$716+ 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 1/9. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Sep 9 — Sep 161
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 10, 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 10, 2026.
This Delta deal was found by Cheapflights users on 8/10. 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 12/210:00 am -
2 stops18h 40m
Thu 12/175:35 pm -
2 stops18h 18m
Deal found 8/10![Delta logo]()
$1,148
This Delta deal was found by Cheapflights users on 8/9. 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 12/210:00 am -
2 stops17h 20m
Thu 12/175:00 pm -
2 stops21h 15m
Deal found 8/9![Delta logo]()
$1,148
This United Airlines deal was found by Cheapflights users on 8/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/226:50 pm -
2 stops33h 30m
Tue 12/2910:05 pm -
1 stop27h 14m
Deal found 8/9![United Airlines logo]()
$1,220
This oojo deal was found by Cheapflights users on 8/10. 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 9/242:30 pm -
2 stops17h 10m
Wed 9/303:55 am -
2 stops31h 05m
Deal found 8/10![LATAM Airlines logo]()
$1,225
This KAYAK deal was found by Cheapflights users on 8/5. 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 8/1811:00 am -
2 stops25h 50m
Tue 9/228:05 pm -
2 stops16h 50m
Deal found 8/5![LATAM Airlines logo]()
$1,228
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/1711:15 am -
1 stop18h 45m
Mon 9/219:00 pm -
1 stop23h 31m
Deal found 8/5![United Airlines logo]()
$1,228
This American Airlines deal was found by Cheapflights users on 8/5. 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.
Wed 8/1912:45 pm -
2 stops18h 00m
Sun 9/2010:15 pm -
2 stops16h 48m
Deal found 8/5![American Airlines logo]()
$1,232
This Delta deal was found by Cheapflights users on 8/5. 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 8/1712:52 pm -
2 stops18h 48m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,236
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/166:54 pm -
2 stops35h 06m
Tue 9/229:00 pm -
2 stops20h 38m
Deal found 8/5![United Airlines logo]()
$1,250
This FlightHub deal was found by Cheapflights users on 8/7. 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.
Thu 12/102:31 pm -
2 stops16h 19m
Sat 12/197:20 am -
2 stops37h 41m
Deal found 8/7![LATAM Airlines logo]()
$1,253
This American Airlines deal was found by Cheapflights users on 8/8. 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.
Thu 8/1310:22 am -
2 stops20h 23m
Thu 8/2010:30 pm -
2 stops20h 31m
Deal found 8/8![American Airlines logo]()
$1,254
This LATAM Airlines deal was found by Cheapflights users on 8/6. 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.
Sun 9/204:59 pm -
2 stops21h 01m
Sun 9/278:05 pm -
2 stops16h 50m
Deal found 8/6![LATAM Airlines logo]()
$1,258
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 10, 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 10, 2026.
This Delta deal was found by Cheapflights users on 8/8. 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 12/210:00 am -
2 stops18h 40m
Thu 12/175:35 pm -
2 stops20h 40m
Deal found 8/8![Delta logo]()
$1,148
This Expedia deal was found by Cheapflights users on 8/7. 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.
Sat 1/166:59 pm -
2 stops35h 51m
Thu 1/287:20 am -
2 stops19h 19m
Deal found 8/7![LATAM Airlines logo]()
$1,187
This United Airlines deal was found by Cheapflights users on 8/6. 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 9/206:53 pm -
2 stops35h 07m
Sun 9/279:00 pm -
1 stop19h 10m
Deal found 8/6![United Airlines logo]()
$1,232
This LATAM Airlines deal was found by Cheapflights users on 8/7. 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 9/176:54 pm -
2 stops21h 36m
Thu 9/243:45 pm -
2 stops19h 15m
Deal found 8/7![LATAM Airlines logo]()
$1,228
This Delta deal was found by Cheapflights users on 8/10. 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 9/2412:00 pm -
1 stop19h 45m
Thu 10/18:10 pm -
1 stop21h 44m
Deal found 8/10![Delta logo]()
$1,228
This United Airlines deal was found by Cheapflights users on 8/9. 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 12/216:50 pm -
2 stops33h 30m
Tue 12/2910:05 pm -
2 stops26h 13m
Deal found 8/9![United Airlines logo]()
$1,301
This KAYAK deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 8/2011:00 am -
2 stops18h 40m
Thu 9/176:20 pm -
2 stops18h 35m
Deal found 8/5![LATAM Airlines logo]()
$1,228
This Delta deal was found by Cheapflights users on 8/7. 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 9/176:54 pm -
1 stop12h 51m
Thu 9/244:45 pm -
2 stops20h 10m
Deal found 8/7![Delta logo]()
$1,228
This Delta deal was found by Cheapflights users on 8/5. 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 8/209:15 am -
2 stops20h 25m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,236
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2112:52 pm -
1 stop18h 53m
Thu 9/178:10 pm -
1 stop14h 50m
Deal found 8/5![Delta logo]()
$1,258
This Delta deal was found by Cheapflights users on 8/5. 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 8/225:33 pm -
1 stop14h 12m
Mon 9/218:10 pm -
1 stop19h 13m
Deal found 8/5![Delta logo]()
$1,258
This Delta deal was found by Cheapflights users on 8/5. 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 8/225:33 pm -
2 stops20h 27m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,266
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2111:00 am -
2 stops18h 40m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,266
This Delta deal was found by Cheapflights users on 8/5. 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 8/205:23 pm -
1 stop14h 22m
Sun 9/208:10 pm -
1 stop29h 32m
Deal found 8/5![Delta logo]()
$1,267
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/2112:52 pm -
1 stop18h 53m
Sat 9/198:10 pm -
1 stop14h 50m
Deal found 8/5![Delta logo]()
$1,288
This Delta deal was found by Cheapflights users on 8/6. 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 9/2012:00 pm -
1 stop19h 45m
Sun 9/278:10 pm -
1 stop21h 44m
Deal found 8/6![Delta logo]()
$1,288
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/213:39 pm -
1 stop16h 06m
Sun 9/208:10 pm -
1 stop29h 32m
Deal found 8/5![Delta logo]()
$1,297
This Delta deal was found by Cheapflights users on 8/5. 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 12/201:30 pm -
2 stops17h 10m
Wed 12/301:10 pm -
2 stops24h 38m
Deal found 8/5![Delta logo]()
$1,452
This Delta deal was found by Cheapflights users on 8/9. 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 12/166:00 am -
2 stops22h 40m
Wed 12/305:35 pm -
2 stops20h 13m
Deal found 8/9![Delta logo]()
$1,666
This Delta deal was found by Cheapflights users on 8/9. 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 12/1610:00 am -
2 stops18h 40m
Mon 12/285:35 pm -
2 stops20h 13m
Deal found 8/9![Delta logo]()
$1,666
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated August 10, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated August 10, 2026 and is based on user searches.
This American Airlines deal was found by Cheapflights users on 8/8. 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.
Thu 8/1310:22 am -
2 stops20h 23m
Thu 8/2010:30 pm -
2 stops20h 31m
Deal found 8/8![American Airlines logo]()
$1,254
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/166:54 pm -
2 stops35h 06m
Tue 9/229:00 pm -
2 stops20h 38m
Deal found 8/5![United Airlines logo]()
$1,250
This Delta deal was found by Cheapflights users on 8/5. 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 8/1610:44 am -
2 stops21h 46m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,266
This United Airlines deal was found by Cheapflights users on 8/5. 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 8/1711:15 am -
1 stop18h 45m
Mon 9/219:00 pm -
1 stop23h 31m
Deal found 8/5![United Airlines logo]()
$1,228
This Delta deal was found by Cheapflights users on 8/5. 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 8/1712:52 pm -
2 stops18h 48m
Sun 9/208:05 pm -
2 stops29h 37m
Deal found 8/5![Delta logo]()
$1,236
This Delta deal was found by Cheapflights users on 8/5. 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 8/1711:00 am -
1 stop20h 45m
Sun 9/208:10 pm -
1 stop29h 32m
Deal found 8/5![Delta logo]()
$1,267
This KAYAK deal was found by Cheapflights users on 8/5. 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 8/1811:00 am -
2 stops25h 50m
Tue 9/228:05 pm -
2 stops16h 50m
Deal found 8/5![LATAM Airlines logo]()
$1,228
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 8/1812:30 pm -
2 stops19h 10m
Sat 9/198:10 pm -
1 stop14h 50m
Deal found 8/5![Delta logo]()
$1,262
This American Airlines deal was found by Cheapflights users on 8/5. 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.
Wed 8/1912:45 pm -
2 stops18h 00m
Sun 9/2010:15 pm -
2 stops16h 48m
Deal found 8/5![American Airlines logo]()
$1,232
This Delta deal was found by Cheapflights users on 8/5. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 8/215:23 pm -
1 stop14h 22m
Mon 9/218:10 pm -
1 stop19h 13m
Deal found 8/5![Delta logo]()
$1,258
This LATAM Airlines deal was found by Cheapflights users on 8/6. 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.
Sun 9/204:59 pm -
2 stops21h 01m
Sun 9/278:05 pm -
2 stops16h 50m
Deal found 8/6![LATAM Airlines logo]()
$1,258
This oojo deal was found by Cheapflights users on 8/10. 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 9/242:30 pm -
2 stops17h 10m
Wed 9/303:55 am -
2 stops31h 05m
Deal found 8/10![LATAM Airlines logo]()
$1,225
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 10, 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 10, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/7. 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.
Sat 1/93:24 pm -
3 stops37h 11m
Deal found 8/7![Multiple Airlines logo]()
$716
This Avianca deal was found by Cheapflights users on 8/7. 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.
Sat 1/98:25 am -
2 stops18h 15m
Deal found 8/7![Avianca logo]()
$767
This Avianca deal was found by Cheapflights users on 8/10. 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 -
2 stops17h 46m
Deal found 8/10![Avianca logo]()
$769
This FlightHub deal was found by Cheapflights users on 8/5. 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 12/27:04 pm -
2 stops31h 36m
Deal found 8/5![Avianca logo]()
$791
This Kiwi.com deal was found by Cheapflights users on 8/7. 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.
Sat 1/96:59 pm -
3 stops34h 31m
Deal found 8/7![Multiple Airlines logo]()
$792
This United Airlines deal was found by Cheapflights users on 8/9. 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 12/28:50 am -
1 stop21h 30m
Deal found 8/9![United Airlines logo]()
$809
This United Airlines deal was found by Cheapflights users on 8/7. 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 1/95:00 am -
2 stops23h 20m
Deal found 8/7![United Airlines logo]()
$839
This Air Canada deal was found by Cheapflights users on 8/6. 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 12/211:25 am -
3 stops48h 40m
Deal found 8/6![Air Canada logo]()
$1,757
This Air Canada deal was found by Cheapflights users on 8/8. 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 12/27:06 pm -
3 stops40h 59m
Deal found 8/8![Multiple Airlines logo]()
$2,566
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 10, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,148 (Delta) |
One-way from | $716 (Kiwi.com) |
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 August 10, 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
Wed 12/2
10:00 am-7:40 am
2 stops18h 40m
Buenos Aires Jorge Newbery
Thu 12/17
5:35 pm-11:15 am
2 stops20h 40m
$1,148
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sat 1/16
6:59 pm-9:50 am
2 stops35h 51m
Buenos Aires Ministro Pistarini
Thu 1/28
7:20 am-11:39 pm
2 stops19h 19m
$1,187
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Thu 9/17
6:54 pm-6:30 pm
2 stops21h 36m
Buenos Aires Jorge Newbery
Thu 9/24
3:45 pm-9:00 am
2 stops19h 15m
$1,228
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Thu 9/24
12:00 pm-9:45 am
1 stop19h 45m
Buenos Aires Ministro Pistarini
Thu 10/1
8:10 pm-3:54 pm
1 stop21h 44m
$1,228
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Thu 8/20
11:00 am-7:40 am
2 stops18h 40m
Buenos Aires Jorge Newbery
Thu 9/17
6:20 pm-10:55 am
2 stops18h 35m
$1,228
Quickest round-trip
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Thu 9/17
6:54 pm-9:45 am
1 stop12h 51m
Buenos Aires Ministro Pistarini
Thu 9/24
4:45 pm-10:55 am
2 stops20h 10m
$1,228
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 9/20
6:53 pm-8:00 am
2 stops35h 07m
Buenos Aires Ministro Pistarini
Sun 9/27
9:00 pm-2:10 pm
1 stop19h 10m
$1,232
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Thu 8/20
9:15 am-7:40 am
2 stops20h 25m
Buenos Aires Jorge Newbery
Sun 9/20
8:05 pm-11:42 pm
2 stops29h 37m
$1,236
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Fri 8/21
12:52 pm-9:45 am
1 stop18h 53m
Buenos Aires Ministro Pistarini
Thu 9/17
8:10 pm-9:00 am
1 stop14h 50m
$1,258
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sat 8/22
5:33 pm-9:45 am
1 stop14h 12m
Buenos Aires Ministro Pistarini
Mon 9/21
8:10 pm-1:23 pm
1 stop19h 13m
$1,258
Showing 1-10 of 29 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-AEP
STL-EZE
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-AEP
STL-EZE
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 10, 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
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
Reviews
1 / 20
10.0
ExcellentAnonymous,May 2026
SEA - KOA
Crew
8.5
Entertainment
7.8
Overall
7.8
Boarding
8.1
Comfort
7.8
Food
7.2
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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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 10, 2026.
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St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on August 10, 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 10, 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 2,558,603 searches. Data last updated August 10, 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% |