$593+ Cheap flights from St. Louis (STL) to Buenos Aires (BUE)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/2. Fares are subject to change and may not be available on all flights or dates of travel.
STL — BUE
Oct 22 — Oct 291
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 September 22, 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 September 22, 2026.
This Delta deal was found by Cheapflights users on 9/20. 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 11/912:29 pm -
2 stops24h 31m
Thu 11/195:35 pm -
2 stops20h 40m
Deal found 9/20![Delta logo]()
$1,148
This Delta deal was found by Cheapflights users on 9/19. 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 11/86:00 am -
2 stops22h 40m
Tue 11/175:35 pm -
2 stops18h 25m
Deal found 9/19![Delta logo]()
$1,188
This LATAM Airlines deal was found by Cheapflights users on 9/21. 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 12/1010:06 am -
2 stops21h 34m
Sat 12/1912:50 pm -
2 stops30h 38m
Deal found 9/21![LATAM Airlines logo]()
$1,188
This Delta deal was found by Cheapflights users on 9/20. 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 11/125:30 pm -
2 stops35h 10m
Mon 11/168:40 am -
2 stops29h 35m
Deal found 9/20![Delta logo]()
$1,248
This Delta deal was found by Cheapflights users on 9/19. 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 9/284:59 pm -
1 stop14h 46m
Tue 10/64:45 pm -
2 stops20h 06m
Deal found 9/19![Delta logo]()
$1,248
This United Airlines deal was found by Cheapflights users on 9/18. 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 11/96:50 pm -
2 stops59h 30m
Mon 11/1611:55 pm -
1 stop21h 43m
Deal found 9/18![United Airlines logo]()
$1,271
This Delta deal was found by Cheapflights users on 9/20. 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 11/810:14 am -
2 stops26h 46m
Mon 11/168:40 am -
2 stops35h 03m
Deal found 9/20![Delta logo]()
$1,278
This United Airlines deal was found by Cheapflights users on 9/19. 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 9/238:35 am -
1 stop21h 25m
Sun 10/49:00 pm -
1 stop15h 10m
Deal found 9/19![United Airlines logo]()
$1,278
This United Airlines deal was found by Cheapflights users on 9/18. 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
Wed 10/79:00 pm -
2 stops19h 17m
Deal found 9/18![United Airlines logo]()
$1,301
This LATAM Airlines deal was found by Cheapflights users on 9/19. 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.
Sat 11/710:47 am -
2 stops27h 13m
Sat 11/145:35 pm -
2 stops18h 20m
Deal found 9/19![LATAM Airlines logo]()
$1,308
This United Airlines deal was found by Cheapflights users on 9/21. 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 9/256:15 am -
1 stop23h 45m
Sun 9/279:00 pm -
1 stop15h 10m
Deal found 9/21![United Airlines logo]()
$1,308
This LATAM Airlines deal was found by Cheapflights users on 9/18. 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 11/95:30 pm -
2 stops19h 30m
Mon 11/165:35 pm -
2 stops18h 20m
Deal found 9/18![LATAM Airlines logo]()
$1,336
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 September 22, 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 September 22, 2026.
This Delta deal was found by Cheapflights users on 9/19. 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 11/1010:05 am -
2 stops26h 55m
Tue 11/175:35 pm -
2 stops20h 40m
Deal found 9/19![Delta logo]()
$1,148
This United Airlines deal was found by Cheapflights users on 9/22. 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 1/165:55 pm -
1 stop34h 25m
Mon 1/2511:55 pm -
1 stop17h 10m
Deal found 9/22![United Airlines logo]()
$1,198
This Mytrip deal was found by Cheapflights users on 9/21. 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 11/512:14 pm -
3 stops40h 16m
Thu 11/1210:20 am -
3 stops32h 06m
Deal found 9/21![Multiple Airlines logo]()
$1,409
This LATAM Airlines deal was found by Cheapflights users on 9/21. 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 12/65:31 pm -
2 stops19h 29m
Thu 12/1011:45 am -
2 stops26h 44m
Deal found 9/21![LATAM Airlines logo]()
$1,471
This Delta deal was found by Cheapflights users on 9/19. 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 11/1010:05 am -
2 stops18h 35m
Mon 11/165:35 pm -
2 stops22h 48m
Deal found 9/19![Delta logo]()
$1,248
This United Airlines deal was found by Cheapflights users on 9/19. 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 11/96:50 pm -
2 stops59h 30m
Mon 11/1611:55 pm -
1 stop21h 43m
Deal found 9/19![United Airlines logo]()
$1,271
This Delta deal was found by Cheapflights users on 9/20. 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 11/117:08 am -
2 stops21h 32m
Mon 11/168:40 am -
2 stops31h 43m
Deal found 9/20![Delta logo]()
$1,248
This United Airlines deal was found by Cheapflights users on 9/18. 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
Wed 10/79:00 pm -
2 stops19h 17m
Deal found 9/18![United Airlines logo]()
$1,301
This LATAM Airlines deal was found by Cheapflights users on 9/21. 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 12/1710:06 am -
2 stops21h 49m
Fri 1/2211:35 pm -
1 stop14h 13m
Deal found 9/21![Multiple Airlines logo]()
$1,490
This Delta deal was found by Cheapflights users on 9/19. 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 11/92:31 pm -
2 stops22h 29m
Sun 11/158:05 pm -
2 stops30h 51m
Deal found 9/19![Delta logo]()
$1,248
This Delta deal was found by Cheapflights users on 9/21. 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 11/57:00 am -
2 stops21h 40m
Thu 11/125:35 pm -
2 stops20h 40m
Deal found 9/21![Delta logo]()
$1,248
This United Airlines deal was found by Cheapflights users on 9/20. 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 12/68:02 am -
2 stops20h 18m
Thu 12/1010:05 pm -
2 stops19h 36m
Deal found 9/20![United Airlines logo]()
$1,475
This Delta deal was found by Cheapflights users on 9/20. 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 11/125:30 pm -
2 stops35h 10m
Mon 11/168:40 am -
2 stops29h 35m
Deal found 9/20![Delta logo]()
$1,248
This Delta deal was found by Cheapflights users on 9/19. 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 11/116:00 am -
2 stops22h 40m
Sun 11/158:05 pm -
2 stops30h 51m
Deal found 9/19![Delta logo]()
$1,248
This Delta deal was found by Cheapflights users on 9/20. 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 11/810:14 am -
2 stops26h 46m
Mon 11/168:40 am -
2 stops35h 03m
Deal found 9/20![Delta logo]()
$1,278
This Delta deal was found by Cheapflights users on 9/22. 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 2/119:00 am -
2 stops19h 40m
Wed 3/35:35 pm -
2 stops20h 13m
Deal found 9/22![Delta logo]()
$1,386
Last-minute flights from St. Louis to Buenos AiresDiscover last-minute flight deals from St. Louis to Buenos Aires. Data last updated September 22, 2026 and is based on user searches.
Discover last-minute flight deals from St. Louis to Buenos Aires. Data last updated September 22, 2026 and is based on user searches.
This LATAM Airlines deal was found by Cheapflights users on 9/19. 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 9/2310:05 am -
2 stops20h 25m
Sun 10/45:35 pm -
2 stops26h 10m
Deal found 9/19![LATAM Airlines logo]()
$1,248
This United Airlines deal was found by Cheapflights users on 9/19. 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 9/238:35 am -
1 stop21h 25m
Sun 10/49:00 pm -
1 stop15h 10m
Deal found 9/19![United Airlines logo]()
$1,278
This United Airlines deal was found by Cheapflights users on 9/21. 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 9/256:15 am -
1 stop23h 45m
Sun 9/279:00 pm -
1 stop15h 10m
Deal found 9/21![United Airlines logo]()
$1,308
This Delta deal was found by Cheapflights users on 9/19. 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 9/2812:00 pm -
1 stop19h 45m
Tue 10/68:10 pm -
1 stop16h 41m
Deal found 9/19![Delta logo]()
$1,248
This KAYAK deal was found by Cheapflights users on 9/19. 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 9/2810:27 am -
2 stops19h 33m
Tue 10/69:00 pm -
2 stops19h 17m
Deal found 9/19![Multiple Airlines logo]()
$1,336
This Kiwi.com deal was found by Cheapflights users on 9/18. 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 10/112:00 pm -
1 stop19h 45m
Thu 10/151:40 pm -
2 stops30h 00m
Deal found 9/18![Multiple Airlines logo]()
$1,355
This United Airlines deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:12 pm -
1 stop14h 48m
Thu 10/159:00 pm -
1 stop15h 10m
Deal found 9/18![United Airlines logo]()
$1,389
This United Airlines deal was found by Cheapflights users on 9/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/13:12 pm -
1 stop14h 48m
Mon 10/59:00 pm -
1 stop15h 10m
Deal found 9/19![United Airlines logo]()
$1,412
This Ovago deal was found by Cheapflights users on 9/18. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:11 pm -
2 stops22h 09m
Thu 10/156:20 pm -
2 stops23h 25m
Deal found 9/18![GOL logo]()
$1,584
This Ovago deal was found by Cheapflights users on 9/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Ovago is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/15:11 pm -
2 stops22h 09m
Sat 10/106:20 pm -
2 stops25h 07m
Deal found 9/21![GOL logo]()
$1,616
This LATAM Airlines deal was found by Cheapflights users on 9/18. 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.
Sat 10/36:00 am -
2 stops23h 40m
Wed 10/78:05 pm -
2 stops16h 46m
Deal found 9/18![LATAM Airlines logo]()
$1,278
This United Airlines deal was found by Cheapflights users on 9/18. 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
Wed 10/79:00 pm -
1 stop19h 10m
Deal found 9/18![United Airlines logo]()
$1,301
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 September 22, 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 September 22, 2026.
This KAYAK deal was found by Cheapflights users on 9/18. 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 12/26:30 am -
2 stops39h 22m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Copa Airlines logo]()
$593
This KAYAK deal was found by Cheapflights users on 9/20. 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 12/71:18 pm -
2 stops36h 07m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Copa Airlines logo]()
$605
This Ovago deal was found by Cheapflights users on 9/20. 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.
Sun 3/711:19 am -
2 stops22h 41m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![GOL logo]()
$797
This Air Canada deal was found by Cheapflights users on 9/18. 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
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$811
This KAYAK deal was found by Cheapflights users on 9/20. 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 3/78:33 am -
2 stops27h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Copa Airlines logo]()
$813
This LATAM Airlines deal was found by Cheapflights users on 9/18. 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 stops26h 27m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![LATAM Airlines logo]()
$819
This LATAM Airlines deal was found by Cheapflights users on 9/18. 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 12/212:36 pm -
1 stop15h 59m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$819
This FlightHub deal was found by Cheapflights users on 9/20. 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.
Sun 3/77:00 am -
3 stops29h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/20![Air Canada logo]()
$1,108
This Air Canada deal was found by Cheapflights users on 9/18. 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.
Mon 12/76:55 pm -
3 stops41h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/18![Multiple Airlines logo]()
$1,122
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 September 22, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $1,148 (Delta) |
One-way from | $593 (KAYAK) |
Popular in | May |
Cheapest in | March |
Average price | $1,198 |
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 September 22, 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 - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Wed 12/2
6:30 am-8:00 am
2 stops22h 30m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$593
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Mon 12/7
5:25 am-8:00 am
2 stops23h 35m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$664
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Sun 3/7
11:19 am-1:00 pm
2 stops22h 41m
Buenos Aires Jorge Newbery
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$797
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Wed 12/2
4:05 pm-5:40 pm
2 stops22h 35m
Buenos Aires Jorge Newbery
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$811
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 3/7
8:33 am-3:00 pm
2 stops27h 27m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$813
St. LouisBuenos Aires
STL Lambert-St Louis - AEP Buenos Aires Jorge Newbery
STLAEP
Lambert-St Louis
Mon 12/7
2:33 pm-8:00 pm
2 stops26h 27m
Buenos Aires Jorge Newbery
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$819
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Sun 3/7
6:00 am-8:30 am
1 stop23h 30m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$819
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Mon 12/7
10:04 am-9:40 am
1 stop20h 36m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$819
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Mon 12/7
8:30 am-9:20 am
1 stop21h 50m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$819
Quickest round-trip
St. LouisBuenos Aires
STL Lambert-St Louis - EZE Buenos Aires Ministro Pistarini
STLEZE
Lambert-St Louis
Wed 12/2
12:36 pm-7:35 am
1 stop15h 59m
Buenos Aires Ministro Pistarini
Wed 12/31
12:00 am-9:00 pm
Nonstop0h 00m
$819
Showing 1-10 of 26 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 September.
| 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 September 22, 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.
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
Food
7.2
Crew
8.5
Comfort
7.8
Entertainment
7.8
Boarding
8.1
Overall
7.8
Reviews
1 / 20
4.0
OkayJennifer,Sep 2026
ORD - LGA
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 September 22, 2026.
Complete your trip
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St. Louis and Buenos Aires flights
Browse other St. Louis and Buenos Aires flight options. Last updated on September 22, 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 September 22, 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 September 22, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$884 | Average$1,173 | FlexibilityNo cancel fee | On-time81% | |
| Cheapest$1,147 | Average$1,327 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$1,147 | Average$1,550 | FlexibilityNo cancel fee | On-timeN/A |