$1,082+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Apr 15 — Apr 221
Round-trip
1 adult, Economy
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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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 March 16, 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 March 16, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/15. 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.
Mon 5/46:00 am
STL
- EZE
1 stop20h 30m
Multiple Airlines
Mon 5/181:10 pm
EZE
- STL
2 stops30h 23m
Multiple Airlines
Deal found 3/15![Multiple Airlines logo]()
$1,082
This Air Canada deal was found by Cheapflights users on 3/14. 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.
Tue 5/261:00 pm
STL
- EZE
3 stops47h 30m
Air Canada
Wed 6/34:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/14![Air Canada logo]()
$1,125
This Ovago deal was found by Cheapflights users on 3/11. 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.
Tue 5/265:15 pm
STL
- EZE
1 stop14h 30m
LATAM Airlines
Wed 6/38:10 pm
EZE
- STL
1 stop15h 34m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,131
This Gotogate deal was found by Cheapflights users on 3/15. 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.
Mon 5/41:00 pm
STL
- EZE
3 stops47h 30m
Air Canada
Mon 5/184:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/15![Air Canada logo]()
$1,133
This KAYAK deal was found by Cheapflights users on 3/11. 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.
Tue 5/266:57 pm
STL
- AEP
2 stops19h 03m
LATAM Airlines
Wed 6/35:35 pm
AEP
- STL
2 stops20h 45m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,139
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Mon 5/44:44 pm
STL
- EZE
1 stop13h 16m
United Airlines
Tue 5/129:00 pm
EZE
- STL
1 stop21h 01m
United Airlines
Deal found 3/12![United Airlines logo]()
$1,147
This Delta deal was found by Cheapflights users on 3/15. 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.
Mon 5/41:02 pm
STL
- EZE
2 stops18h 18m
Delta
Mon 5/187:35 am
EZE
- STL
2 stops18h 24m
Delta
Deal found 3/15![Delta logo]()
$1,176
This Gurufare deal was found by Cheapflights users on 3/15. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/44:41 pm
STL
- EZE
2 stops14h 39m
LATAM Airlines
Tue 5/128:10 pm
EZE
- STL
1 stop15h 34m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,181
This KAYAK deal was found by Cheapflights users on 3/15. 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.
Mon 5/41:02 pm
STL
- AEP
2 stops18h 38m
LATAM Airlines
Tue 5/128:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,189
This KAYAK deal was found by Cheapflights users on 3/15. 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.
Mon 12/144:40 pm
STL
- EZE
1 stop13h 20m
LATAM Airlines
Mon 1/257:45 am
EZE
- STL
2 stops18h 54m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,189
This KAYAK deal was found by Cheapflights users on 3/15. 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.
Sun 5/247:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
Sun 5/313:45 pm
AEP
- STL
2 stops19h 59m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,269
This KAYAK deal was found by Cheapflights users on 3/13. 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.
Wed 11/111:30 pm
STL
- AEP
2 stops21h 30m
LATAM Airlines
Tue 11/176:20 pm
AEP
- STL
2 stops19h 28m
LATAM Airlines
Deal found 3/13![LATAM Airlines logo]()
$1,285
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 March 16, 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 March 16, 2026.
This KAYAK deal was found by Cheapflights users on 3/11. 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.
Tue 5/266:57 pm
STL
- AEP
2 stops19h 03m
LATAM Airlines
Wed 6/35:35 pm
AEP
- STL
2 stops20h 45m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,139
This Delta deal was found by Cheapflights users on 3/15. 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.
Mon 5/41:02 pm
STL
- EZE
2 stops18h 18m
Delta
Mon 5/187:35 am
EZE
- STL
2 stops18h 24m
Delta
Deal found 3/15![Delta logo]()
$1,176
This Air Canada deal was found by Cheapflights users on 3/11. 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.
Tue 5/267:05 am
STL
- EZE
2 stops29h 25m
Air Canada
Wed 6/34:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/11![Air Canada logo]()
$1,242
This United Airlines deal was found by Cheapflights users on 3/15. 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.
Sun 5/246:55 pm
STL
- EZE
2 stops35h 05m
United Airlines
Sun 5/319:00 pm
EZE
- STL
2 stops41h 11m
United Airlines
Deal found 3/15![United Airlines logo]()
$1,260
This Mytrip deal was found by Cheapflights users on 3/13. 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.
Wed 4/84:05 pm
STL
- EZE
2 stops20h 25m
Multiple Airlines
Wed 4/157:10 am
EZE
- STL
3 stops34h 15m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$1,369
This KAYAK deal was found by Cheapflights users on 3/11. 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.
Tue 5/265:15 pm
STL
- EZE
2 stops16h 15m
LATAM Airlines
Tue 6/23:55 am
EZE
- STL
2 stops22h 04m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,139
This Gotogate deal was found by Cheapflights users on 3/15. 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.
Mon 5/41:00 pm
STL
- EZE
3 stops47h 30m
Air Canada
Mon 5/184:35 pm
EZE
- STL
2 stops29h 50m
Air Canada
Deal found 3/15![Air Canada logo]()
$1,244
This KAYAK deal was found by Cheapflights users on 3/12. 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.
Mon 5/411:42 am
STL
- AEP
2 stops18h 48m
LATAM Airlines
Tue 5/128:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 3/12![LATAM Airlines logo]()
$1,189
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/81:10 pm
STL
- EZE
2 stops16h 50m
United Airlines
Wed 4/159:00 pm
EZE
- STL
2 stops20h 48m
United Airlines
Deal found 3/13![United Airlines logo]()
$1,331
This KAYAK deal was found by Cheapflights users on 3/15. 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.
Sun 5/245:15 pm
STL
- EZE
1 stop14h 30m
LATAM Airlines
Sun 5/318:10 pm
EZE
- STL
1 stop15h 34m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,257
This Mytrip deal was found by Cheapflights users on 3/13. 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.
Wed 4/84:05 pm
STL
- AEP
3 stops22h 55m
Multiple Airlines
Wed 4/157:00 am
AEP
- STL
3 stops34h 25m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$1,559
This KAYAK deal was found by Cheapflights users on 3/15. 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.
Sun 5/247:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
Sun 5/313:45 pm
AEP
- STL
2 stops19h 59m
LATAM Airlines
Deal found 3/15![LATAM Airlines logo]()
$1,269
This Gurufare deal was found by Cheapflights users on 3/14. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
Wed 4/83:45 pm
AEP
- STL
2 stops19h 20m
LATAM Airlines
Deal found 3/14![LATAM Airlines logo]()
$1,387
This LATAM Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/85:21 pm
STL
- AEP
2 stops20h 39m
LATAM Airlines
Wed 4/158:05 pm
AEP
- STL
2 stops16h 29m
LATAM Airlines
Deal found 3/13![LATAM Airlines logo]()
$1,407
This BusinessClass deal was found by Cheapflights users on 3/11. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/612:04 pm
STL
- AEP
2 stops17h 36m
LATAM Airlines
Sun 4/128:05 pm
AEP
- STL
2 stops16h 29m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,539
This SmartFares deal was found by Cheapflights users on 3/11. 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 SmartFares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/296:59 pm
STL
- AEP
2 stops45h 31m
LATAM Airlines
Fri 4/38:05 pm
AEP
- STL
2 stops29h 53m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,707
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated March 16, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated March 16, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/14. 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.
Wed 4/16:15 am
STL
- EZE
1 stop35h 15m
Multiple Airlines
Wed 4/84:45 am
EZE
- STL
2 stops36h 34m
Multiple Airlines
Deal found 3/14![Multiple Airlines logo]()
$1,231
This Gurufare deal was found by Cheapflights users on 3/14. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/16:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
Wed 4/83:45 pm
AEP
- STL
2 stops19h 20m
LATAM Airlines
Deal found 3/14![LATAM Airlines logo]()
$1,387
This Gurufare deal was found by Cheapflights users on 3/14. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/11:39 pm
STL
- EZE
2 stops17h 41m
LATAM Airlines
Wed 4/87:45 am
EZE
- STL
2 stops18h 13m
LATAM Airlines
Deal found 3/14![LATAM Airlines logo]()
$1,391
This American Airlines deal was found by Cheapflights users on 3/14. 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.
Wed 4/111:22 am
STL
- EZE
1 stop17h 53m
American Airlines
Wed 4/88:40 pm
EZE
- STL
1 stop15h 36m
American Airlines
Deal found 3/14![American Airlines logo]()
$1,407
This BusinessClass deal was found by Cheapflights users on 3/11. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/64:21 pm
STL
- AEP
2 stops21h 39m
LATAM Airlines
Sun 4/128:05 pm
AEP
- STL
2 stops16h 29m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,539
This United Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/84:49 pm
STL
- EZE
1 stop13h 11m
United Airlines
Wed 4/159:00 pm
EZE
- STL
1 stop14h 25m
United Airlines
Deal found 3/13![United Airlines logo]()
$1,327
This Mytrip deal was found by Cheapflights users on 3/13. 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.
Wed 4/84:05 pm
STL
- EZE
2 stops20h 25m
Multiple Airlines
Wed 4/157:10 am
EZE
- STL
3 stops34h 15m
Multiple Airlines
Deal found 3/13![Multiple Airlines logo]()
$1,369
This LATAM Airlines deal was found by Cheapflights users on 3/13. 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.
Wed 4/85:21 pm
STL
- AEP
2 stops20h 39m
LATAM Airlines
Wed 4/158:05 pm
AEP
- STL
2 stops16h 29m
LATAM Airlines
Deal found 3/13![LATAM Airlines logo]()
$1,407
This PocketFare deal was found by Cheapflights users on 3/11. 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 PocketFare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/156:50 pm
STL
- EZE
1 stop12h 55m
LATAM Airlines
Fri 6/128:10 pm
EZE
- STL
1 stop18h 24m
LATAM Airlines
Deal found 3/11![LATAM Airlines logo]()
$1,403
This United Airlines deal was found by Cheapflights users on 3/12. 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.
Sun 4/268:15 pm
STL
- EZE
2 stops33h 45m
United Airlines
Sun 5/39:00 pm
EZE
- STL
2 stops21h 39m
United Airlines
Deal found 3/12![United Airlines logo]()
$1,266
This American Airlines deal was found by Cheapflights users on 3/12. 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.
Sun 4/2611:06 am
STL
- EZE
1 stop17h 04m
American Airlines
Sun 5/311:35 pm
EZE
- STL
1 stop24h 49m
American Airlines
Deal found 3/12![American Airlines logo]()
$1,315
This LATAM Airlines deal was found by Cheapflights users on 3/12. 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.
Sun 4/261:02 pm
STL
- AEP
2 stops18h 38m
LATAM Airlines
Sun 5/38:05 pm
AEP
- STL
2 stops16h 29m
LATAM Airlines
Deal found 3/12![LATAM Airlines logo]()
$1,467
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 March 16, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,044 (Gurufare) |
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 March 16, 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 - AEP
STLAEP
Lambert-St Louis
Tue 5/26
6:57 pm-4:00 pm
2 stops19h 03m
Buenos Aires Jorge Newbery
Wed 6/3
5:35 pm-12:20 pm
2 stops20h 45m
$1,139
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 5/26
5:15 pm-11:30 am
2 stops16h 15m
Buenos Aires Ministro Pistarini
Tue 6/2
3:55 am-11:59 pm
2 stops22h 04m
$1,139
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 5/4
1:02 pm-9:20 am
2 stops18h 18m
Buenos Aires Ministro Pistarini
Mon 5/18
7:35 am-11:59 pm
2 stops18h 24m
$1,176
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 5/4
11:42 am-8:30 am
2 stops18h 48m
Buenos Aires Jorge Newbery
Tue 5/12
8:05 pm-12:20 pm
2 stops18h 15m
$1,189
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 5/26
7:05 am-2:30 pm
2 stops29h 25m
Buenos Aires Ministro Pistarini
Wed 6/3
4:35 pm-8:25 pm
3 stops53h 50m
$1,242
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 5/4
1:00 pm-2:30 pm
3 stops47h 30m
Buenos Aires Ministro Pistarini
Mon 5/18
4:35 pm-8:25 pm
2 stops29h 50m
$1,244
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Sun 5/24
5:15 pm-9:45 am
1 stop14h 30m
Buenos Aires Ministro Pistarini
Sun 5/31
8:10 pm-9:44 am
1 stop15h 34m
$1,257
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Sun 5/24
6:55 pm-8:00 am
2 stops35h 05m
Buenos Aires Ministro Pistarini
Sun 5/31
9:00 pm-12:11 pm
2 stops41h 11m
$1,260
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Sun 5/24
7:05 pm-4:00 pm
2 stops18h 55m
Buenos Aires Jorge Newbery
Sun 5/31
3:45 pm-9:44 am
2 stops19h 59m
$1,269
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 4/8
1:10 pm-8:00 am
2 stops16h 50m
Buenos Aires Ministro Pistarini
Wed 4/15
9:00 pm-3:48 pm
2 stops20h 48m
$1,331
Showing 1-10 of 16 resultsSorted by cheapest first
- Most accurate provider: When it comes to deals on St. Louis-Buenos Aires flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Buenos Aires flight searches over the past month and is updated monthly.
- 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
How much does it cost to fly round-trip from St. Louis to Buenos Aires?
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 March 16, 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.
Crew
8.5
Comfort
7.9
Boarding
8.1
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Comfort
7.9
Boarding
8.1
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Comfort
7.9
Boarding
8.1
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Comfort
7.9
Boarding
8.1
Entertainment
7.8
Overall
7.9
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 March 16, 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 March 16, 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 March 16, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
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 March 16, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,082 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,295 | FlexibilityNo cancel fee | On-timeN/A |