$1,147+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/11. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Jun 27 — Jul 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
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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Best
Last-minute
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 May 28, 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 May 28, 2026.
This United Airlines deal was found by Cheapflights users on 5/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1111:15 am
STL
- EZE
1 stop18h 45m
United Airlines
Tue 8/189:00 pm
EZE
- STL
1 stop15h 10m
United Airlines
Deal found 5/27![United Airlines logo]()
$1,147
This LATAM Airlines deal was found by Cheapflights users on 5/27. 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.
Tue 8/116:00 am
STL
- EZE
2 stops22h 10m
LATAM Airlines
Tue 8/187:35 am
EZE
- STL
3 stops36h 52m
LATAM Airlines
Deal found 5/27![LATAM Airlines logo]()
$1,150
This Mytrip deal was found by Cheapflights users on 5/23. 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 5/282:15 pm
STL
- EZE
3 stops33h 05m
Multiple Airlines
Thu 6/117:10 am
EZE
- STL
3 stops30h 56m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,190
This Delta deal was found by Cheapflights users on 5/26. 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.
Fri 9/186:45 pm
STL
- EZE
1 stop13h 00m
Delta
Fri 9/258:10 pm
EZE
- STL
1 stop22h 31m
Delta
Deal found 5/26![Delta logo]()
$1,227
This Mytrip deal was found by Cheapflights users on 5/23. 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 5/262:15 pm
STL
- EZE
2 stops32h 10m
Multiple Airlines
Tue 6/97:10 am
EZE
- STL
3 stops30h 56m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,323
This Mytrip deal was found by Cheapflights users on 5/23. 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 6/108:40 am
STL
- EZE
3 stops29h 00m
Multiple Airlines
Tue 6/237:10 am
EZE
- STL
3 stops31h 11m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,329
This Delta deal was found by Cheapflights users on 5/26. 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.
Fri 9/184:59 pm
STL
- AEP
2 stops19h 51m
Delta
Fri 9/258:05 pm
AEP
- STL
2 stops20h 44m
Delta
Deal found 5/26![Delta logo]()
$1,335
This United Airlines deal was found by Cheapflights users on 5/27. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:00 am
STL
- EZE
1 stop17h 20m
United Airlines
Mon 12/711:55 pm
EZE
- STL
1 stop19h 40m
United Airlines
Deal found 5/27![United Airlines logo]()
$1,343
This LATAM Airlines deal was found by Cheapflights users on 5/26. 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.
Fri 7/310:51 am
STL
- AEP
2 stops18h 49m
LATAM Airlines
Fri 7/106:20 pm
AEP
- STL
2 stops20h 10m
LATAM Airlines
Deal found 5/26![LATAM Airlines logo]()
$1,377
This KAYAK deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:57 pm
STL
- AEP
2 stops19h 03m
LATAM Airlines
Tue 6/95:00 pm
AEP
- STL
2 stops21h 34m
LATAM Airlines
Deal found 5/23![LATAM Airlines logo]()
$1,457
This Mytrip deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/261:05 pm
STL
- AEP
2 stops25h 00m
Multiple Airlines
Tue 6/97:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,474
This Mytrip deal was found by Cheapflights users on 5/23. 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 6/21:05 pm
STL
- AEP
3 stops27h 20m
Multiple Airlines
Tue 6/167:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,506
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 May 28, 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 May 28, 2026.
This United Airlines deal was found by Cheapflights users on 5/24. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/113:13 pm
STL
- EZE
1 stop14h 47m
United Airlines
Tue 8/189:00 pm
EZE
- STL
1 stop15h 10m
United Airlines
Deal found 5/24![United Airlines logo]()
$1,147
This Delta deal was found by Cheapflights users on 5/24. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
STL
- EZE
2 stops22h 10m
Delta
Tue 8/188:10 pm
EZE
- STL
1 stop15h 44m
Delta
Deal found 5/24![Delta logo]()
$1,147
This LATAM Airlines deal was found by Cheapflights users on 5/24. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/116:00 am
STL
- EZE
2 stops22h 10m
LATAM Airlines
Tue 8/1812:15 pm
EZE
- STL
2 stops32h 12m
LATAM Airlines
Deal found 5/24![LATAM Airlines logo]()
$1,147
This Mytrip deal was found by Cheapflights users on 5/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/32:40 pm
STL
- AEP
3 stops28h 20m
Multiple Airlines
Fri 7/107:00 am
AEP
- STL
3 stops33h 02m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$1,808
This Delta deal was found by Cheapflights users on 5/26. 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.
Fri 9/186:45 pm
STL
- EZE
1 stop13h 00m
Delta
Fri 9/258:10 pm
EZE
- STL
1 stop22h 31m
Delta
Deal found 5/26![Delta logo]()
$1,227
This LATAM Airlines deal was found by Cheapflights users on 5/26. 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.
Fri 7/106:58 pm
STL
- AEP
2 stops20h 02m
LATAM Airlines
Fri 7/173:45 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 5/26![LATAM Airlines logo]()
$1,377
This United Airlines deal was found by Cheapflights users on 5/26. 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.
Fri 7/107:05 pm
STL
- EZE
2 stops34h 55m
United Airlines
Fri 7/179:00 pm
EZE
- STL
2 stops50h 26m
United Airlines
Deal found 5/26![United Airlines logo]()
$1,400
This Delta deal was found by Cheapflights users on 5/26. 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.
Fri 9/184:59 pm
STL
- AEP
2 stops19h 51m
Delta
Fri 9/258:05 pm
AEP
- STL
2 stops20h 44m
Delta
Deal found 5/26![Delta logo]()
$1,335
This LATAM Airlines deal was found by Cheapflights users on 5/23. 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 6/1610:51 am
STL
- AEP
2 stops27h 09m
LATAM Airlines
Thu 6/183:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 5/23![LATAM Airlines logo]()
$1,571
This LATAM Airlines deal was found by Cheapflights users on 5/24. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/163:57 pm
STL
- EZE
2 stops17h 33m
LATAM Airlines
Thu 6/187:35 am
EZE
- STL
3 stops28h 11m
LATAM Airlines
Deal found 5/24![LATAM Airlines logo]()
$1,585
This Mytrip deal was found by Cheapflights users on 5/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:40 am
STL
- AEP
3 stops34h 20m
Multiple Airlines
Sun 6/141:30 pm
AEP
- STL
3 stops32h 55m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$2,055
This KAYAK deal was found by Cheapflights users on 5/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/123:57 pm
STL
- AEP
2 stops20h 53m
LATAM Airlines
Sun 6/145:35 pm
AEP
- STL
2 stops20h 59m
LATAM Airlines
Deal found 5/27![LATAM Airlines logo]()
$1,799
This Mytrip deal was found by Cheapflights users on 5/26. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/108:55 am
STL
- AEP
3 stops30h 25m
Multiple Airlines
Fri 7/171:40 pm
AEP
- STL
2 stops26h 22m
Multiple Airlines
Deal found 5/26![Multiple Airlines logo]()
$2,189
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated May 28, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated May 28, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 5/23. 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 5/282:15 pm
STL
- EZE
3 stops33h 05m
Multiple Airlines
Thu 6/117:10 am
EZE
- STL
3 stops30h 56m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,190
This Ovago deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 5/287:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Thu 6/118:10 pm
EZE
- STL
1 stop14h 06m
LATAM Airlines
Deal found 5/23![LATAM Airlines logo]()
$1,454
This Mytrip deal was found by Cheapflights users on 5/23. 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 5/287:05 am
STL
- AEP
2 stops31h 00m
Multiple Airlines
Thu 6/111:40 pm
AEP
- STL
2 stops32h 45m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,662
This Mytrip deal was found by Cheapflights users on 5/23. 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 6/22:15 pm
STL
- EZE
3 stops31h 50m
Multiple Airlines
Tue 6/167:10 am
EZE
- STL
3 stops30h 56m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,411
This KAYAK deal was found by Cheapflights users on 5/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/25:15 pm
STL
- AEP
2 stops20h 45m
LATAM Airlines
Tue 6/162:55 pm
AEP
- STL
2 stops23h 39m
LATAM Airlines
Deal found 5/23![LATAM Airlines logo]()
$1,457
This LATAM Airlines deal was found by Cheapflights users on 5/23. 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 6/25:15 pm
STL
- EZE
1 stop14h 30m
LATAM Airlines
Tue 6/168:10 pm
EZE
- STL
1 stop15h 36m
LATAM Airlines
Deal found 5/23![LATAM Airlines logo]()
$1,457
This Mytrip deal was found by Cheapflights users on 5/23. 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 6/21:05 pm
STL
- AEP
3 stops27h 20m
Multiple Airlines
Tue 6/167:00 am
AEP
- STL
3 stops31h 06m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,506
This Mytrip deal was found by Cheapflights users on 5/23. 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 6/108:40 am
STL
- EZE
3 stops29h 00m
Multiple Airlines
Tue 6/237:10 am
EZE
- STL
3 stops31h 11m
Multiple Airlines
Deal found 5/23![Multiple Airlines logo]()
$1,329
This KAYAK deal was found by Cheapflights users on 5/23. 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 6/108:35 am
STL
- EZE
1 stop21h 25m
Avianca
Tue 6/239:00 pm
EZE
- STL
1 stop15h 07m
Avianca
Deal found 5/23![Avianca logo]()
$1,376
This KAYAK deal was found by Cheapflights users on 5/27. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/123:57 pm
STL
- AEP
2 stops20h 53m
LATAM Airlines
Sun 6/145:35 pm
AEP
- STL
2 stops20h 59m
LATAM Airlines
Deal found 5/27![LATAM Airlines logo]()
$1,799
This Mytrip deal was found by Cheapflights users on 5/27. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 6/128:40 am
STL
- AEP
3 stops34h 20m
Multiple Airlines
Sun 6/141:30 pm
AEP
- STL
3 stops32h 55m
Multiple Airlines
Deal found 5/27![Multiple Airlines logo]()
$2,055
This LATAM Airlines deal was found by Cheapflights users on 5/24. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/161:39 pm
STL
- AEP
2 stops24h 21m
LATAM Airlines
Thu 6/189:25 am
AEP
- STL
2 stops26h 21m
LATAM Airlines
Deal found 5/24![LATAM Airlines logo]()
$1,571
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 May 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,147 (LATAM Airlines) |
Popular in | May |
Cheapest in | September |
Average price | $1,645 |
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 May 28, 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
Tue 8/11
3:13 pm-8:00 am
1 stop14h 47m
Buenos Aires Ministro Pistarini
Tue 8/18
9:00 pm-10:10 am
1 stop15h 10m
$1,147
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 8/11
6:00 am-6:10 am
2 stops22h 10m
Buenos Aires Ministro Pistarini
Tue 8/18
8:10 pm-9:54 am
1 stop15h 44m
$1,147
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 8/11
6:00 am-6:10 am
2 stops22h 10m
Buenos Aires Ministro Pistarini
Tue 8/18
12:15 pm-6:27 pm
2 stops32h 12m
$1,147
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Fri 9/18
6:45 pm-9:45 am
1 stop13h 00m
Buenos Aires Ministro Pistarini
Fri 9/25
8:10 pm-4:41 pm
1 stop22h 31m
$1,227
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Fri 9/18
4:59 pm-2:50 pm
2 stops19h 51m
Buenos Aires Jorge Newbery
Fri 9/25
8:05 pm-2:49 pm
2 stops20h 44m
$1,335
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Fri 7/10
6:58 pm-5:00 pm
2 stops20h 02m
Buenos Aires Jorge Newbery
Fri 7/17
3:45 pm-9:06 am
2 stops19h 21m
$1,377
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Fri 7/10
7:05 pm-8:00 am
2 stops34h 55m
Buenos Aires Ministro Pistarini
Fri 7/17
9:00 pm-9:26 pm
2 stops50h 26m
$1,400
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 6/16
10:51 am-4:00 pm
2 stops27h 09m
Buenos Aires Jorge Newbery
Thu 6/18
3:45 pm-9:46 am
2 stops20h 01m
$1,571
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 6/16
3:57 pm-11:30 am
2 stops17h 33m
Buenos Aires Ministro Pistarini
Thu 6/18
7:35 am-9:46 am
3 stops28h 11m
$1,585
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Fri 6/12
3:57 pm-2:50 pm
2 stops20h 53m
Buenos Aires Jorge Newbery
Sun 6/14
5:35 pm-12:34 pm
2 stops20h 59m
$1,799
Showing 1-10 of 13 resultsSorted by cheapest first
- Most accurate provider: When it comes to deals on St. Louis-Buenos Aires flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on St. Louis-Buenos Aires flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from St. Louis-Buenos Aires flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on St. Louis-Buenos Aires flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for St. Louis-Buenos Aires flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from St. Louis to Buenos Aires
Have a flexible travel schedule? Discover the best time to fly to Buenos Aires from St. Louis with our price prediction graph.
STL-BUE
STL-EZE
STL-AEP
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from St. Louis to Buenos Aires
STL-BUE
STL-EZE
STL-AEP
What is the cheapest month to book a flight from St. Louis to Buenos Aires?
Currently, October is the cheapest month in which you can book a flight from St. Louis to Buenos Aires (average of $829). Flying from St. Louis to Buenos Aires in August is currently the most expensive (average of $1,365). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
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 May 28, 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.
Entertainment
7.8
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Entertainment
7.8
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Entertainment
7.8
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Entertainment
7.8
Overall
7.9
Crew
8.5
Boarding
8.1
Food
7.2
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Buenos Aires. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Browse thousands of different options on Cheapflights for your next trip
Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.
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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 May 28, 2026.
Complete your trip
Complete your trip to Buenos Aires by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from St. Louis to Buenos Aires by cabin class
Find flights from St. Louis to Buenos Aires, based on your preferred cabin class, be it economy, premium economy, business, or first class.
St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on May 28, 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 May 28, 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 May 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,109 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,377 | FlexibilityNo cancel fee | On-timeN/A |