$892+ 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 6/4. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
May 29 — Jun 51
Round-trip
1 adult, Economy
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Find cheap flights from St. Louis to Buenos Aires with Cheapflights
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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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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 29, 2026.
Explore the most affordable flight options available from St. Louis to Buenos Aires. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 29, 2026.
This lol.travel deal was found by Cheapflights users on 4/26. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/45:20 pm
STL
- EZE
1 stop14h 25m
LATAM Airlines
Thu 6/188:10 pm
EZE
- STL
1 stop14h 06m
LATAM Airlines
Deal found 4/26![LATAM Airlines logo]()
$892
This LATAM Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 6/101:39 pm
STL
- EZE
2 stops18h 01m
LATAM Airlines
Thu 6/1810:40 pm
EZE
- STL
2 stops21h 27m
LATAM Airlines
Deal found 4/27![LATAM Airlines logo]()
$894
This KAYAK deal was found by Cheapflights users on 4/28. 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.
Wed 8/1911:51 am
STL
- AEP
2 stops18h 39m
LATAM Airlines
Wed 8/269:25 am
AEP
- STL
2 stops27h 16m
LATAM Airlines
Deal found 4/28![LATAM Airlines logo]()
$909
This United Airlines deal was found by Cheapflights users on 4/28. 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.
Wed 8/193:02 pm
STL
- EZE
1 stop14h 58m
United Airlines
Wed 8/269:00 pm
EZE
- STL
1 stop15h 09m
United Airlines
Deal found 4/28![United Airlines logo]()
$909
This LATAM Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Thu 6/182:55 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 4/26![LATAM Airlines logo]()
$911
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:49 am
STL
- EZE
2 stops20h 31m
Delta
Thu 6/188:10 pm
EZE
- STL
1 stop14h 06m
Delta
Deal found 4/29![Delta logo]()
$913
This KAYAK deal was found by Cheapflights users on 4/27. 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.
Mon 6/810:51 am
STL
- AEP
2 stops18h 49m
LATAM Airlines
Fri 6/193:45 pm
AEP
- STL
2 stops19h 23m
LATAM Airlines
Deal found 4/27![LATAM Airlines logo]()
$969
This LATAM Airlines deal was found by Cheapflights users on 4/27. 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 6/87:12 pm
STL
- EZE
1 stop12h 33m
Multiple Airlines
Fri 6/198:10 pm
EZE
- STL
1 stop14h 58m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$969
This LATAM Airlines deal was found by Cheapflights users on 4/28. 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.
Fri 6/121:39 pm
STL
- EZE
2 stops19h 51m
LATAM Airlines
Thu 6/183:55 am
EZE
- STL
2 stops22h 01m
LATAM Airlines
Deal found 4/28![LATAM Airlines logo]()
$1,029
This United Airlines deal was found by Cheapflights users on 4/27. 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 6/16:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Mon 6/299:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,116
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:01 pm
STL
- AEP
2 stops18h 59m
Delta
Thu 6/253:45 pm
AEP
- STL
2 stops20h 01m
Delta
Deal found 4/27![Delta logo]()
$1,118
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:01 pm
STL
- EZE
1 stop12h 44m
Delta
Thu 6/2510:40 pm
EZE
- STL
2 stops15h 54m
Delta
Deal found 4/27![Delta logo]()
$1,118
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 29, 2026.
Discover carefully curated flight deals from St. Louis to Buenos Aires that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated April 29, 2026.
This LATAM Airlines deal was found by Cheapflights users on 4/27. 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 6/113:57 pm
STL
- EZE
1 stop15h 48m
LATAM Airlines
Thu 6/1810:40 pm
EZE
- STL
2 stops21h 27m
LATAM Airlines
Deal found 4/27![LATAM Airlines logo]()
$894
This Delta deal was found by Cheapflights users on 4/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/41:27 pm
STL
- EZE
2 stops17h 53m
Delta
Thu 6/1810:40 pm
EZE
- STL
2 stops21h 27m
Delta
Deal found 4/29![Delta logo]()
$913
This United Airlines deal was found by Cheapflights users on 4/29. 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.
Mon 6/18:35 am
STL
- EZE
1 stop21h 25m
United Airlines
Tue 6/99:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/29![United Airlines logo]()
$1,127
This Mytrip deal was found by Cheapflights users on 4/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/12:15 pm
STL
- EZE
3 stops35h 30m
Multiple Airlines
Tue 6/97:10 am
EZE
- STL
3 stops30h 56m
Multiple Airlines
Deal found 4/25![Multiple Airlines logo]()
$1,183
This LATAM Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 6/101:39 pm
STL
- EZE
2 stops18h 01m
LATAM Airlines
Thu 6/1810:40 pm
EZE
- STL
2 stops21h 27m
LATAM Airlines
Deal found 4/27![LATAM Airlines logo]()
$894
This LATAM Airlines deal was found by Cheapflights users on 4/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 6/410:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Thu 6/182:55 pm
AEP
- STL
2 stops19h 21m
LATAM Airlines
Deal found 4/26![LATAM Airlines logo]()
$911
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:49 am
STL
- AEP
2 stops18h 51m
Delta
Thu 6/253:45 pm
AEP
- STL
2 stops20h 01m
Delta
Deal found 4/27![Delta logo]()
$1,118
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:01 pm
STL
- AEP
2 stops18h 59m
Delta
Thu 6/253:45 pm
AEP
- STL
2 stops20h 01m
Delta
Deal found 4/27![Delta logo]()
$1,118
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 5/2911:10 am
STL
- EZE
1 stop18h 50m
United Airlines
Mon 6/299:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,241
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:01 pm
STL
- EZE
1 stop12h 44m
Delta
Thu 6/2510:40 pm
EZE
- STL
2 stops15h 54m
Delta
Deal found 4/27![Delta logo]()
$1,118
This KAYAK deal was found by Cheapflights users on 4/29. 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.
Mon 6/15:20 pm
STL
- AEP
2 stops19h 30m
LATAM Airlines
Tue 6/93:45 pm
AEP
- STL
2 stops22h 49m
LATAM Airlines
Deal found 4/29![LATAM Airlines logo]()
$1,119
This KAYAK deal was found by Cheapflights users on 4/29. 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.
Mon 6/17:01 pm
STL
- EZE
1 stop12h 44m
LATAM Airlines
Mon 6/83:55 am
EZE
- STL
2 stops22h 01m
LATAM Airlines
Deal found 4/29![LATAM Airlines logo]()
$1,119
This Mytrip deal was found by Cheapflights users on 4/26. 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.
Thu 6/42:15 pm
STL
- AEP
2 stops21h 05m
Multiple Airlines
Thu 6/187:00 am
AEP
- STL
3 stops31h 21m
Multiple Airlines
Deal found 4/26![Multiple Airlines logo]()
$1,603
This LATAM Airlines deal was found by Cheapflights users on 4/27. 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 6/210:49 am
STL
- AEP
2 stops18h 51m
LATAM Airlines
Mon 6/293:45 pm
AEP
- STL
2 stops20h 01m
LATAM Airlines
Deal found 4/27![LATAM Airlines logo]()
$1,127
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 6/210:49 am
STL
- AEP
2 stops18h 51m
Delta
Fri 6/263:45 pm
AEP
- STL
2 stops19h 23m
Delta
Deal found 4/27![Delta logo]()
$1,243
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/17:01 pm
STL
- AEP
2 stops18h 59m
Delta
Fri 6/263:45 pm
AEP
- STL
2 stops19h 23m
Delta
Deal found 4/27![Delta logo]()
$1,252
This KAYAK deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/125:30 pm
STL
- AEP
2 stops20h 30m
LATAM Airlines
Tue 8/185:35 pm
AEP
- STL
2 stops19h 06m
LATAM Airlines
Deal found 4/24![LATAM Airlines logo]()
$1,285
This LATAM Airlines deal was found by Cheapflights users on 4/24. 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.
Fri 5/225:20 pm
STL
- AEP
2 stops20h 40m
LATAM Airlines
Fri 5/295:35 pm
AEP
- STL
2 stops20h 19m
LATAM Airlines
Deal found 4/24![LATAM Airlines logo]()
$1,377
This KAYAK deal was found by Cheapflights users on 4/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/266:57 pm
STL
- AEP
2 stops19h 03m
LATAM Airlines
Sun 5/318:05 pm
AEP
- STL
2 stops18h 15m
LATAM Airlines
Deal found 4/24![LATAM Airlines logo]()
$1,439
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 29, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated April 29, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 5/2711:10 am
STL
- EZE
1 stop18h 50m
United Airlines
Mon 6/299:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,201
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 5/272:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Tue 6/309:00 pm
EZE
- STL
2 stops39h 34m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,244
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Wed 5/272:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Wed 6/249:00 pm
EZE
- STL
2 stops39h 34m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,269
This Kiwi.com deal was found by Cheapflights users on 4/27. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/274:19 pm
STL
- EZE
2 stops33h 57m
Multiple Airlines
Thu 6/2511:25 pm
EZE
- STL
1 stop17h 12m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$1,286
This Delta deal was found by Cheapflights users on 4/27. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/276:57 pm
STL
- AEP
2 stops19h 03m
Delta
Fri 6/263:45 pm
AEP
- STL
2 stops19h 23m
Delta
Deal found 4/27![Delta logo]()
$1,328
This United Airlines deal was found by Cheapflights users on 4/28. 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 5/2811:10 am
STL
- EZE
1 stop18h 50m
United Airlines
Thu 6/49:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 4/28![United Airlines logo]()
$1,212
This LATAM Airlines deal was found by Cheapflights users on 4/28. 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 5/2810:49 am
STL
- EZE
2 stops20h 51m
LATAM Airlines
Thu 6/410:40 pm
EZE
- STL
2 stops15h 40m
LATAM Airlines
Deal found 4/28![LATAM Airlines logo]()
$1,273
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 5/296:00 am
STL
- EZE
2 stops24h 00m
United Airlines
Mon 6/299:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,241
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Fri 5/292:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Tue 6/309:00 pm
EZE
- STL
2 stops41h 11m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,284
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sun 5/316:24 pm
STL
- EZE
1 stop35h 36m
United Airlines
Tue 6/309:00 pm
EZE
- STL
2 stops43h 23m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,254
This Kiwi.com deal was found by Cheapflights users on 4/27. 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.
Sun 5/314:19 pm
STL
- EZE
2 stops32h 11m
Multiple Airlines
Thu 6/2511:25 pm
EZE
- STL
1 stop17h 12m
Multiple Airlines
Deal found 4/27![Multiple Airlines logo]()
$1,268
This United Airlines deal was found by Cheapflights users on 4/27. 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.
Sun 5/316:24 pm
STL
- EZE
1 stop35h 36m
United Airlines
Wed 6/249:00 pm
EZE
- STL
2 stops39h 34m
United Airlines
Deal found 4/27![United Airlines logo]()
$1,280
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 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $892 (lol.travel) |
Popular in | May |
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 29, 2026.
Use the filters below to find and compare flights from St. Louis to Buenos Aires that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 6/11
3:57 pm-9:45 am
1 stop15h 48m
Buenos Aires Ministro Pistarini
Thu 6/18
10:40 pm-6:07 pm
2 stops21h 27m
$894
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 6/10
1:39 pm-9:40 am
2 stops18h 01m
Buenos Aires Ministro Pistarini
Thu 6/18
10:40 pm-6:07 pm
2 stops21h 27m
$894
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 6/4
10:49 am-7:40 am
2 stops18h 51m
Buenos Aires Jorge Newbery
Thu 6/18
2:55 pm-8:16 am
2 stops19h 21m
$911
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 6/4
1:27 pm-9:20 am
2 stops17h 53m
Buenos Aires Ministro Pistarini
Thu 6/18
10:40 pm-6:07 pm
2 stops21h 27m
$913
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Tue 6/2
10:49 am-7:40 am
2 stops18h 51m
Buenos Aires Jorge Newbery
Thu 6/25
3:45 pm-9:46 am
2 stops20h 01m
$1,118
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 6/1
7:01 pm-4:00 pm
2 stops18h 59m
Buenos Aires Jorge Newbery
Thu 6/25
3:45 pm-9:46 am
2 stops20h 01m
$1,118
Quickest round-trip
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 6/1
7:01 pm-9:45 am
1 stop12h 44m
Buenos Aires Ministro Pistarini
Thu 6/25
10:40 pm-12:34 pm
2 stops15h 54m
$1,118
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Mon 6/1
5:20 pm-2:50 pm
2 stops19h 30m
Buenos Aires Jorge Newbery
Tue 6/9
3:45 pm-12:34 pm
2 stops22h 49m
$1,119
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 6/1
7:01 pm-9:45 am
1 stop12h 44m
Buenos Aires Ministro Pistarini
Mon 6/8
3:55 am-11:56 pm
2 stops22h 01m
$1,119
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 6/1
8:35 am-8:00 am
1 stop21h 25m
Buenos Aires Ministro Pistarini
Tue 6/9
9:00 pm-10:07 am
1 stop15h 07m
$1,127
Showing 1-10 of 19 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 April 29, 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.
Crew
8.5
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Overall
7.9
Food
7.2
Reviews
1 / 20
6.0
GoodJim,Nov 2025
AVL - ATL
Crew
8.5
Boarding
8.1
Comfort
7.9
Entertainment
7.8
Overall
7.9
Food
7.2
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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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 29, 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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St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on April 29, 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 29, 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 29, 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 |