$433+ 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
Apr 3 — Apr 101
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
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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 March 4, 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 March 4, 2026.
This Ovago deal was found by Cheapflights users on 3/1. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:18 pm
STL
- EZE
2 stops17h 02m
LATAM Airlines
Tue 6/308:10 pm
EZE
- STL
1 stop21h 48m
LATAM Airlines
Deal found 3/1![LATAM Airlines logo]()
$1,034
This Gurufare deal was found by Cheapflights users on 3/1. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/231:30 pm
STL
- AEP
2 stops18h 10m
LATAM Airlines
Tue 6/303:45 pm
AEP
- STL
2 stops23h 09m
LATAM Airlines
Deal found 3/1![LATAM Airlines logo]()
$1,047
This Ovago deal was found by Cheapflights users on 3/2. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/157:05 pm
STL
- EZE
1 stop12h 40m
LATAM Airlines
Thu 10/298:55 pm
EZE
- STL
1 stop23h 06m
LATAM Airlines
Deal found 3/2![LATAM Airlines logo]()
$1,077
This KAYAK deal was found by Cheapflights users on 2/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/36:00 am
STL
- EZE
2 stops21h 05m
LATAM Airlines
Sat 12/124:45 pm
EZE
- STL
2 stops18h 27m
LATAM Airlines
Deal found 2/28![LATAM Airlines logo]()
$1,079
This KAYAK deal was found by Cheapflights users on 3/2. 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 10/157:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
Thu 10/2912:40 pm
AEP
- STL
2 stops24h 08m
LATAM Airlines
Deal found 3/2![LATAM Airlines logo]()
$1,081
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:00 am
STL
- EZE
1 stop17h 20m
United Airlines
Sat 12/1210:05 pm
EZE
- STL
1 stop14h 37m
United Airlines
Deal found 2/28![United Airlines logo]()
$1,087
This KAYAK deal was found by Cheapflights users on 3/4. 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 12/149:00 am
STL
- EZE
2 stops21h 40m
LATAM Airlines
Wed 1/203:35 pm
EZE
- STL
2 stops19h 37m
LATAM Airlines
Deal found 3/4![LATAM Airlines logo]()
$1,093
This Delta deal was found by Cheapflights users on 3/4. 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.
Mon 12/141:30 pm
STL
- EZE
2 stops17h 10m
Delta
Thu 1/2110:25 pm
EZE
- STL
1 stop21h 41m
Delta
Deal found 3/4![Delta logo]()
$1,101
This Ovago deal was found by Cheapflights users on 2/28. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/187:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Thu 5/218:10 pm
EZE
- STL
1 stop15h 34m
LATAM Airlines
Deal found 2/28![LATAM Airlines logo]()
$1,119
This United Airlines deal was found by Cheapflights users on 2/27. 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.
Mon 4/1310:00 am
STL
- EZE
2 stops20h 00m
United Airlines
Mon 4/209:00 pm
EZE
- STL
1 stop14h 25m
United Airlines
Deal found 2/27![United Airlines logo]()
$1,122
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:15 am
STL
- EZE
2 stops18h 45m
United Airlines
Tue 4/219:00 pm
EZE
- STL
2 stops17h 22m
United Airlines
Deal found 2/28![United Airlines logo]()
$1,126
This LATAM Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:50 pm
STL
- AEP
2 stops21h 40m
LATAM Airlines
Mon 5/45:35 pm
AEP
- STL
2 stops18h 59m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,143
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 March 4, 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 March 4, 2026.
This Ovago deal was found by Cheapflights users on 3/1. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/232:18 pm
STL
- EZE
2 stops17h 02m
LATAM Airlines
Tue 6/308:10 pm
EZE
- STL
1 stop21h 48m
LATAM Airlines
Deal found 3/1![LATAM Airlines logo]()
$1,034
This United Airlines deal was found by Cheapflights users on 2/27. 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.
Mon 4/1310:00 am
STL
- EZE
2 stops20h 00m
United Airlines
Mon 4/209:00 pm
EZE
- STL
1 stop14h 25m
United Airlines
Deal found 2/27![United Airlines logo]()
$1,122
This Gurufare deal was found by Cheapflights users on 3/1. 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 Gurufare is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/231:30 pm
STL
- AEP
2 stops18h 10m
LATAM Airlines
Tue 6/303:45 pm
AEP
- STL
2 stops23h 09m
LATAM Airlines
Deal found 3/1![LATAM Airlines logo]()
$1,047
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1410:09 am
STL
- EZE
1 stop19h 51m
United Airlines
Tue 4/219:00 pm
EZE
- STL
1 stop21h 08m
United Airlines
Deal found 2/28![United Airlines logo]()
$1,122
This United Airlines deal was found by Cheapflights users on 3/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3110:00 am
STL
- EZE
2 stops20h 00m
United Airlines
Thu 5/79:00 pm
EZE
- STL
1 stop27h 30m
United Airlines
Deal found 3/1![United Airlines logo]()
$1,135
This LATAM Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:50 pm
STL
- AEP
2 stops21h 40m
LATAM Airlines
Mon 5/45:35 pm
AEP
- STL
2 stops18h 59m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,143
This LATAM Airlines deal was found by Cheapflights users on 2/28. 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.
Mon 5/187:01 pm
STL
- AEP
2 stops19h 59m
LATAM Airlines
Thu 5/213:45 pm
AEP
- STL
2 stops19h 59m
LATAM Airlines
Deal found 2/28![LATAM Airlines logo]()
$1,143
This United Airlines deal was found by Cheapflights users on 3/3. 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 4/1411:15 am
STL
- EZE
2 stops18h 45m
United Airlines
Thu 4/239:00 pm
EZE
- STL
2 stops20h 48m
United Airlines
Deal found 3/3![United Airlines logo]()
$1,176
This LATAM Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:59 am
STL
- EZE
1 stop21h 46m
LATAM Airlines
Mon 5/48:10 pm
EZE
- STL
1 stop16h 24m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,143
This LATAM Airlines deal was found by Cheapflights users on 2/27. 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.
Mon 4/134:41 pm
STL
- AEP
2 stops21h 19m
LATAM Airlines
Mon 4/205:05 pm
AEP
- STL
2 stops19h 29m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,197
This LATAM Airlines deal was found by Cheapflights users on 2/28. 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.
Tue 4/146:50 pm
STL
- AEP
2 stops19h 10m
LATAM Airlines
Tue 4/213:45 pm
AEP
- STL
2 stops20h 49m
LATAM Airlines
Deal found 2/28![LATAM Airlines logo]()
$1,197
This LATAM Airlines deal was found by Cheapflights users on 3/2. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
Mon 4/65:05 pm
AEP
- STL
2 stops20h 04m
LATAM Airlines
Deal found 3/2![LATAM Airlines logo]()
$1,197
This KAYAK deal was found by Cheapflights users on 3/3. 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 4/146:50 pm
STL
- AEP
2 stops19h 10m
LATAM Airlines
Thu 4/233:45 pm
AEP
- STL
2 stops18h 45m
LATAM Airlines
Deal found 3/3![LATAM Airlines logo]()
$1,239
This Billigflug deal was found by Cheapflights users on 3/4. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:42 am
STL
- AEP
2 stops17h 58m
LATAM Airlines
Sat 4/258:40 am
AEP
- STL
2 stops25h 50m
LATAM Airlines
Deal found 3/4![LATAM Airlines logo]()
$1,409
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated March 4, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated March 4, 2026 and is based on user searches.
This Air Canada deal was found by Cheapflights users on 2/28. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 3/84:05 pm
STL
- AEP
2 stops21h 35m
Multiple Airlines
Tue 3/173:45 pm
AEP
- STL
2 stops25h 44m
Multiple Airlines
Deal found 2/28![Multiple Airlines logo]()
$2,351
This Ovago deal was found by Cheapflights users on 3/2. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/304:21 pm
STL
- EZE
1 stop15h 24m
LATAM Airlines
Mon 4/68:10 pm
EZE
- STL
1 stop16h 59m
LATAM Airlines
Deal found 3/2![LATAM Airlines logo]()
$1,172
This LATAM Airlines deal was found by Cheapflights users on 3/2. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/306:59 pm
STL
- AEP
2 stops19h 01m
LATAM Airlines
Mon 4/65:05 pm
AEP
- STL
2 stops20h 04m
LATAM Airlines
Deal found 3/2![LATAM Airlines logo]()
$1,197
This United Airlines deal was found by Cheapflights users on 3/1. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/3110:10 am
STL
- EZE
1 stop19h 50m
United Airlines
Thu 5/79:00 pm
EZE
- STL
1 stop27h 30m
United Airlines
Deal found 3/1![United Airlines logo]()
$1,131
This Air Canada deal was found by Cheapflights users on 3/1. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 3/314:05 pm
STL
- EZE
2 stops20h 25m
Air Canada
Thu 5/74:35 pm
EZE
- STL
2 stops29h 50m
Air Canada
Deal found 3/1![Air Canada logo]()
$1,142
This United Airlines deal was found by Cheapflights users on 2/27. 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.
Mon 4/1310:00 am
STL
- EZE
2 stops20h 00m
United Airlines
Mon 4/209:00 pm
EZE
- STL
1 stop14h 25m
United Airlines
Deal found 2/27![United Airlines logo]()
$1,122
This United Airlines deal was found by Cheapflights users on 2/28. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/1411:15 am
STL
- EZE
2 stops18h 45m
United Airlines
Tue 4/219:00 pm
EZE
- STL
2 stops17h 22m
United Airlines
Deal found 2/28![United Airlines logo]()
$1,126
This United Airlines deal was found by Cheapflights users on 3/3. 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 4/1411:15 am
STL
- EZE
2 stops18h 45m
United Airlines
Thu 4/239:00 pm
EZE
- STL
2 stops20h 48m
United Airlines
Deal found 3/3![United Airlines logo]()
$1,176
This KAYAK deal was found by Cheapflights users on 3/3. 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 4/146:50 pm
STL
- AEP
2 stops19h 10m
LATAM Airlines
Thu 4/233:45 pm
AEP
- STL
2 stops18h 45m
LATAM Airlines
Deal found 3/3![LATAM Airlines logo]()
$1,239
This Billigflug deal was found by Cheapflights users on 3/4. 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 Billigflug is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 4/1811:42 am
STL
- AEP
2 stops17h 58m
LATAM Airlines
Sat 4/258:40 am
AEP
- STL
2 stops25h 50m
LATAM Airlines
Deal found 3/4![LATAM Airlines logo]()
$1,409
This LATAM Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/306:50 pm
STL
- AEP
2 stops21h 40m
LATAM Airlines
Mon 5/45:35 pm
AEP
- STL
2 stops18h 59m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,143
This LATAM Airlines deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/309:59 am
STL
- EZE
1 stop21h 46m
LATAM Airlines
Mon 5/48:10 pm
EZE
- STL
1 stop16h 24m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$1,143
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 March 4, 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 March 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 2/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/138:41 am
STL
- EZE
3 stops24h 49m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$433
This Booking.com deal was found by Cheapflights users on 2/27. 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 Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/134:05 pm
STL
- AEP
2 stops27h 35m
Multiple Airlines
Deal found 2/27![Multiple Airlines logo]()
$615
This Ovago deal was found by Cheapflights users on 2/27. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 4/136:50 pm
STL
- EZE
1 stop12h 55m
LATAM Airlines
Deal found 2/27![LATAM Airlines logo]()
$751
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 March 4, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,034 (Ovago) |
One-way from | $433 (Kiwi.com) |
Popular in | June |
Cheapest in | September |
Average price | $1,211 |
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 March 4, 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
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 6/23
2:18 pm-9:20 am
2 stops17h 02m
Buenos Aires Ministro Pistarini
Tue 6/30
8:10 pm-3:58 pm
1 stop21h 48m
$1,034
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 6/23
1:30 pm-9:40 am
2 stops18h 10m
Buenos Aires Jorge Newbery
Tue 6/30
3:45 pm-12:54 pm
2 stops23h 09m
$1,047
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 4/13
10:00 am-8:00 am
2 stops20h 00m
Buenos Aires Ministro Pistarini
Mon 4/20
9:00 pm-9:25 am
1 stop14h 25m
$1,122
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 4/14
10:09 am-8:00 am
1 stop19h 51m
Buenos Aires Ministro Pistarini
Tue 4/21
9:00 pm-4:08 pm
1 stop21h 08m
$1,122
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 3/31
10:00 am-8:00 am
2 stops20h 00m
Buenos Aires Ministro Pistarini
Thu 5/7
9:00 pm-10:30 pm
1 stop27h 30m
$1,135
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 4/30
6:50 pm-6:30 pm
2 stops21h 40m
Buenos Aires Jorge Newbery
Mon 5/4
5:35 pm-10:34 am
2 stops18h 59m
$1,143
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 5/18
7:01 pm-5:00 pm
2 stops19h 59m
Buenos Aires Jorge Newbery
Thu 5/21
3:45 pm-9:44 am
2 stops19h 59m
$1,143
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 4/30
9:59 am-9:45 am
1 stop21h 46m
Buenos Aires Ministro Pistarini
Mon 5/4
8:10 pm-10:34 am
1 stop16h 24m
$1,143
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Tue 4/14
11:15 am-8:00 am
2 stops18h 45m
Buenos Aires Ministro Pistarini
Thu 4/23
9:00 pm-3:48 pm
2 stops20h 48m
$1,176
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 4/13
4:41 pm-4:00 pm
2 stops21h 19m
Buenos Aires Jorge Newbery
Mon 4/20
5:05 pm-10:34 am
2 stops19h 29m
$1,197
Showing 1-10 of 17 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
No data available for this route at this time. Please check back soon.
Reviews of airlines servicing Buenos Aires
Get insights into the airlines that provide service to Buenos Aires. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Buenos Aires. Reviews last updated March 4, 2026.
Get a feel of what it's like to fly with Delta, LATAM Airlines, and American Airlines from St. Louis to Buenos Aires by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Boarding
8.1
Crew
8.5
Food
7.2
Overall
7.9
Entertainment
7.8
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Crew
8.5
Food
7.2
Overall
7.9
Entertainment
7.8
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Crew
8.5
Food
7.2
Overall
7.9
Entertainment
7.8
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Boarding
8.1
Crew
8.5
Food
7.2
Overall
7.9
Entertainment
7.8
Comfort
7.9
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Related info for your journey
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St. Louis and Buenos Aires flights
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Top airline flying from St. Louis to Buenos Aires
Discover the top airline 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 March 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$1,025 | Average$1,390 | FlexibilityNo cancel fee | On-timeN/A |