$334+ 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 6/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
May 15 — May 221
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Buenos Aires with Cheapflights
1. Tell us where you want to go
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from St. Louis to Buenos Aires
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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 April 15, 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 April 15, 2026.
This Ovago deal was found by Cheapflights users on 4/10. 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.
Thu 6/41:27 pm
STL
- EZE
1 stop18h 18m
LATAM Airlines
Tue 6/308:10 pm
EZE
- STL
1 stop23h 57m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,084
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:51 am
STL
- AEP
2 stops19h 39m
LATAM Airlines
Thu 6/183:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,089
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/91:39 pm
STL
- EZE
2 stops19h 51m
LATAM Airlines
Tue 6/163:55 am
EZE
- STL
2 stops22h 01m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,089
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:51 am
STL
- EZE
2 stops20h 29m
LATAM Airlines
Mon 6/1510:40 pm
EZE
- STL
2 stops21h 27m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,093
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/89:21 am
STL
- EZE
1 stop22h 24m
Delta
Mon 6/153:55 am
EZE
- STL
2 stops22h 01m
Delta
Deal found 4/14![Delta logo]()
$1,097
This LATAM Airlines deal was found by Cheapflights users on 4/10. 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.
Mon 6/15:20 pm
STL
- EZE
2 stops16h 10m
Multiple Airlines
Mon 6/158:10 pm
EZE
- STL
1 stop14h 06m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,098
This Delta deal was found by Cheapflights users on 4/10. 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.
Thu 6/49:13 am
STL
- EZE
1 stop22h 32m
Delta
Wed 7/18:10 pm
EZE
- STL
1 stop29h 46m
Delta
Deal found 4/10![Delta logo]()
$1,127
This BusinessClass deal was found by Cheapflights users on 4/10. 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.
Thu 6/47:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Thu 7/27:35 am
EZE
- STL
2 stops18h 21m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,138
This KAYAK deal was found by Cheapflights users on 4/10. 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 10/711:51 am
STL
- AEP
2 stops17h 49m
LATAM Airlines
Wed 10/213:45 pm
AEP
- STL
2 stops18h 27m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/11:39 pm
STL
- EZE
2 stops19h 51m
LATAM Airlines
Mon 8/38:10 pm
EZE
- STL
1 stop15h 33m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 4/13. 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.
Mon 12/141:30 pm
STL
- EZE
2 stops17h 10m
LATAM Airlines
Sun 1/173:55 am
EZE
- STL
2 stops22h 44m
LATAM Airlines
Deal found 4/13![LATAM Airlines logo]()
$1,143
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/13:45 pm
STL
- EZE
1 stop16h 00m
Delta
Mon 8/38:10 pm
EZE
- STL
1 stop20h 25m
Delta
Deal found 4/14![Delta logo]()
$1,147
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 April 15, 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 April 15, 2026.
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:51 am
STL
- AEP
2 stops19h 39m
LATAM Airlines
Thu 6/183:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,089
This Delta deal was found by Cheapflights users on 4/10. 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.
Thu 6/410:49 am
STL
- EZE
2 stops20h 31m
Delta
Wed 7/18:10 pm
EZE
- STL
1 stop29h 46m
Delta
Deal found 4/10![Delta logo]()
$1,131
This LATAM Airlines deal was found by Cheapflights users on 4/14. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/11:39 pm
STL
- EZE
2 stops17h 41m
Multiple Airlines
Mon 8/31:10 pm
EZE
- STL
2 stops22h 33m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$1,151
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Mon 5/251:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Mon 6/14:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/10![Air Canada logo]()
$1,165
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/88:35 am
STL
- EZE
1 stop21h 25m
United Airlines
Wed 6/179:00 pm
EZE
- STL
2 stops37h 41m
United Airlines
Deal found 4/14![United Airlines logo]()
$1,169
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/810:51 am
STL
- AEP
2 stops19h 39m
LATAM Airlines
Mon 6/153:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,089
This Mytrip deal was found by Cheapflights users on 4/10. 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 5/271:05 pm
STL
- EZE
3 stops34h 15m
Multiple Airlines
Fri 6/54:45 am
EZE
- STL
3 stops33h 21m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,176
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:00 am
STL
- AEP
2 stops23h 40m
LATAM Airlines
Thu 6/183:45 pm
AEP
- STL
2 stops22h 49m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,089
This United Airlines deal was found by Cheapflights users on 4/10. 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 5/256:00 am
STL
- EZE
2 stops24h 00m
United Airlines
Mon 6/19:00 pm
EZE
- STL
2 stops26h 16m
United Airlines
Deal found 4/10![United Airlines logo]()
$1,201
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/59:13 am
STL
- EZE
1 stop22h 32m
Delta
Fri 6/128:10 pm
EZE
- STL
1 stop14h 58m
Delta
Deal found 4/14![Delta logo]()
$1,227
This Mytrip deal was found by Cheapflights users on 4/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/292:15 pm
STL
- EZE
3 stops33h 30m
Multiple Airlines
Fri 6/54:00 am
EZE
- STL
3 stops34h 06m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$1,200
This Delta deal was found by Cheapflights users on 4/14. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/57:01 pm
STL
- EZE
1 stop12h 44m
Delta
Sat 6/1310:40 pm
EZE
- STL
2 stops19h 37m
Delta
Deal found 4/14![Delta logo]()
$1,231
This KAYAK deal was found by Cheapflights users on 4/10. 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 10/711:51 am
STL
- EZE
2 stops19h 29m
LATAM Airlines
Wed 10/218:10 pm
EZE
- STL
1 stop16h 38m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,143
This Delta deal was found by Cheapflights users on 4/10. 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 6/17:01 pm
STL
- AEP
2 stops18h 59m
Delta
Mon 6/158:05 pm
AEP
- STL
2 stops18h 29m
Delta
Deal found 4/10![Delta logo]()
$1,263
This SmartFares deal was found by Cheapflights users on 4/10. 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.
Thu 6/46:00 am
STL
- AEP
2 stops23h 40m
LATAM Airlines
Tue 6/308:05 pm
AEP
- STL
2 stops18h 29m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,152
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Mon 5/257:05 am
STL
- AEP
2 stops32h 15m
Multiple Airlines
Mon 6/17:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,324
This KAYAK deal was found by Cheapflights users on 4/10. 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.
Thu 6/47:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Thu 7/28:10 pm
EZE
- STL
1 stop15h 36m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,159
This Mytrip deal was found by Cheapflights users on 4/10. 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 5/271:05 pm
STL
- AEP
2 stops26h 15m
Multiple Airlines
Fri 6/57:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,409
This SmartFares deal was found by Cheapflights users on 4/10. 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.
Thu 6/410:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Thu 7/23:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,177
This Mytrip deal was found by Cheapflights users on 4/13. 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.
Tue 5/261:05 pm
STL
- AEP
2 stops29h 55m
Multiple Airlines
Sun 5/318:05 pm
AEP
- STL
3 stops42h 01m
Multiple Airlines
Deal found 4/13![Multiple Airlines logo]()
$1,410
This KAYAK deal was found by Cheapflights users on 4/13. 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.
Thu 8/2711:51 am
STL
- AEP
2 stops18h 39m
LATAM Airlines
Mon 8/318:05 pm
AEP
- STL
2 stops16h 36m
LATAM Airlines
Deal found 4/13![LATAM Airlines logo]()
$1,285
This KAYAK deal was found by Cheapflights users on 4/14. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/15:07 pm
STL
- AEP
2 stops20h 53m
LATAM Airlines
Mon 8/35:35 pm
AEP
- STL
2 stops20h 42m
LATAM Airlines
Deal found 4/14![LATAM Airlines logo]()
$1,289
This LATAM Airlines deal was found by Cheapflights users on 4/11. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/234:00 pm
STL
- AEP
2 stops22h 00m
LATAM Airlines
Sun 5/318:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 4/11![LATAM Airlines logo]()
$1,412
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 15, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 15, 2026 and is based on user searches.
This LATAM Airlines deal was found by Cheapflights users on 4/10. 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 5/201:27 pm
STL
- EZE
1 stop18h 18m
LATAM Airlines
Wed 5/271:10 pm
EZE
- STL
2 stops22h 34m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,273
This LATAM Airlines deal was found by Cheapflights users on 4/10. 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 5/205:15 pm
STL
- AEP
2 stops20h 45m
LATAM Airlines
Wed 5/275:35 pm
AEP
- STL
2 stops20h 45m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,297
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Mon 5/251:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Mon 6/14:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/10![Air Canada logo]()
$1,165
This United Airlines deal was found by Cheapflights users on 4/10. 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 5/252:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Mon 6/19:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/10![United Airlines logo]()
$1,197
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Mon 5/251:05 pm
STL
- EZE
2 stops35h 55m
Multiple Airlines
Sun 5/312:30 am
EZE
- STL
3 stops35h 36m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,261
This Mytrip deal was found by Cheapflights users on 4/10. 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.
Mon 5/257:05 am
STL
- AEP
2 stops32h 15m
Multiple Airlines
Mon 6/17:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,324
This Mytrip deal was found by Cheapflights users on 4/10. 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 5/271:05 pm
STL
- EZE
3 stops34h 15m
Multiple Airlines
Fri 6/54:45 am
EZE
- STL
3 stops33h 21m
Multiple Airlines
Deal found 4/10![Multiple Airlines logo]()
$1,176
This United Airlines deal was found by Cheapflights users on 4/10. 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 5/278:35 am
STL
- EZE
1 stop21h 25m
United Airlines
Fri 6/59:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/10![United Airlines logo]()
$1,262
This LATAM Airlines deal was found by Cheapflights users on 4/10. 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 5/276:57 pm
STL
- AEP
2 stops19h 03m
LATAM Airlines
Fri 6/53:45 pm
AEP
- STL
2 stops19h 03m
LATAM Airlines
Deal found 4/10![LATAM Airlines logo]()
$1,337
This Mytrip deal was found by Cheapflights users on 4/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/292:15 pm
STL
- EZE
3 stops33h 30m
Multiple Airlines
Fri 6/54:00 am
EZE
- STL
3 stops34h 06m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 4/14. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/2911:10 am
STL
- EZE
1 stop18h 50m
United Airlines
Fri 6/59:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/14![United Airlines logo]()
$1,302
This LATAM Airlines deal was found by Cheapflights users on 4/15. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/3012:59 pm
STL
- AEP
2 stops17h 31m
LATAM Airlines
Sat 6/62:55 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 4/15![LATAM Airlines logo]()
$1,377
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 April 15, 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 April 15, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:31 pm
STL
- EZE
3 stops51h 54m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$334
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/65:27 pm
STL
- EZE
3 stops34h 13m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 4/14. 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.
Sat 5/305:27 pm
STL
- EZE
3 stops52h 58m
Multiple Airlines
Deal found 4/14![Multiple Airlines logo]()
$343
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/55:27 pm
STL
- EZE
3 stops34h 13m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$373
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/96:31 pm
STL
- AEP
3 stops35h 59m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$388
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/85:27 pm
STL
- AEP
3 stops37h 03m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$394
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 6/64:19 pm
STL
- AEP
3 stops41h 11m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$399
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/54:19 pm
STL
- AEP
3 stops41h 11m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$409
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/105:13 pm
STL
- EZE
3 stops31h 47m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$427
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 6/104:17 pm
STL
- AEP
3 stops29h 13m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$452
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/74:19 pm
STL
- AEP
3 stops40h 06m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$455
This Kiwi.com deal was found by Cheapflights users on 4/12. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 6/76:33 pm
STL
- EZE
3 stops33h 07m
Multiple Airlines
Deal found 4/12![Multiple Airlines logo]()
$456
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 April 15, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,084 (Ovago) |
One-way from | $334 (Kiwi.com) |
Popular in | June |
Cheapest in | October |
Average price | $1,227 |
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 April 15, 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
Mon 6/8
10:51 am-8:30 am
2 stops19h 39m
Buenos Aires Jorge Newbery
Thu 6/18
3:45 pm-9:46 am
2 stops20h 01m
$1,089
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 6/8
10:51 am-8:30 am
2 stops19h 39m
Buenos Aires Jorge Newbery
Mon 6/15
3:45 pm-9:46 am
2 stops20h 01m
$1,089
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 6/9
6:00 am-7:40 am
2 stops23h 40m
Buenos Aires Jorge Newbery
Thu 6/18
3:45 pm-12:34 pm
2 stops22h 49m
$1,089
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 6/4
10:49 am-9:20 am
2 stops20h 31m
Buenos Aires Ministro Pistarini
Wed 7/1
8:10 pm-11:56 pm
1 stop29h 46m
$1,131
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 10/7
11:51 am-9:20 am
2 stops19h 29m
Buenos Aires Ministro Pistarini
Wed 10/21
8:10 pm-10:48 am
1 stop16h 38m
$1,143
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 7/1
1:39 pm-9:20 am
2 stops17h 41m
Buenos Aires Ministro Pistarini
Mon 8/3
1:10 pm-9:43 am
2 stops22h 33m
$1,151
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 6/4
6:00 am-7:40 am
2 stops23h 40m
Buenos Aires Jorge Newbery
Tue 6/30
8:05 pm-12:34 pm
2 stops18h 29m
$1,152
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 6/4
7:01 pm-9:45 am
1 stop12h 44m
Buenos Aires Ministro Pistarini
Thu 7/2
8:10 pm-9:46 am
1 stop15h 36m
$1,159
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 5/25
1:05 pm-2:30 pm
3 stops47h 25m
Buenos Aires Ministro Pistarini
Mon 6/1
4:35 pm-8:25 pm
3 stops53h 50m
$1,165
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 6/8
8:35 am-8:00 am
1 stop21h 25m
Buenos Aires Ministro Pistarini
Wed 6/17
9:00 pm-8:41 am
2 stops37h 41m
$1,169
Showing 1-10 of 41 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-AEP
STL-EZE
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-AEP
STL-EZE
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 April 15, 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.
Comfort
7.9
Boarding
8.1
Overall
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Boarding
8.1
Overall
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Boarding
8.1
Overall
7.9
Entertainment
7.8
Crew
8.5
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Comfort
7.9
Boarding
8.1
Overall
7.9
Entertainment
7.8
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.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
Alternative routes
Buenos Aires flight routes
Complete your trip
Flights by cabin class
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Other flights from St. Louis
Popular flights
Alternative routes for St. Louis to Buenos Aires
See prices for flight routes from nearby airports that may be better suited for you.
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 April 15, 2026.
Complete your trip
Complete your trip to Buenos Aires by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Buenos Aires by cabin class
Find flights from St. Louis to Buenos Aires, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on April 15, 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 April 15, 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 April 15, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,100 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,377 | FlexibilityNo cancel fee | On-timeN/A |