$581+ 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 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Jul 29 — Aug 51
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
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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 June 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 June 29, 2026.
This oojo deal was found by Cheapflights users on 6/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
STL
- EZE
2 stops25h 40m
LATAM Airlines
Wed 8/261:10 pm
EZE
- STL
2 stops22h 44m
LATAM Airlines
Deal found 6/24![LATAM Airlines logo]()
$1,146
This Delta deal was found by Cheapflights users on 6/24. 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.
Thu 8/139:15 am
STL
- AEP
2 stops20h 25m
Delta
Wed 8/268:05 pm
AEP
- STL
2 stops20h 28m
Delta
Deal found 6/24![Delta logo]()
$1,148
This Delta deal was found by Cheapflights users on 6/24. 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.
Thu 8/1311:00 am
STL
- EZE
1 stop20h 45m
Delta
Wed 8/268:10 pm
EZE
- STL
1 stop17h 36m
Delta
Deal found 6/24![Delta logo]()
$1,148
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Mon 8/106:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Mon 8/179:00 pm
EZE
- STL
1 stop19h 15m
United Airlines
Deal found 6/26![United Airlines logo]()
$1,163
This LATAM Airlines deal was found by Cheapflights users on 6/27. 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 10/287:05 pm
STL
- AEP
2 stops18h 55m
LATAM Airlines
Sun 11/18:40 am
AEP
- STL
2 stops35h 26m
LATAM Airlines
Deal found 6/27![LATAM Airlines logo]()
$1,178
This United Airlines deal was found by Cheapflights users on 6/28. 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 7/82:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Sun 7/129:00 pm
EZE
- STL
1 stop22h 42m
United Airlines
Deal found 6/28![United Airlines logo]()
$1,208
This oojo deal was found by Cheapflights users on 6/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/226:00 am
STL
- EZE
2 stops25h 40m
LATAM Airlines
Sat 8/297:35 am
EZE
- STL
2 stops26h 34m
LATAM Airlines
Deal found 6/29![LATAM Airlines logo]()
$1,222
This Delta deal was found by Cheapflights users on 6/29. 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.
Sat 8/2210:31 am
STL
- EZE
1 stop21h 14m
Delta
Sat 8/293:35 pm
EZE
- STL
2 stops18h 34m
Delta
Deal found 6/29![Delta logo]()
$1,228
This American Airlines deal was found by Cheapflights users on 6/29. 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.
Sat 8/2211:35 am
STL
- EZE
1 stop17h 40m
American Airlines
Sat 8/2910:30 pm
EZE
- STL
1 stop14h 15m
American Airlines
Deal found 6/29![American Airlines logo]()
$1,238
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/245:59 pm
STL
- EZE
2 stops36h 01m
United Airlines
Fri 7/319:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 6/25![United Airlines logo]()
$1,242
This Ovago deal was found by Cheapflights users on 6/25. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/243:58 pm
STL
- EZE
1 stop15h 47m
LATAM Airlines
Fri 7/318:10 pm
EZE
- STL
1 stop18h 20m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,246
This LATAM Airlines deal was found by Cheapflights users on 6/24. 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.
Wed 7/810:51 am
STL
- AEP
2 stops27h 09m
LATAM Airlines
Sun 7/128:05 pm
AEP
- STL
2 stops18h 12m
LATAM Airlines
Deal found 6/24![LATAM Airlines logo]()
$1,416
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 June 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 June 29, 2026.
This oojo deal was found by Cheapflights users on 6/24. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/136:00 am
STL
- EZE
2 stops25h 40m
LATAM Airlines
Wed 8/261:10 pm
EZE
- STL
2 stops22h 44m
LATAM Airlines
Deal found 6/24![LATAM Airlines logo]()
$1,146
This Delta deal was found by Cheapflights users on 6/24. 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.
Thu 8/139:15 am
STL
- AEP
2 stops20h 25m
Delta
Wed 8/268:05 pm
AEP
- STL
2 stops20h 28m
Delta
Deal found 6/24![Delta logo]()
$1,148
This United Airlines deal was found by Cheapflights users on 6/26. 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.
Mon 8/106:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Mon 8/179:00 pm
EZE
- STL
1 stop19h 15m
United Airlines
Deal found 6/26![United Airlines logo]()
$1,163
This Mytrip deal was found by Cheapflights users on 6/24. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/1312:10 pm
STL
- AEP
3 stops31h 20m
Multiple Airlines
Wed 8/267:00 am
AEP
- STL
3 stops33h 02m
Multiple Airlines
Deal found 6/24![Multiple Airlines logo]()
$1,547
This Expedia deal was found by Cheapflights users on 6/25. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/2411:00 am
STL
- AEP
2 stops48h 00m
GOL
Thu 7/303:40 am
AEP
- STL
2 stops21h 14m
GOL
Deal found 6/25![GOL logo]()
$1,869
This Delta deal was found by Cheapflights users on 6/24. 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.
Thu 8/1311:00 am
STL
- EZE
1 stop20h 45m
Delta
Wed 8/268:10 pm
EZE
- STL
1 stop17h 36m
Delta
Deal found 6/24![Delta logo]()
$1,148
This LATAM Airlines deal was found by Cheapflights users on 6/28. 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.
Wed 10/284:13 pm
STL
- AEP
2 stops24h 27m
LATAM Airlines
Sun 11/18:40 am
AEP
- STL
2 stops35h 26m
LATAM Airlines
Deal found 6/28![LATAM Airlines logo]()
$1,178
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/245:59 pm
STL
- EZE
2 stops36h 01m
United Airlines
Fri 7/319:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 6/25![United Airlines logo]()
$1,242
This Delta deal was found by Cheapflights users on 6/29. 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.
Sat 8/2210:31 am
STL
- EZE
1 stop21h 14m
Delta
Sat 8/293:35 pm
EZE
- STL
2 stops18h 34m
Delta
Deal found 6/29![Delta logo]()
$1,228
This FlightHub deal was found by Cheapflights users on 6/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/91:40 pm
STL
- EZE
2 stops35h 05m
LATAM Airlines
Sat 9/127:21 pm
EZE
- STL
2 stops39h 34m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,298
This United Airlines deal was found by Cheapflights users on 6/29. 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 7/276:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Mon 8/39:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 6/29![United Airlines logo]()
$1,373
This KAYAK deal was found by Cheapflights users on 6/28. 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.
Mon 12/216:59 pm
STL
- EZE
2 stops35h 41m
LATAM Airlines
Sun 1/171:10 pm
EZE
- STL
2 stops24h 38m
LATAM Airlines
Deal found 6/28![LATAM Airlines logo]()
$1,377
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/93:13 pm
STL
- EZE
1 stop14h 47m
United Airlines
Sat 9/129:00 pm
EZE
- STL
1 stop15h 10m
United Airlines
Deal found 6/25![United Airlines logo]()
$1,404
This FlightHub deal was found by Cheapflights users on 6/25. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/95:46 pm
STL
- AEP
2 stops20h 14m
LATAM Airlines
Sat 9/123:45 pm
AEP
- STL
2 stops20h 56m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,556
This LATAM Airlines deal was found by Cheapflights users on 6/25. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:58 pm
STL
- AEP
2 stops19h 02m
LATAM Airlines
Tue 7/218:05 pm
AEP
- STL
2 stops18h 12m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,660
This Ovago deal was found by Cheapflights users on 6/29. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/214:40 pm
STL
- AEP
2 stops24h 00m
LATAM Airlines
Sun 1/178:05 pm
AEP
- STL
2 stops24h 01m
LATAM Airlines
Deal found 6/29![LATAM Airlines logo]()
$1,747
This Orbitz deal was found by Cheapflights users on 6/26. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/196:00 am
STL
- AEP
2 stops23h 40m
LATAM Airlines
Mon 11/211:30 am
AEP
- STL
2 stops26h 18m
LATAM Airlines
Deal found 6/26![LATAM Airlines logo]()
$2,459
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated June 29, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated June 29, 2026 and is based on user searches.
This Kiwi.com deal was found by Cheapflights users on 6/25. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/296:30 am
STL
- EZE
1 stop18h 05m
Multiple Airlines
Wed 7/14:45 am
EZE
- STL
2 stops35h 52m
Multiple Airlines
Deal found 6/25![Multiple Airlines logo]()
$1,533
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/292:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Wed 7/19:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 6/25![United Airlines logo]()
$1,660
This Justfly.com deal was found by Cheapflights users on 6/25. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 6/293:57 pm
STL
- AEP
2 stops25h 43m
LATAM Airlines
Wed 7/15:35 pm
AEP
- STL
2 stops20h 59m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,816
This Kiwi.com deal was found by Cheapflights users on 6/27. 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 7/16:30 am
STL
- EZE
1 stop18h 05m
Multiple Airlines
Fri 7/34:45 am
EZE
- STL
2 stops35h 52m
Multiple Airlines
Deal found 6/27![Multiple Airlines logo]()
$1,460
This oojo deal was found by Cheapflights users on 6/27. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 7/110:51 am
STL
- EZE
2 stops20h 49m
LATAM Airlines
Fri 7/31:10 pm
EZE
- STL
2 stops25h 24m
LATAM Airlines
Deal found 6/27![LATAM Airlines logo]()
$1,662
This KAYAK deal was found by Cheapflights users on 6/27. 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.
Wed 7/13:57 pm
STL
- AEP
2 stops23h 03m
LATAM Airlines
Fri 7/38:05 pm
AEP
- STL
2 stops18h 29m
LATAM Airlines
Deal found 6/27![LATAM Airlines logo]()
$1,690
This United Airlines deal was found by Cheapflights users on 6/28. 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 7/82:57 pm
STL
- EZE
1 stop15h 03m
United Airlines
Sun 7/129:00 pm
EZE
- STL
1 stop22h 42m
United Airlines
Deal found 6/28![United Airlines logo]()
$1,208
This LATAM Airlines deal was found by Cheapflights users on 6/24. 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.
Wed 7/810:51 am
STL
- AEP
2 stops27h 09m
LATAM Airlines
Sun 7/128:05 pm
AEP
- STL
2 stops18h 12m
LATAM Airlines
Deal found 6/24![LATAM Airlines logo]()
$1,416
This LATAM Airlines deal was found by Cheapflights users on 6/25. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 7/206:58 pm
STL
- AEP
2 stops19h 02m
LATAM Airlines
Tue 7/218:05 pm
AEP
- STL
2 stops18h 12m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,660
This United Airlines deal was found by Cheapflights users on 6/25. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/245:59 pm
STL
- EZE
2 stops36h 01m
United Airlines
Fri 7/319:00 pm
EZE
- STL
2 stops26h 26m
United Airlines
Deal found 6/25![United Airlines logo]()
$1,242
This Ovago deal was found by Cheapflights users on 6/25. 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 Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/243:58 pm
STL
- EZE
1 stop15h 47m
LATAM Airlines
Fri 7/318:10 pm
EZE
- STL
1 stop18h 20m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$1,246
This United Airlines deal was found by Cheapflights users on 6/29. 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 7/276:14 am
STL
- EZE
1 stop23h 46m
United Airlines
Mon 8/39:00 pm
EZE
- STL
1 stop15h 07m
United Airlines
Deal found 6/29![United Airlines logo]()
$1,373
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 June 29, 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 June 29, 2026.
This KAYAK deal was found by Cheapflights users on 6/28. 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 12/27:04 pm
STL
- EZE
2 stops29h 53m
Copa Airlines
Deal found 6/28![Copa Airlines logo]()
$581
This Justfly.com deal was found by Cheapflights users on 6/25. 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 Justfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:04 pm
STL
- AEP
2 stops31h 36m
Avianca
Deal found 6/25![Avianca logo]()
$751
This Avianca deal was found by Cheapflights users on 6/25. 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 Avianca is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/27:04 pm
STL
- EZE
2 stops17h 46m
Avianca
Deal found 6/25![Avianca logo]()
$759
This LATAM Airlines deal was found by Cheapflights users on 6/25. 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 LATAM Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/29:00 am
STL
- EZE
1 stop21h 40m
LATAM Airlines
Deal found 6/25![LATAM Airlines logo]()
$784
This Air Canada deal was found by Cheapflights users on 6/28. 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.
Wed 12/27:04 pm
STL
- EZE
3 stops41h 01m
Air Canada
Deal found 6/28![Air Canada logo]()
$1,454
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 June 29, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,146 (oojo) |
One-way from | $581 (KAYAK) |
Popular in | May |
Cheapest in | October |
Average price | $1,473 |
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 June 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 8/13
6:00 am-9:40 am
2 stops25h 40m
Buenos Aires Ministro Pistarini
Wed 8/26
1:10 pm-9:54 am
2 stops22h 44m
$1,146
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Thu 8/13
9:15 am-7:40 am
2 stops20h 25m
Buenos Aires Jorge Newbery
Wed 8/26
8:05 pm-2:33 pm
2 stops20h 28m
$1,148
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Thu 8/13
11:00 am-9:45 am
1 stop20h 45m
Buenos Aires Ministro Pistarini
Wed 8/26
8:10 pm-11:46 am
1 stop17h 36m
$1,148
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 8/10
6:14 am-8:00 am
1 stop23h 46m
Buenos Aires Ministro Pistarini
Mon 8/17
9:00 pm-2:15 pm
1 stop19h 15m
$1,163
St. LouisBuenos Aires
STL - AEP
STLAEP
Lambert-St Louis
Wed 10/28
4:13 pm-6:40 pm
2 stops24h 27m
Buenos Aires Jorge Newbery
Sun 11/1
8:40 am-5:06 pm
2 stops35h 26m
$1,178
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Sat 8/22
10:31 am-9:45 am
1 stop21h 14m
Buenos Aires Ministro Pistarini
Sat 8/29
3:35 pm-8:09 am
2 stops18h 34m
$1,228
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Fri 7/24
5:59 pm-8:00 am
2 stops36h 01m
Buenos Aires Ministro Pistarini
Fri 7/31
9:00 pm-9:26 pm
2 stops26h 26m
$1,242
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Wed 9/9
1:40 pm-2:45 am
2 stops35h 05m
Buenos Aires Ministro Pistarini
Sat 9/12
7:21 pm-8:55 am
2 stops39h 34m
$1,298
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 7/27
6:14 am-8:00 am
1 stop23h 46m
Buenos Aires Ministro Pistarini
Mon 8/3
9:00 pm-10:07 am
1 stop15h 07m
$1,373
St. LouisBuenos Aires
STL - EZE
STLEZE
Lambert-St Louis
Mon 12/21
6:59 pm-9:40 am
2 stops35h 41m
Buenos Aires Ministro Pistarini
Sun 1/17
1:10 pm-10:48 am
2 stops24h 38m
$1,377
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-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 June 29, 2026.
Get a feel of what it's like to fly with Delta and LATAM 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
Food
7.2
Entertainment
7.8
Boarding
8.1
Overall
7.8
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Food
7.2
Entertainment
7.8
Boarding
8.1
Overall
7.8
Comfort
7.8
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Food
7.2
Entertainment
7.8
Boarding
8.1
Overall
7.8
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.
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Alternative routes
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Complete your trip
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Alternative routes for St. Louis to Buenos Aires
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Other flights to Buenos Aires
Explore flights to Buenos Aires departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on June 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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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 June 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 June 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 June 29, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,109 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,396 | FlexibilityNo cancel fee | On-timeN/A |