar. 9/15:35 pm
AEP
- STL
2 stops26h 27m
LATAM Airlines
Deal found 3/22![LATAM Airlines logo]()
$1,343
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated mars 23, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated mars 23, 2026 and is based on user searches.
This KAYAK deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
jeu. 3/266:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
sam. 3/283:40 pm
AEP
- STL
2 stops21h 29m
LATAM Airlines
Deal found 3/22![LATAM Airlines logo]()
$1,710
This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/59:10 am
STL
- EZE
2 stops44h 50m
United Airlines
mer. 5/139:00 pm
EZE
- STL
2 stops21h 39m
United Airlines
Deal found 3/22![United Airlines logo]()
$1,301
This Mytrip deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/54:05 pm
STL
- AEP
3 stops35h 35m
Multiple Airlines
mer. 5/137:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,371
This KAYAK deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/56:00 am
STL
- EZE
1 stop24h 00m
Multiple Airlines
mer. 5/139:00 pm
EZE
- STL
2 stops21h 39m
Multiple Airlines
Deal found 3/22![Multiple Airlines logo]()
$1,377
This Air Canada deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/54:05 pm
STL
- EZE
2 stops20h 25m
Air Canada
mer. 5/134:35 pm
EZE
- STL
3 stops29h 50m
Air Canada
Deal found 3/22![Air Canada logo]()
$1,402
This KAYAK deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/56:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
mer. 5/136:20 pm
AEP
- STL
2 stops20h 00m
LATAM Airlines
Deal found 3/22![LATAM Airlines logo]()
$2,063
This United Airlines deal was found by Cheapflights users on 3/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mer. 4/154:49 pm
STL
- EZE
1 stop13h 11m
United Airlines
ven. 6/129:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 3/23![United Airlines logo]()
$1,317
This United Airlines deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 4/178:21 am
STL
- EZE
2 stops21h 39m
United Airlines
ven. 4/249:00 pm
EZE
- STL
2 stops26h 52m
United Airlines
Deal found 3/20![United Airlines logo]()
$1,381
One-way flights from St. Louis to Buenos AiresSearch for one-way flight options from St. Louis to Buenos Aires. Find affordable one-way fares based on user searches. Data last updated mars 23, 2026.
Search for one-way flight options from St. Louis to Buenos Aires. Find affordable one-way fares based on user searches. Data last updated mars 23, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/1911:16 am
STL
- AEP
3 stops43h 14m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$418
This Kiwi.com deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/1911:42 am
STL
- EZE
3 stops39h 58m
Multiple Airlines
Deal found 3/20![Multiple Airlines logo]()
$506
This American Airlines deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
dim. 4/1911:06 am
STL
- EZE
1 stop18h 09m
American Airlines
Deal found 3/20![American Airlines logo]()
$852
This KAYAK deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 5/86:29 am
STL
- EZE
2 stops24h 21m
American Airlines
Deal found 3/20![American Airlines logo]()
$2,462
This KAYAK deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sam. 5/911:15 am
STL
- EZE
3 stops49h 15m
Air Canada
Deal found 3/20![Air Canada logo]()
$3,060
This KAYAK deal was found by Cheapflights users on 3/20. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
ven. 5/81:24 pm
STL
- EZE
3 stops23h 06m
Air Canada
Deal found 3/20![Air Canada logo]()
$3,860
Find flight deals from St. Louis to Buenos Aires
Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Buenos Aires (BUE). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated mars 23, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,083 (Travelocity) |
One-way from | $418 (Kiwi.com) |
Popular in | November |
Cheapest in | September |
Average price | $1,193 |
Cheapflights Fare Finder
Customize your flight search to find flights from St. Louis to Buenos Aires 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, Cheapflights users made 2,558,603 searches. Data last updated mars 23, 2026.
Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
jeu. 5/14
1:05 pm-2:30 pm
3 stops47h 25m
Buenos Aires Ministro Pistarini
mer. 5/27
4:35 pm-8:25 pm
3 stops53h 50m
$1,104
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
jeu. 6/18
5:30 pm-4:00 pm
2 stops20h 30m
Buenos Aires Jorge Newbery
jeu. 6/25
3:45 pm-10:45 am
2 stops21h 00m
$1,144
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
jeu. 5/14
9:15 am-7:40 am
2 stops20h 25m
Buenos Aires Jorge Newbery
mer. 5/27
8:05 pm-12:20 pm
2 stops18h 15m
$1,147
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
mer. 5/6
2:15 pm-2:30 pm
2 stops22h 15m
Buenos Aires Ministro Pistarini
mer. 5/13
4:35 pm-12:06 pm
2 stops21h 31m
$1,179
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
dim. 5/17
8:30 pm-8:00 am
2 stops33h 30m
Buenos Aires Ministro Pistarini
dim. 5/24
9:00 pm-2:16 pm
1 stop19h 16m
$1,191
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
mar. 5/5
10:25 am-8:00 am
2 stops19h 35m
Buenos Aires Ministro Pistarini
mar. 5/12
9:00 pm-9:30 am
1 stop14h 30m
$1,226
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
mer. 8/5
11:51 am-7:40 am
2 stops17h 49m
Buenos Aires Jorge Newbery
jeu. 8/13
3:45 pm-6:02 pm
2 stops28h 17m
$1,239
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
lun. 8/3
5:30 pm-7:40 pm
2 stops24h 10m
Buenos Aires Jorge Newbery
jeu. 8/13
3:45 pm-6:02 pm
2 stops28h 17m
$1,239
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
mer. 5/6
11:42 am-9:40 am
2 stops19h 58m
Buenos Aires Jorge Newbery
mer. 5/13
3:45 pm-9:44 am
2 stops19h 59m
$1,297
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
mer. 7/15
8:35 am-8:00 am
1 stop21h 25m
Buenos Aires Ministro Pistarini
mar. 7/21
9:00 pm-9:26 pm
2 stops26h 26m
$1,297
Showing 1-10 of 22 resultsSorted by cheapest first
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- Most trusted provider: When it comes to deals on St. Louis-Buenos Aires flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Buenos Aires
Have a flexible travel schedule? Discover the best time to fly to Buenos Aires from St. Louis with our price prediction graph.
STL-BUE
STL-EZE
STL-AEP
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Buenos Aires
STL-BUE
STL-EZE
STL-AEP
No data available for this route at this time. Please check back soon.
Reviews of airlines servicing Buenos Aires
Get insights into the airlines that provide service to Buenos Aires. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Buenos Aires. Reviews last updated mars 23, 2026.
Get a feel of what it's like to fly with Delta,LATAM Airlines, andAmerican Airlines from St. Louis to Buenos Aires by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Entertainment
7.8
Boarding
8.1
Comfort
7.9
Overall
7.9
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Entertainment
7.8
Boarding
8.1
Comfort
7.9
Overall
7.9
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Entertainment
7.8
Boarding
8.1
Comfort
7.9
Overall
7.9
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Entertainment
7.8
Boarding
8.1
Comfort
7.9
Overall
7.9
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Buenos Aires. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Other flights to Buenos Aires
Explore flights to Buenos Aires departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on mars 23, 2026.
Complete your trip
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St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on mars 23, 2026.
Other flights from St. Louis
Browse through other flights departing from St. Louis. Flights are based on user searches made on Cheapflights and were last updated on mars 23, 2026.
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Top 2 airlines flying from St. Louis to Buenos Aires
Discover the top 2 airlines that operate flights from St. Louis to Buenos Aires. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated mars 23, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,100 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,295 | FlexibilityNo cancel fee | On-timeN/A |