$510+ 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 5/6. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
May 9 — May 161
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 9, 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 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/111:10 pm
EZE
- STL
2 stops30h 23m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$1,112
This Mytrip deal was found by Cheapflights users on 4/9. 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.
Thu 5/71:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Thu 5/144:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/9![Air Canada logo]()
$1,115
This United Airlines deal was found by Cheapflights users on 4/8. 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 5/282:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Tue 6/99:00 pm
EZE
- STL
1 stop22h 42m
United Airlines
Deal found 4/8![United Airlines logo]()
$1,122
This Air Canada deal was found by Cheapflights users on 4/6. 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.
Wed 5/61:05 pm
STL
- EZE
2 stops23h 25m
Air Canada
Wed 6/174:35 pm
EZE
- STL
2 stops29h 50m
Air Canada
Deal found 4/6![Air Canada logo]()
$1,128
This KAYAK deal was found by Cheapflights users on 4/5. 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 8/35:19 pm
STL
- AEP
2 stops26h 11m
LATAM Airlines
Mon 8/108:05 pm
AEP
- STL
2 stops23h 57m
LATAM Airlines
Deal found 4/5![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 4/6. 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
1 stop16h 30m
LATAM Airlines
Mon 1/183:55 am
EZE
- STL
2 stops22h 44m
LATAM Airlines
Deal found 4/6![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 4/6. 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
Thu 1/217:45 am
EZE
- STL
2 stops18h 54m
LATAM Airlines
Deal found 4/6![LATAM Airlines logo]()
$1,143
This LATAM Airlines deal was found by Cheapflights users on 4/4. 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 8/127:05 pm
STL
- AEP
2 stops19h 55m
LATAM Airlines
Thu 8/203:45 pm
AEP
- STL
2 stops20h 56m
LATAM Airlines
Deal found 4/4![LATAM Airlines logo]()
$1,147
This American Airlines deal was found by Cheapflights users on 4/6. 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.
Tue 12/154:36 pm
STL
- EZE
1 stop13h 04m
American Airlines
Wed 1/209:40 pm
EZE
- STL
1 stop22h 44m
American Airlines
Deal found 4/6![American Airlines logo]()
$1,147
This Booking.com deal was found by Cheapflights users on 4/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/111:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Mon 5/184:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/4![Air Canada logo]()
$1,149
This Ovago deal was found by Cheapflights users on 4/8. 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 12/151:30 pm
STL
- EZE
1 stop14h 50m
LATAM Airlines
Thu 1/217:45 am
EZE
- STL
2 stops18h 54m
LATAM Airlines
Deal found 4/8![LATAM Airlines logo]()
$1,150
This Delta deal was found by Cheapflights users on 4/5. 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 8/45:19 pm
STL
- AEP
2 stops20h 41m
Delta
Fri 8/143:45 pm
AEP
- STL
2 stops27h 10m
Delta
Deal found 4/5![Delta logo]()
$1,187
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 9, 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 9, 2026.
This United Airlines deal was found by Cheapflights users on 4/5. 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 5/2811:10 am
STL
- EZE
1 stop18h 50m
United Airlines
Tue 6/99:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/5![United Airlines logo]()
$1,122
This Air Canada deal was found by Cheapflights users on 4/6. 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.
Wed 5/61:05 pm
STL
- EZE
2 stops23h 25m
Air Canada
Wed 6/174:35 pm
EZE
- STL
2 stops29h 50m
Air Canada
Deal found 4/6![Air Canada logo]()
$1,128
This KAYAK deal was found by Cheapflights users on 4/5. 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 8/41:22 pm
STL
- AEP
2 stops30h 08m
LATAM Airlines
Tue 8/118:05 pm
AEP
- STL
2 stops16h 36m
LATAM Airlines
Deal found 4/5![LATAM Airlines logo]()
$1,139
This Delta deal was found by Cheapflights users on 4/5. 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 8/45:19 pm
STL
- AEP
2 stops20h 41m
Delta
Fri 8/143:45 pm
AEP
- STL
2 stops27h 10m
Delta
Deal found 4/5![Delta logo]()
$1,187
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/66:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Tue 6/161:35 am
EZE
- STL
2 stops24h 39m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$1,202
This American Airlines deal was found by Cheapflights users on 4/6. 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 5/65:24 am
STL
- EZE
1 stop23h 51m
American Airlines
Wed 6/1710:35 pm
EZE
- STL
1 stop14h 00m
American Airlines
Deal found 4/6![American Airlines logo]()
$1,249
This KAYAK deal was found by Cheapflights users on 4/5. 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 8/41:22 pm
STL
- AEP
2 stops28h 18m
LATAM Airlines
Thu 8/133:45 pm
AEP
- STL
2 stops28h 17m
LATAM Airlines
Deal found 4/5![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 4/4. 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 8/1211:25 am
STL
- EZE
2 stops18h 35m
Multiple Airlines
Thu 8/209:00 pm
EZE
- STL
1 stop22h 49m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$1,226
This KAYAK deal was found by Cheapflights users on 4/5. 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 5/2810:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Tue 6/92:55 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 4/5![LATAM Airlines logo]()
$1,139
This Delta deal was found by Cheapflights users on 4/5. 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 8/45:19 pm
STL
- AEP
2 stops20h 41m
Delta
Mon 8/108:05 pm
AEP
- STL
2 stops18h 48m
Delta
Deal found 4/5![Delta logo]()
$1,293
This United Airlines deal was found by Cheapflights users on 4/5. 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 8/16:48 pm
STL
- EZE
2 stops35h 12m
United Airlines
Thu 8/139:00 pm
EZE
- STL
2 stops20h 38m
United Airlines
Deal found 4/5![United Airlines logo]()
$1,319
This LATAM Airlines deal was found by Cheapflights users on 4/4. 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 8/127:05 pm
STL
- AEP
2 stops19h 55m
LATAM Airlines
Thu 8/203:45 pm
AEP
- STL
2 stops20h 56m
LATAM Airlines
Deal found 4/4![LATAM Airlines logo]()
$1,147
This United Airlines deal was found by Cheapflights users on 4/8. 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 6/146:30 pm
STL
- EZE
1 stop35h 30m
United Airlines
Wed 6/179:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/8![United Airlines logo]()
$1,328
This BusinessClass deal was found by Cheapflights users on 4/9. 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 5/77:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Thu 5/147:35 am
EZE
- STL
2 stops26h 35m
LATAM Airlines
Deal found 4/9![LATAM Airlines logo]()
$1,279
This KAYAK deal was found by Cheapflights users on 4/8. 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.
Fri 6/125:24 pm
STL
- AEP
2 stops19h 26m
LATAM Airlines
Wed 6/179:25 am
AEP
- STL
2 stops26h 21m
LATAM Airlines
Deal found 4/8![LATAM Airlines logo]()
$1,335
This KAYAK deal was found by Cheapflights users on 4/8. 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.
Fri 6/125:24 pm
STL
- AEP
2 stops19h 26m
LATAM Airlines
Tue 6/163:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/8![LATAM Airlines logo]()
$1,335
This KAYAK deal was found by Cheapflights users on 4/8. 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.
Fri 6/125:24 pm
STL
- AEP
2 stops19h 26m
LATAM Airlines
Thu 6/182:55 pm
AEP
- STL
2 stops20h 51m
LATAM Airlines
Deal found 4/8![LATAM Airlines logo]()
$1,335
This LATAM Airlines deal was found by Cheapflights users on 4/8. 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.
Tue 6/26:00 am
STL
- AEP
2 stops23h 40m
LATAM Airlines
Thu 6/45:00 pm
AEP
- STL
2 stops21h 20m
LATAM Airlines
Deal found 4/8![LATAM Airlines logo]()
$1,517
This BusinessClass deal was found by Cheapflights users on 4/4. 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.
Wed 4/296:50 pm
STL
- AEP
2 stops19h 10m
LATAM Airlines
Tue 5/53:45 pm
AEP
- STL
2 stops22h 11m
LATAM Airlines
Deal found 4/4![LATAM Airlines logo]()
$1,589
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 9, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 9, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/111:10 pm
EZE
- STL
2 stops30h 23m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$1,112
This LATAM Airlines deal was found by Cheapflights users on 4/6. 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 5/49:59 am
STL
- AEP
2 stops19h 41m
LATAM Airlines
Mon 5/116:20 pm
AEP
- STL
2 stops20h 02m
LATAM Airlines
Deal found 4/6![LATAM Airlines logo]()
$1,297
This Air Canada deal was found by Cheapflights users on 4/6. 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.
Wed 5/61:05 pm
STL
- EZE
2 stops23h 25m
Air Canada
Wed 6/174:35 pm
EZE
- STL
2 stops29h 50m
Air Canada
Deal found 4/6![Air Canada logo]()
$1,128
This Kiwi.com deal was found by Cheapflights users on 4/6. 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 5/66:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Tue 6/161:35 am
EZE
- STL
2 stops24h 39m
Multiple Airlines
Deal found 4/6![Multiple Airlines logo]()
$1,202
This Mytrip deal was found by Cheapflights users on 4/9. 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.
Thu 5/71:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Thu 5/144:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/9![Air Canada logo]()
$1,115
This Booking.com deal was found by Cheapflights users on 4/4. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/111:05 pm
STL
- EZE
3 stops47h 25m
Air Canada
Mon 5/184:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/4![Air Canada logo]()
$1,149
This Kiwi.com deal was found by Cheapflights users on 4/4. 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 5/114:19 pm
STL
- EZE
2 stops33h 26m
Multiple Airlines
Mon 5/188:25 am
EZE
- STL
1 stop32h 14m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$1,219
This KAYAK deal was found by Cheapflights users on 4/4. 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 5/1110:49 am
STL
- AEP
2 stops19h 41m
LATAM Airlines
Mon 5/182:55 pm
AEP
- STL
2 stops23h 27m
LATAM Airlines
Deal found 4/4![LATAM Airlines logo]()
$1,289
This Kiwi.com deal was found by Cheapflights users on 4/8. 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 5/166:00 am
STL
- EZE
1 stop20h 30m
Multiple Airlines
Sun 5/2411:25 pm
EZE
- STL
2 stops41h 14m
Multiple Airlines
Deal found 4/8![Multiple Airlines logo]()
$1,186
This Booking.com deal was found by Cheapflights users on 4/5. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/207:05 am
STL
- EZE
2 stops29h 25m
Air Canada
Wed 5/274:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 4/5![Air Canada logo]()
$1,200
This United Airlines deal was found by Cheapflights users on 4/8. 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 5/282:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Tue 6/99:00 pm
EZE
- STL
1 stop22h 42m
United Airlines
Deal found 4/8![United Airlines logo]()
$1,122
This KAYAK deal was found by Cheapflights users on 4/5. 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 5/2810:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Tue 6/92:55 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 4/5![LATAM Airlines logo]()
$1,139
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 9, 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 9, 2026.
This Kiwi.com deal was found by Cheapflights users on 4/4. 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 5/66:00 am
STL
- EZE
2 stops21h 40m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$510
This Kiwi.com deal was found by Cheapflights users on 4/4. 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 5/66:00 am
STL
- AEP
2 stops21h 40m
Multiple Airlines
Deal found 4/4![Multiple Airlines logo]()
$533
This Delta deal was found by Cheapflights users on 4/4. 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 5/61:03 pm
STL
- EZE
1 stop18h 42m
Delta
Deal found 4/4![Delta logo]()
$852
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 9, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,112 (Kiwi.com) |
One-way from | $510 (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 9, 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
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 5/28
11:10 am-8:00 am
1 stop18h 50m
Buenos Aires Ministro Pistarini
Tue 6/9
9:00 pm-10:07 am
1 stop15h 07m
$1,122
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 5/6
1:05 pm-2:30 pm
2 stops23h 25m
Buenos Aires Ministro Pistarini
Wed 6/17
4:35 pm-8:25 pm
2 stops29h 50m
$1,128
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 8/4
1:22 pm-9:30 pm
2 stops30h 08m
Buenos Aires Jorge Newbery
Tue 8/11
8:05 pm-10:41 am
2 stops16h 36m
$1,139
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 8/4
1:22 pm-7:40 pm
2 stops28h 18m
Buenos Aires Jorge Newbery
Thu 8/13
3:45 pm-6:02 pm
2 stops28h 17m
$1,139
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 5/28
10:49 am-7:40 am
2 stops18h 51m
Buenos Aires Jorge Newbery
Tue 6/9
2:55 pm-8:16 am
2 stops19h 21m
$1,139
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Wed 8/12
7:05 pm-5:00 pm
2 stops19h 55m
Buenos Aires Jorge Newbery
Thu 8/20
3:45 pm-10:41 am
2 stops20h 56m
$1,147
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 8/4
5:19 pm-4:00 pm
2 stops20h 41m
Buenos Aires Jorge Newbery
Fri 8/14
3:45 pm-4:55 pm
2 stops27h 10m
$1,187
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 5/6
6:00 am-7:30 pm
1 stop35h 30m
Buenos Aires Ministro Pistarini
Tue 6/16
1:35 am-12:14 am
2 stops24h 39m
$1,202
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 8/12
11:25 am-8:00 am
2 stops18h 35m
Buenos Aires Ministro Pistarini
Thu 8/20
9:00 pm-5:49 pm
1 stop22h 49m
$1,226
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 5/6
5:24 am-7:15 am
1 stop23h 51m
Buenos Aires Ministro Pistarini
Wed 6/17
10:35 pm-10:35 am
1 stop14h 00m
$1,249
Showing 1-10 of 22 resultsSorted by cheapest first
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- Most trusted provider: When it comes to deals on St. Louis-Buenos Aires flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Buenos Aires
Have a flexible travel schedule? Discover the best time to fly to Buenos Aires from St. Louis with our price prediction graph.
STL-BUE
STL-EZE
STL-AEP
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Buenos Aires
STL-BUE
STL-EZE
STL-AEP
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 9, 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.
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.9
Entertainment
7.8
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.9
Entertainment
7.8
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.9
Entertainment
7.8
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.9
Entertainment
7.8
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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Buenos Aires flight routes
Complete your trip
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Alternative routes for St. Louis to Buenos Aires
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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 April 9, 2026.
Complete your trip
Complete your trip to Buenos Aires by adding a car rental and/or hotel reservation to your travel itinerary.
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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 9, 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 9, 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 9, 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 |