$435+ 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 9/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Aug 28 — Sep 41
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
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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 July 29, 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 July 29, 2026.
This oojo deal was found by Cheapflights users on 7/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/29:00 am
STL
- EZE
2 stops21h 40m
LATAM Airlines
Thu 12/177:20 am
EZE
- STL
2 stops19h 19m
LATAM Airlines
Deal found 7/26![LATAM Airlines logo]()
$1,133
This Delta deal was found by Cheapflights users on 7/28. 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 12/210:00 am
STL
- EZE
2 stops17h 20m
Delta
Thu 12/179:30 pm
EZE
- STL
1 stop14h 23m
Delta
Deal found 7/28![Delta logo]()
$1,148
This oojo deal was found by Cheapflights users on 7/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:40 pm
STL
- AEP
2 stops20h 20m
LATAM Airlines
Thu 12/178:40 am
AEP
- STL
2 stops29h 08m
LATAM Airlines
Deal found 7/26![LATAM Airlines logo]()
$1,179
This American Airlines deal was found by Cheapflights users on 7/27. 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.
Thu 9/102:11 pm
STL
- EZE
1 stop15h 04m
American Airlines
Thu 9/178:45 pm
EZE
- STL
1 stop18h 36m
American Airlines
Deal found 7/27![American Airlines logo]()
$1,188
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/1610:14 am
STL
- EZE
2 stops21h 26m
LATAM Airlines
Sat 11/211:10 pm
EZE
- STL
2 stops25h 05m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,194
This LATAM Airlines deal was found by Cheapflights users on 7/26. 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.
Thu 12/1010:00 am
STL
- EZE
2 stops20h 40m
LATAM Airlines
Fri 12/184:00 am
EZE
- STL
2 stops22h 39m
LATAM Airlines
Deal found 7/26![LATAM Airlines logo]()
$1,197
This United Airlines deal was found by Cheapflights users on 7/26. 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 9/93:13 pm
STL
- EZE
1 stop14h 47m
United Airlines
Wed 9/169:00 pm
EZE
- STL
1 stop23h 32m
United Airlines
Deal found 7/26![United Airlines logo]()
$1,198
This BusinessClass deal was found by Cheapflights users on 7/27. 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.
Sat 10/248:00 am
STL
- EZE
2 stops19h 53m
Copa Airlines
Sat 10/3110:43 pm
EZE
- STL
2 stops20h 57m
Copa Airlines
Deal found 7/27![Copa Airlines logo]()
$1,209
This PocketFare deal was found by Cheapflights users on 7/29. 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.
Tue 9/2210:05 am
STL
- EZE
1 stop21h 40m
LATAM Airlines
Mon 10/58:10 pm
EZE
- STL
1 stop16h 41m
LATAM Airlines
Deal found 7/29![LATAM Airlines logo]()
$1,217
This Expedia deal was found by Cheapflights users on 7/27. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/1712:00 pm
STL
- EZE
2 stops36h 45m
LATAM Airlines
Thu 11/194:00 am
EZE
- STL
2 stops22h 39m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,221
This LATAM Airlines deal was found by Cheapflights users on 7/27. 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.
Thu 9/103:40 pm
STL
- AEP
2 stops22h 20m
LATAM Airlines
Thu 9/172:55 pm
AEP
- STL
2 stops22h 00m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,228
This LATAM Airlines deal was found by Cheapflights users on 7/27. 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 10/2410:47 am
STL
- AEP
2 stops27h 13m
LATAM Airlines
Sat 10/318:05 pm
AEP
- STL
2 stops30h 49m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,238
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 July 29, 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 July 29, 2026.
This Delta deal was found by Cheapflights users on 7/26. 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 1/113:40 pm
STL
- AEP
2 stops24h 00m
Delta
Tue 1/198:05 pm
AEP
- STL
2 stops22h 50m
Delta
Deal found 7/26![Delta logo]()
$1,148
This American Airlines deal was found by Cheapflights users on 7/28. 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 12/25:10 am
STL
- EZE
1 stop23h 15m
American Airlines
Thu 12/1710:30 pm
EZE
- STL
1 stop21h 40m
American Airlines
Deal found 7/28![American Airlines logo]()
$1,148
This oojo deal was found by Cheapflights users on 7/25. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:40 pm
STL
- AEP
2 stops20h 20m
LATAM Airlines
Thu 12/178:40 am
AEP
- STL
2 stops29h 08m
LATAM Airlines
Deal found 7/25![LATAM Airlines logo]()
$1,179
This United Airlines deal was found by Cheapflights users on 7/26. 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 9/93:13 pm
STL
- EZE
1 stop14h 47m
United Airlines
Wed 9/169:00 pm
EZE
- STL
1 stop23h 32m
United Airlines
Deal found 7/26![United Airlines logo]()
$1,198
This Delta deal was found by Cheapflights users on 7/26. 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 1/139:00 am
STL
- AEP
2 stops19h 40m
Delta
Thu 1/215:35 pm
AEP
- STL
2 stops24h 08m
Delta
Deal found 7/26![Delta logo]()
$1,148
This LATAM Airlines deal was found by Cheapflights users on 7/27. 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 10/2410:47 am
STL
- AEP
2 stops27h 13m
LATAM Airlines
Sat 10/318:05 pm
AEP
- STL
2 stops30h 49m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,238
This United Airlines deal was found by Cheapflights users on 7/26. 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.
Thu 1/146:15 am
STL
- EZE
1 stop22h 05m
United Airlines
Tue 1/1911:55 pm
EZE
- STL
1 stop19h 49m
United Airlines
Deal found 7/26![United Airlines logo]()
$1,238
This Delta deal was found by Cheapflights users on 7/26. 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.
Tue 1/123:40 pm
STL
- AEP
2 stops21h 20m
Delta
Thu 1/215:35 pm
AEP
- STL
2 stops24h 08m
Delta
Deal found 7/26![Delta logo]()
$1,148
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:38 pm
STL
- AEP
2 stops38h 52m
LATAM Airlines
Fri 11/208:40 am
AEP
- STL
2 stops27h 13m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,252
This United Airlines deal was found by Cheapflights users on 7/28. 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.
Sat 9/128:00 am
STL
- EZE
2 stops22h 00m
United Airlines
Sat 9/199:00 pm
EZE
- STL
1 stop15h 10m
United Airlines
Deal found 7/28![United Airlines logo]()
$1,262
This Delta deal was found by Cheapflights users on 7/26. 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.
Tue 1/123:40 pm
STL
- AEP
2 stops21h 20m
Delta
Tue 1/195:35 pm
AEP
- STL
2 stops25h 20m
Delta
Deal found 7/26![Delta logo]()
$1,148
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/175:38 pm
STL
- AEP
2 stops38h 52m
LATAM Airlines
Sat 11/219:45 pm
AEP
- STL
2 stops38h 08m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,252
This Delta deal was found by Cheapflights users on 7/26. 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 1/113:40 pm
STL
- AEP
2 stops21h 20m
Delta
Thu 1/215:35 pm
AEP
- STL
2 stops24h 08m
Delta
Deal found 7/26![Delta logo]()
$1,148
This Delta deal was found by Cheapflights users on 7/25. 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 12/24:13 pm
STL
- EZE
1 stop15h 42m
Delta
Thu 12/177:20 am
EZE
- STL
2 stops20h 16m
Delta
Deal found 7/25![Delta logo]()
$1,148
This Delta deal was found by Cheapflights users on 7/26. 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.
Sun 1/106:59 pm
STL
- EZE
1 stop33h 36m
Delta
Fri 1/229:30 pm
EZE
- STL
1 stop13h 42m
Delta
Deal found 7/26![Delta logo]()
$1,201
This Delta deal was found by Cheapflights users on 7/26. 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 1/141:01 pm
STL
- EZE
2 stops17h 39m
Delta
Mon 1/181:10 pm
EZE
- STL
2 stops24h 38m
Delta
Deal found 7/26![Delta logo]()
$1,232
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated July 29, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated July 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 7/27. 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 7/296:34 am
STL
- EZE
1 stop18h 01m
Multiple Airlines
Fri 7/3112:00 pm
EZE
- STL
2 stops33h 23m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$1,767
This United Airlines deal was found by Cheapflights users on 7/25. 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 7/296:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Fri 7/319:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 7/25![United Airlines logo]()
$1,800
This American Airlines deal was found by Cheapflights users on 7/27. 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 7/298:38 am
STL
- EZE
1 stop20h 37m
American Airlines
Fri 7/3110:00 pm
EZE
- STL
1 stop22h 32m
American Airlines
Deal found 7/27![American Airlines logo]()
$1,940
This oojo deal was found by Cheapflights users on 7/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/291:22 pm
STL
- AEP
2 stops19h 08m
LATAM Airlines
Fri 7/319:25 am
AEP
- STL
2 stops25h 41m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$1,979
This FlightHub deal was found by Cheapflights users on 7/27. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/293:58 pm
STL
- EZE
2 stops17h 32m
LATAM Airlines
Fri 7/317:35 am
EZE
- STL
3 stops30h 55m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$2,104
This oojo deal was found by Cheapflights users on 7/26. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/306:58 pm
STL
- AEP
2 stops19h 02m
LATAM Airlines
Sat 8/13:45 pm
AEP
- STL
2 stops18h 34m
LATAM Airlines
Deal found 7/26![LATAM Airlines logo]()
$1,824
This FlightHub deal was found by Cheapflights users on 7/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/301:22 pm
STL
- EZE
2 stops35h 23m
LATAM Airlines
Sat 8/112:15 pm
EZE
- STL
2 stops26h 02m
LATAM Airlines
Deal found 7/26![LATAM Airlines logo]()
$1,856
This KAYAK deal was found by Cheapflights users on 7/26. 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 7/306:14 am
STL
- EZE
1 stop23h 46m
Multiple Airlines
Sat 8/19:00 pm
EZE
- STL
1 stop22h 42m
Multiple Airlines
Deal found 7/26![Multiple Airlines logo]()
$1,969
This KAYAK deal was found by Cheapflights users on 7/24. 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.
Sat 8/155:33 pm
STL
- EZE
1 stop14h 12m
LATAM Airlines
Mon 8/243:55 am
EZE
- STL
2 stops21h 26m
LATAM Airlines
Deal found 7/24![LATAM Airlines logo]()
$1,258
This Mytrip deal was found by Cheapflights users on 7/24. 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.
Sat 8/158:55 am
STL
- EZE
3 stops34h 30m
Multiple Airlines
Tue 8/259:15 am
EZE
- STL
3 stops30h 47m
Multiple Airlines
Deal found 7/24![Multiple Airlines logo]()
$1,704
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 July 29, 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 July 29, 2026.
This Kiwi.com deal was found by Cheapflights users on 7/25. 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 9/112:29 pm
STL
- EZE
3 stops35h 41m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$435
This Kiwi.com deal was found by Cheapflights users on 7/25. 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.
Thu 9/106:39 pm
STL
- EZE
2 stops34h 06m
Multiple Airlines
Deal found 7/25![Multiple Airlines logo]()
$455
This Kiwi.com deal was found by Cheapflights users on 7/27. 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.
Thu 8/66:34 am
STL
- AEP
3 stops25h 17m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$748
This FlightHub deal was found by Cheapflights users on 7/26. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:04 pm
STL
- AEP
2 stops31h 36m
Avianca
Deal found 7/26![Avianca logo]()
$756
This Kiwi.com deal was found by Cheapflights users on 7/27. 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.
Thu 8/66:34 am
STL
- EZE
3 stops28h 31m
Multiple Airlines
Deal found 7/27![Multiple Airlines logo]()
$760
This Avianca deal was found by Cheapflights users on 7/26. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:04 pm
STL
- EZE
2 stops17h 46m
Avianca
Deal found 7/26![Avianca logo]()
$764
This LATAM Airlines deal was found by Cheapflights users on 7/27. 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.
Thu 8/611:00 am
STL
- AEP
2 stops18h 40m
LATAM Airlines
Deal found 7/27![LATAM Airlines logo]()
$809
This LATAM Airlines deal was found by Cheapflights users on 7/26. 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 12/210:00 am
STL
- EZE
1 stop20h 40m
Delta
Deal found 7/26![Delta logo]()
$809
This PocketFare deal was found by Cheapflights users on 7/25. 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.
Thu 9/106:00 am
STL
- EZE
1 stop25h 45m
LATAM Airlines
Deal found 7/25![LATAM Airlines logo]()
$871
This PocketFare deal was found by Cheapflights users on 7/25. 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.
Fri 9/115:46 pm
STL
- EZE
1 stop13h 59m
LATAM Airlines
Deal found 7/25![LATAM Airlines logo]()
$881
This SmartFares deal was found by Cheapflights users on 7/25. 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 9/105:46 pm
STL
- AEP
2 stops20h 14m
LATAM Airlines
Deal found 7/25![LATAM Airlines logo]()
$1,040
This SmartFares deal was found by Cheapflights users on 7/25. 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.
Fri 9/116:00 am
STL
- AEP
2 stops23h 40m
LATAM Airlines
Deal found 7/25![LATAM Airlines logo]()
$1,077
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 July 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,118 (oojo) |
One-way from | $435 (Kiwi.com) |
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 July 29, 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 1/11
3:40 pm-6:40 pm
2 stops24h 00m
Buenos Aires Jorge Newbery
Tue 1/19
8:05 pm-3:55 pm
2 stops22h 50m
$1,148
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 12/2
5:10 am-7:25 am
1 stop23h 15m
Buenos Aires Ministro Pistarini
Thu 12/17
10:30 pm-5:10 pm
1 stop21h 40m
$1,148
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Wed 1/13
9:00 am-7:40 am
2 stops19h 40m
Buenos Aires Jorge Newbery
Thu 1/21
5:35 pm-2:43 pm
2 stops24h 08m
$1,148
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 1/12
3:40 pm-4:00 pm
2 stops21h 20m
Buenos Aires Jorge Newbery
Thu 1/21
5:35 pm-2:43 pm
2 stops24h 08m
$1,148
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 1/12
3:40 pm-4:00 pm
2 stops21h 20m
Buenos Aires Jorge Newbery
Tue 1/19
5:35 pm-3:55 pm
2 stops25h 20m
$1,148
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 1/11
3:40 pm-4:00 pm
2 stops21h 20m
Buenos Aires Jorge Newbery
Thu 1/21
5:35 pm-2:43 pm
2 stops24h 08m
$1,148
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 12/2
4:13 pm-10:55 am
1 stop15h 42m
Buenos Aires Ministro Pistarini
Thu 12/17
7:20 am-12:36 am
2 stops20h 16m
$1,148
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Wed 12/2
4:40 pm-4:00 pm
2 stops20h 20m
Buenos Aires Jorge Newbery
Thu 12/17
8:40 am-10:48 am
2 stops29h 08m
$1,179
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 9/9
3:13 pm-8:00 am
1 stop14h 47m
Buenos Aires Ministro Pistarini
Wed 9/16
9:00 pm-6:32 pm
1 stop23h 32m
$1,198
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Sun 1/10
6:59 pm-7:35 am
1 stop33h 36m
Buenos Aires Ministro Pistarini
Fri 1/22
9:30 pm-8:12 am
1 stop13h 42m
$1,201
Showing 1-10 of 30 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Buenos Aires
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Buenos Aires in July.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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
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 July 29, 2026.
Get a feel of what it's like to fly with Delta and LATAM 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.
Boarding
8.1
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Boarding
8.1
Overall
7.8
Entertainment
7.8
Food
7.2
Comfort
7.8
Crew
8.5
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
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Other flights to Buenos Aires
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St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on July 29, 2026.
Other flights from St. Louis
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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 July 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,173 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,414 | FlexibilityNo cancel fee | On-timeN/A |