$382+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)
This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/13. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
May 2 — May 91
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 2, 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 2, 2026.
This United Airlines deal was found by Cheapflights users on 4/2. 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 4/2![United Airlines logo]()
$1,122
This Trip.com deal was found by Cheapflights users on 3/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:15 pm
STL
- EZE
2 stops22h 15m
Air Canada
Wed 5/204:35 pm
EZE
- STL
2 stops21h 31m
Air Canada
Deal found 3/29![Air Canada logo]()
$1,123
This Ovago deal was found by Cheapflights users on 3/30. 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.
Mon 11/21:30 pm
STL
- EZE
1 stop16h 30m
LATAM Airlines
Mon 11/308:55 pm
EZE
- STL
1 stop14h 17m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$1,135
This KAYAK deal was found by Cheapflights users on 3/30. 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 stops19h 41m
LATAM Airlines
Tue 6/93:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 3/31. 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 stops19h 52m
LATAM Airlines
Thu 1/217:45 am
EZE
- STL
2 stops18h 54m
LATAM Airlines
Deal found 3/31![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 3/31. 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 stops19h 52m
LATAM Airlines
Sun 1/177:45 am
EZE
- STL
3 stops30h 03m
LATAM Airlines
Deal found 3/31![LATAM Airlines logo]()
$1,142
This KAYAK deal was found by Cheapflights users on 4/2. 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 12/101:30 pm
STL
- EZE
2 stops17h 10m
LATAM Airlines
Wed 1/207:45 am
EZE
- STL
2 stops18h 54m
LATAM Airlines
Deal found 4/2![LATAM Airlines logo]()
$1,143
This United Airlines deal was found by Cheapflights users on 4/2. 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 12/104:17 pm
STL
- EZE
1 stop14h 03m
United Airlines
Wed 1/2011:55 pm
EZE
- STL
1 stop18h 49m
United Airlines
Deal found 4/2![United Airlines logo]()
$1,147
This Delta deal was found by Cheapflights users on 4/2. 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 12/149:00 am
STL
- EZE
2 stops21h 40m
Delta
Mon 1/184:45 pm
EZE
- STL
2 stops18h 27m
Delta
Deal found 4/2![Delta logo]()
$1,151
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Wed 5/207:10 am
EZE
- STL
2 stops43h 11m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$1,161
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/306:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Thu 5/71:10 pm
EZE
- STL
2 stops45h 45m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$1,172
This KAYAK deal was found by Cheapflights users on 3/30. 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 11/27:05 pm
STL
- AEP
2 stops17h 55m
LATAM Airlines
Mon 11/302:55 pm
AEP
- STL
2 stops20h 17m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$1,289
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 2, 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 2, 2026.
This United Airlines deal was found by Cheapflights users on 4/2. 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 5/281:13 pm
STL
- EZE
2 stops16h 47m
United Airlines
Tue 6/99:00 pm
EZE
- STL
2 stops19h 23m
United Airlines
Deal found 4/2![United Airlines logo]()
$1,126
This KAYAK deal was found by Cheapflights users on 3/30. 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 stops19h 41m
LATAM Airlines
Tue 6/93:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$1,139
This Kiwi.com deal was found by Cheapflights users on 3/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Tue 5/1911:25 pm
EZE
- STL
2 stops41h 14m
Multiple Airlines
Deal found 3/28![Multiple Airlines logo]()
$1,181
This American Airlines deal was found by Cheapflights users on 3/28. 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.
Tue 5/122:33 pm
STL
- EZE
2 stops16h 17m
American Airlines
Tue 5/1910:20 pm
EZE
- STL
2 stops18h 52m
American Airlines
Deal found 3/28![American Airlines logo]()
$1,211
This Gotogate deal was found by Cheapflights users on 3/29. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/131:05 pm
STL
- EZE
3 stops23h 25m
Air Canada
Wed 5/204:35 pm
EZE
- STL
3 stops53h 50m
Air Canada
Deal found 3/29![Air Canada logo]()
$1,216
This Delta deal was found by Cheapflights users on 3/28. 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.
Tue 5/121:27 pm
STL
- AEP
2 stops18h 13m
Delta
Tue 5/198:05 pm
AEP
- STL
2 stops18h 15m
Delta
Deal found 3/28![Delta logo]()
$1,297
This United Airlines deal was found by Cheapflights users on 4/2. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/178:30 pm
STL
- EZE
2 stops33h 30m
United Airlines
Sun 5/249:00 pm
EZE
- STL
2 stops37h 41m
United Airlines
Deal found 4/2![United Airlines logo]()
$1,266
This KAYAK deal was found by Cheapflights users on 3/29. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/284:41 pm
STL
- EZE
1 stop15h 04m
LATAM Airlines
Tue 5/58:10 pm
EZE
- STL
1 stop16h 24m
LATAM Airlines
Deal found 3/29![LATAM Airlines logo]()
$1,277
This Delta deal was found by Cheapflights users on 3/28. 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.
Tue 5/126:57 pm
STL
- EZE
1 stop12h 48m
Delta
Tue 5/198:10 pm
EZE
- STL
1 stop15h 34m
Delta
Deal found 3/28![Delta logo]()
$1,297
This LATAM Airlines deal was found by Cheapflights users on 3/28. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/205:30 pm
STL
- AEP
2 stops23h 00m
LATAM Airlines
Mon 8/248:40 am
AEP
- STL
2 stops35h 22m
LATAM Airlines
Deal found 3/28![LATAM Airlines logo]()
$1,293
This United Airlines deal was found by Cheapflights users on 3/29. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 4/154:49 pm
STL
- EZE
1 stop13h 11m
United Airlines
Fri 6/129:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 3/29![United Airlines logo]()
$1,317
This LATAM Airlines deal was found by Cheapflights users on 3/29. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/131:27 pm
STL
- AEP
2 stops18h 13m
LATAM Airlines
Wed 5/208:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 3/29![LATAM Airlines logo]()
$1,293
This Mytrip deal was found by Cheapflights users on 3/28. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/122:15 pm
STL
- AEP
2 stops21h 05m
Multiple Airlines
Tue 5/197:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 3/28![Multiple Airlines logo]()
$1,616
This Delta deal was found by Cheapflights users on 4/1. 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 5/229:13 am
STL
- AEP
2 stops20h 27m
Delta
Sat 5/308:05 pm
AEP
- STL
2 stops22h 05m
Delta
Deal found 4/1![Delta logo]()
$1,527
This FlightHub deal was found by Cheapflights users on 3/31. 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 4/3011:42 am
STL
- AEP
2 stops17h 58m
LATAM Airlines
Thu 5/72:55 pm
AEP
- STL
2 stops19h 15m
LATAM Airlines
Deal found 3/31![LATAM Airlines logo]()
$1,396
This lastminute.com deal was found by Cheapflights users on 4/1. 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 lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 5/165:15 pm
STL
- AEP
2 stops19h 35m
LATAM Airlines
Sat 5/235:35 pm
AEP
- STL
2 stops26h 25m
LATAM Airlines
Deal found 4/1![LATAM Airlines logo]()
$1,464
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 2, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 2, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 3/31. 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 4/306:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Thu 5/71:10 pm
EZE
- STL
2 stops45h 45m
Multiple Airlines
Deal found 3/31![Multiple Airlines logo]()
$1,172
This Kiwi.com deal was found by Cheapflights users on 3/28. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/126:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Tue 5/1911:25 pm
EZE
- STL
2 stops41h 14m
Multiple Airlines
Deal found 3/28![Multiple Airlines logo]()
$1,181
This American Airlines deal was found by Cheapflights users on 3/28. 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.
Tue 5/122:33 pm
STL
- EZE
2 stops16h 17m
American Airlines
Tue 5/1910:20 pm
EZE
- STL
2 stops18h 52m
American Airlines
Deal found 3/28![American Airlines logo]()
$1,211
This Delta deal was found by Cheapflights users on 3/28. 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.
Tue 5/121:27 pm
STL
- AEP
2 stops18h 13m
Delta
Tue 5/198:05 pm
AEP
- STL
2 stops18h 15m
Delta
Deal found 3/28![Delta logo]()
$1,297
This Trip.com deal was found by Cheapflights users on 3/29. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/132:15 pm
STL
- EZE
2 stops22h 15m
Air Canada
Wed 5/204:35 pm
EZE
- STL
2 stops21h 31m
Air Canada
Deal found 3/29![Air Canada logo]()
$1,123
This Kiwi.com deal was found by Cheapflights users on 3/29. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/136:00 am
STL
- EZE
1 stop35h 30m
Multiple Airlines
Wed 5/207:10 am
EZE
- STL
2 stops43h 11m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$1,161
This American Airlines deal was found by Cheapflights users on 3/29. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/1311:06 am
STL
- EZE
1 stop17h 09m
American Airlines
Wed 5/208:35 pm
EZE
- STL
1 stop15h 59m
American Airlines
Deal found 3/29![American Airlines logo]()
$1,210
This LATAM Airlines deal was found by Cheapflights users on 3/29. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/131:27 pm
STL
- AEP
2 stops18h 13m
LATAM Airlines
Wed 5/208:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 3/29![LATAM Airlines logo]()
$1,293
This Mytrip deal was found by Cheapflights users on 3/29. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/137:05 am
STL
- AEP
3 stops35h 55m
Multiple Airlines
Wed 5/201:40 pm
AEP
- STL
2 stops32h 45m
Multiple Airlines
Deal found 3/29![Multiple Airlines logo]()
$1,310
This United Airlines deal was found by Cheapflights users on 4/2. 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 4/2![United Airlines logo]()
$1,122
This KAYAK deal was found by Cheapflights users on 3/30. 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 stops19h 41m
LATAM Airlines
Tue 6/93:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$1,139
This KAYAK deal was found by Cheapflights users on 3/30. 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
- EZE
2 stops17h 21m
LATAM Airlines
Tue 6/97:35 am
EZE
- STL
2 stops18h 21m
LATAM Airlines
Deal found 3/30![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 2, 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 2, 2026.
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 4/138:41 am
STL
- AEP
3 stops24h 39m
Multiple Airlines
Deal found 3/30![Multiple Airlines logo]()
$382
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 stops55h 56m
Multiple Airlines
Deal found 4/1![Multiple Airlines logo]()
$404
This Kiwi.com deal was found by Cheapflights users on 3/30. 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 4/138:19 pm
STL
- EZE
3 stops31h 21m
Multiple Airlines
Deal found 3/30![Multiple Airlines logo]()
$434
This Kiwi.com deal was found by Cheapflights users on 4/1. 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 6/63:27 pm
STL
- AEP
3 stops36h 13m
Multiple Airlines
Deal found 4/1![Multiple Airlines logo]()
$477
This American Airlines deal was found by Cheapflights users on 4/1. 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.
Sat 6/66:24 pm
STL
- EZE
1 stop12h 26m
American Airlines
Deal found 4/1![American Airlines logo]()
$838
This Gurufare deal was found by Cheapflights users on 3/30. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/1311:42 am
STL
- EZE
1 stop20h 03m
LATAM Airlines
Deal found 3/30![LATAM Airlines logo]()
$896
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 2, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,087 (Booking.com) |
One-way from | $382 (Kiwi.com) |
Popular in | November |
Cheapest in | September |
Average price | $1,236 |
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 2, 2026.
Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.
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Cheapest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 5/28
1:13 pm-8:00 am
2 stops16h 47m
Buenos Aires Ministro Pistarini
Tue 6/9
9:00 pm-2:23 pm
2 stops19h 23m
$1,126
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 5/28
10:49 am-8:30 am
2 stops19h 41m
Buenos Aires Jorge Newbery
Tue 6/9
3:45 pm-9:46 am
2 stops20h 01m
$1,139
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 5/12
6:00 am-7:30 pm
1 stop35h 30m
Buenos Aires Ministro Pistarini
Tue 5/19
11:25 pm-2:39 pm
2 stops41h 14m
$1,181
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 5/12
2:33 pm-8:50 am
2 stops16h 17m
Buenos Aires Ministro Pistarini
Tue 5/19
10:20 pm-3:12 pm
2 stops18h 52m
$1,211
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 5/13
1:05 pm-2:30 pm
3 stops23h 25m
Buenos Aires Ministro Pistarini
Wed 5/20
4:35 pm-8:25 pm
3 stops53h 50m
$1,216
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Sun 5/17
8:30 pm-8:00 am
2 stops33h 30m
Buenos Aires Ministro Pistarini
Sun 5/24
9:00 pm-8:41 am
2 stops37h 41m
$1,266
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 4/28
4:41 pm-9:45 am
1 stop15h 04m
Buenos Aires Ministro Pistarini
Tue 5/5
8:10 pm-10:34 am
1 stop16h 24m
$1,277
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 8/20
5:30 pm-6:30 pm
2 stops23h 00m
Buenos Aires Jorge Newbery
Mon 8/24
8:40 am-6:02 pm
2 stops35h 22m
$1,293
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Wed 5/13
1:27 pm-9:40 am
2 stops18h 13m
Buenos Aires Jorge Newbery
Wed 5/20
8:05 pm-12:20 pm
2 stops18h 15m
$1,293
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 5/12
1:27 pm-9:40 am
2 stops18h 13m
Buenos Aires Jorge Newbery
Tue 5/19
8:05 pm-12:20 pm
2 stops18h 15m
$1,297
Showing 1-10 of 21 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-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 2, 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.
Food
7.2
Comfort
7.9
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Comfort
7.9
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Comfort
7.9
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Food
7.2
Comfort
7.9
Entertainment
7.8
Boarding
8.1
Crew
8.5
Overall
7.9
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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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 2, 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 2, 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 2, 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 2, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,100 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,295 | FlexibilityNo cancel fee | On-timeN/A |