$420+ 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 10/29. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Sep 27 — Oct 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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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 August 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 August 28, 2026.
This Trip.com deal was found by Cheapflights users on 8/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:29 pm -
2 stops17h 11m
Sun 9/201:10 pm -
2 stops26h 00m
Deal found 8/24![Multiple Airlines logo]()
$1,035
This Mytrip deal was found by Cheapflights users on 8/24. 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.
Mon 9/212:40 pm -
3 stops34h 20m
Mon 9/286:00 am -
3 stops34h 00m
Deal found 8/24![Multiple Airlines logo]()
$1,091
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 10/146:30 am -
1 stop18h 05m
Thu 10/221:10 pm -
2 stops30h 30m
Deal found 8/27![Multiple Airlines logo]()
$1,143
This LATAM Airlines deal was found by Cheapflights users on 8/28. 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 11/26:00 am -
2 stops22h 40m
Tue 11/103:50 pm -
2 stops22h 25m
Deal found 8/28![LATAM Airlines logo]()
$1,148
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 10/146:30 am -
1 stop18h 05m
Tue 10/201:10 pm -
2 stops30h 30m
Deal found 8/27![Multiple Airlines logo]()
$1,158
This United Airlines deal was found by Cheapflights users on 8/27. 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 10/145:36 pm -
2 stops36h 24m
Wed 10/219:00 pm -
1 stop19h 10m
Deal found 8/27![United Airlines logo]()
$1,167
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Sun 9/278:05 pm -
2 stops16h 50m
Deal found 8/24![Delta logo]()
$1,169
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/236:45 pm -
1 stop13h 00m
Thu 10/18:10 pm -
1 stop26h 11m
Deal found 8/24![Delta logo]()
$1,169
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Mon 10/58:05 pm -
2 stops19h 15m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 10/1310:14 am -
2 stops17h 56m
Tue 10/207:35 am -
2 stops18h 19m
Deal found 8/27![Delta logo]()
$1,178
This Orbitz deal was found by Cheapflights users on 8/28. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/25:38 pm -
2 stops30h 22m
Mon 11/94:00 am -
2 stops31h 55m
Deal found 8/28![LATAM Airlines logo]()
$1,179
This LATAM Airlines deal was found by Cheapflights users on 8/25. 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.
Tue 9/1512:00 pm -
2 stops19h 40m
Mon 9/213:55 am -
2 stops21h 47m
Deal found 8/25![LATAM Airlines logo]()
$1,182
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 August 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 August 28, 2026.
This LATAM Airlines deal was found by Cheapflights users on 8/28. 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 11/26:00 am -
2 stops22h 40m
Tue 11/103:50 pm -
2 stops22h 25m
Deal found 8/28![LATAM Airlines logo]()
$1,148
This Delta deal was found by Cheapflights users on 8/24. 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 9/242:30 pm -
1 stop17h 15m
Thu 10/18:10 pm -
1 stop16h 45m
Deal found 8/24![Delta logo]()
$1,169
This United Airlines deal was found by Cheapflights users on 8/25. 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 10/93:12 pm -
1 stop14h 48m
Fri 10/169:00 pm -
1 stop19h 10m
Deal found 8/25![United Airlines logo]()
$1,233
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2310:05 am -
2 stops19h 35m
Thu 10/18:05 pm -
2 stops20h 03m
Deal found 8/24![Delta logo]()
$1,178
This LATAM Airlines deal was found by Cheapflights users on 8/25. 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 9/2312:00 pm -
2 stops18h 30m
Sun 10/48:05 pm -
2 stops16h 50m
Deal found 8/25![LATAM Airlines logo]()
$1,178
This United Airlines deal was found by Cheapflights users on 8/26. 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.
Sat 10/35:36 pm -
2 stops36h 24m
Sun 10/119:00 pm -
1 stop27h 30m
Deal found 8/26![United Airlines logo]()
$1,252
This Delta deal was found by Cheapflights users on 8/27. 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 10/135:35 pm -
2 stops20h 25m
Wed 10/218:05 pm -
2 stops19h 15m
Deal found 8/27![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 10/1212:00 pm -
2 stops17h 40m
Wed 10/218:05 pm -
2 stops22h 23m
Deal found 8/27![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Mon 10/58:05 pm -
2 stops19h 15m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 10/1410:14 am -
2 stops19h 26m
Wed 10/218:05 pm -
2 stops19h 15m
Deal found 8/27![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 10/1310:14 am -
2 stops19h 26m
Tue 10/203:45 pm -
2 stops19h 24m
Deal found 8/27![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/236:00 am -
2 stops23h 40m
Sun 10/48:05 pm -
2 stops18h 50m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2310:05 am -
2 stops18h 05m
Mon 10/57:35 am -
2 stops18h 07m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 10/137:20 pm -
1 stop12h 25m
Wed 10/214:45 pm -
2 stops22h 35m
Deal found 8/27![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/27. 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 1/69:00 am -
2 stops19h 40m
Sun 1/245:35 pm -
2 stops20h 13m
Deal found 8/27![Delta logo]()
$1,188
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Fri 10/28:05 pm -
2 stops18h 27m
Deal found 8/24![Delta logo]()
$1,199
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Sat 10/38:05 pm -
2 stops16h 50m
Deal found 8/24![Delta logo]()
$1,199
This Delta deal was found by Cheapflights users on 8/24. 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 9/246:54 pm -
1 stop12h 51m
Fri 10/28:10 pm -
1 stop15h 24m
Deal found 8/24![Delta logo]()
$1,199
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops16h 10m
Sun 10/47:35 am -
2 stops18h 07m
Deal found 8/24![Delta logo]()
$1,208
This Delta deal was found by Cheapflights users on 8/24. 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 9/242:30 pm -
1 stop17h 15m
Sat 10/33:35 pm -
2 stops19h 25m
Deal found 8/24![Delta logo]()
$1,208
This Delta deal was found by Cheapflights users on 8/24. 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.
Mon 9/1412:00 pm -
2 stops19h 40m
Sun 9/208:10 pm -
1 stop21h 44m
Deal found 8/24![Delta logo]()
$1,212
This Delta deal was found by Cheapflights users on 8/27. 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.
Sun 10/1112:00 pm -
1 stop19h 45m
Fri 10/238:10 pm -
1 stop16h 41m
Deal found 8/27![Delta logo]()
$1,238
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated August 28, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated August 28, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/24. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/611:35 am -
1 stop16h 25m
Sun 9/1310:15 pm -
1 stop27h 44m
Deal found 8/24![American Airlines logo]()
$1,190
This Trip.com deal was found by Cheapflights users on 8/24. 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 Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/142:29 pm -
2 stops17h 11m
Sun 9/201:10 pm -
2 stops26h 00m
Deal found 8/24![Multiple Airlines logo]()
$1,035
This LATAM Airlines deal was found by Cheapflights users on 8/25. 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.
Tue 9/1512:00 pm -
2 stops19h 40m
Mon 9/213:55 am -
2 stops21h 47m
Deal found 8/25![LATAM Airlines logo]()
$1,182
This Mytrip deal was found by Cheapflights users on 8/24. 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.
Mon 9/212:40 pm -
3 stops34h 20m
Mon 9/286:00 am -
3 stops34h 00m
Deal found 8/24![Multiple Airlines logo]()
$1,091
This Delta deal was found by Cheapflights users on 8/24. 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 9/2212:00 pm -
2 stops17h 40m
Sat 10/38:05 pm -
2 stops16h 50m
Deal found 8/24![Delta logo]()
$1,208
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Sun 9/278:05 pm -
2 stops16h 50m
Deal found 8/24![Delta logo]()
$1,169
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/236:45 pm -
1 stop13h 00m
Thu 10/18:10 pm -
1 stop26h 11m
Deal found 8/24![Delta logo]()
$1,169
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Mon 10/58:05 pm -
2 stops19h 15m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2310:05 am -
2 stops18h 05m
Mon 10/57:35 am -
2 stops18h 07m
Deal found 8/24![Delta logo]()
$1,178
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops17h 40m
Fri 10/28:05 pm -
2 stops18h 27m
Deal found 8/24![Delta logo]()
$1,199
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/2312:00 pm -
2 stops16h 10m
Fri 10/28:10 pm -
1 stop15h 24m
Deal found 8/24![Delta logo]()
$1,199
This Delta deal was found by Cheapflights users on 8/24. 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.
Wed 9/234:59 pm -
1 stop14h 46m
Sat 10/37:35 am -
2 stops18h 07m
Deal found 8/24![Delta logo]()
$1,208
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 August 28, 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 August 28, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:26 pm -
3 stops50h 14m
Deal found 8/26![Multiple Airlines logo]()
$420
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 12/66:05 pm -
3 stops36h 45m
Deal found 8/27![Multiple Airlines logo]()
$482
This KAYAK deal was found by Cheapflights users on 8/27. 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.
Sun 12/610:38 am -
2 stops23h 22m
Deal found 8/27![GOL logo]()
$492
This Kiwi.com deal was found by Cheapflights users on 8/26. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/294:26 pm -
3 stops48h 09m
Deal found 8/26![Multiple Airlines logo]()
$510
This Kiwi.com deal was found by Cheapflights users on 8/27. 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 12/66:05 pm -
3 stops44h 15m
Deal found 8/27![Multiple Airlines logo]()
$511
This Kiwi.com deal was found by Cheapflights users on 8/27. 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.
Thu 10/155:53 pm -
3 stops54h 37m
Deal found 8/27![Multiple Airlines logo]()
$533
This Kiwi.com deal was found by Cheapflights users on 8/27. 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.
Thu 10/154:30 pm -
3 stops40h 50m
Deal found 8/27![Multiple Airlines logo]()
$543
This KAYAK deal was found by Cheapflights users on 8/27. 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 12/76:33 am -
2 stops39h 19m
Deal found 8/27![Copa Airlines logo]()
$593
This BusinessClass deal was found by Cheapflights users on 8/26. 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 BusinessClass is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:33 am -
2 stops36h 51m
Deal found 8/26![Copa Airlines logo]()
$596
This Air Canada deal was found by Cheapflights users on 8/27. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/24:05 pm -
2 stops22h 35m
Deal found 8/27![Multiple Airlines logo]()
$724
This Expedia deal was found by Cheapflights users on 8/25. 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.
Wed 12/26:00 am -
1 stop22h 35m
Deal found 8/25![LATAM Airlines logo]()
$771
This LATAM Airlines deal was found by Cheapflights users on 8/27. 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 12/72:33 pm -
2 stops16h 57m
Deal found 8/27![LATAM Airlines logo]()
$784
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 August 28, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,035 (Trip.com) |
One-way from | $420 (Kiwi.com) |
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 7,457,451 searches. Data last updated August 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
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Mon 11/2
6:00 am-7:40 am
2 stops22h 40m
Buenos Aires Jorge Newbery
Tue 11/10
3:50 pm-11:15 am
2 stops22h 25m
$1,148
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Thu 9/24
2:30 pm-9:45 am
1 stop17h 15m
Buenos Aires Ministro Pistarini
Thu 10/1
8:10 pm-10:55 am
1 stop16h 45m
$1,169
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 9/23
10:05 am-7:40 am
2 stops19h 35m
Buenos Aires Jorge Newbery
Thu 10/1
8:05 pm-2:08 pm
2 stops20h 03m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 9/23
12:00 pm-8:30 am
2 stops18h 30m
Buenos Aires Jorge Newbery
Sun 10/4
8:05 pm-10:55 am
2 stops16h 50m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Tue 10/13
5:35 pm-4:00 pm
2 stops20h 25m
Buenos Aires Jorge Newbery
Wed 10/21
8:05 pm-1:20 pm
2 stops19h 15m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Mon 10/12
12:00 pm-7:40 am
2 stops17h 40m
Buenos Aires Jorge Newbery
Wed 10/21
8:05 pm-4:28 pm
2 stops22h 23m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 9/23
12:00 pm-7:40 am
2 stops17h 40m
Buenos Aires Jorge Newbery
Mon 10/5
8:05 pm-1:20 pm
2 stops19h 15m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 10/14
10:14 am-7:40 am
2 stops19h 26m
Buenos Aires Jorge Newbery
Wed 10/21
8:05 pm-1:20 pm
2 stops19h 15m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Tue 10/13
10:14 am-7:40 am
2 stops19h 26m
Buenos Aires Jorge Newbery
Tue 10/20
3:45 pm-9:09 am
2 stops19h 24m
$1,178
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 9/23
6:00 am-7:40 am
2 stops23h 40m
Buenos Aires Jorge Newbery
Sun 10/4
8:05 pm-12:55 pm
2 stops18h 50m
$1,178
Showing 1-10 of 33 resultsSorted by cheapest first
Compare providers for flights from St. Louis to Buenos Aires
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from St. Louis to Buenos Aires in August.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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
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 August 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.
Food
7.2
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Food
7.2
Entertainment
7.8
Comfort
7.8
Overall
7.8
Boarding
8.1
Crew
8.5
Reviews
1 / 20
8.0
ExcellentJorge,Aug 2026
TPA - ATL
Related info for your journey
Find useful and relevant information for your journey from St. Louis to Buenos Aires. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes
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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 August 28, 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 August 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 August 28, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Top 3 airlines flying from St. Louis to Buenos Aires
Discover the top 3 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 7,457,451 searches. Data last updated August 28, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,173 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,025 | Average$1,414 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$1,147 | Average$1,327 | FlexibilityNo cancel fee | On-time71% |