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Santos Dumont

$712+ Cheap flights from St. Louis (STL) to Santos Dumont, Brazil (SDU)

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 10/25. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SDU
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheap flight deals from St. Louis to Santos Dumont

Discover tips and strategies to find the most affordable flight options for your journey from St. Louis (STL) to Santos Dumont (SDU). 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 11, 2025.

Round-trip from

$712
(Mytrip)

Popular in

December

Cheapest in

May

Average price

$1,104
From Lambert-St Louis to Rio de Janeiro Santos Dumont
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Highest demand for flights based on searches. 9% potential increase in price ($110 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($60 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from St. Louis to Santos Dumont

Cheapest flights from St. Louis to Santos Dumont
Explore the most affordable flight options available from St. Louis to Santos Dumont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Mytrip deal was found by Cheapflights users on 9/10. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:15 pmSTL - SDU
2 stops24h 50mMultiple Airlines
Sat 11/110:05 amSDU - STL
2 stops26h 57mMultiple Airlines
Deal found 9/10$712
This Mytrip deal was found by Cheapflights users on 9/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/117:15 pmSTL - SDU
2 stops25h 10mMultiple Airlines
Sat 10/183:15 pmSDU - STL
2 stops20h 47mMultiple Airlines
Deal found 9/9$777
This Flysmarter deal was found by Cheapflights users on 9/11. 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 Flysmarter is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/264:05 pmSTL - SDU
2 stops22h 45mMultiple Airlines
Sun 11/28:30 amSDU - STL
2 stops33h 59mMultiple Airlines
Deal found 9/11$849
This Mytrip deal was found by Cheapflights users on 9/9. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/134:05 pmSTL - SDU
2 stops19h 30mMultiple Airlines
Mon 9/154:55 pmSDU - STL
3 stops24h 23mMultiple Airlines
Deal found 9/9$2,013
This KAYAK deal was found by Cheapflights users on 9/9. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/143:36 pmSTL - SDU
2 stops19h 44mLATAM Airlines
Tue 9/238:20 pmSDU - STL
2 stops15h 39mLATAM Airlines
Deal found 9/9$4,242
This Delta deal was found by Cheapflights users on 9/11. 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 9/141:26 pmSTL - SDU
2 stops18h 09mDelta
Tue 9/238:20 pmSDU - STL
2 stops15h 39mDelta
Deal found 9/11$6,372

Cheapflights Fare Finder

 
Customize your flight search to find flights from St. Louis to Santos Dumont 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 September 11, 2025.
Use the filters below to find and compare flights from St. Louis to Rio de Janeiro Santos Dumont Airport that are best for you.

Fly from

St. Louis

Fly to

Santos Dumont

Route

Depart

Return

Price

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Sat 10/25

7:15 pm-10:05 pm

2 stops24h 50m

Rio de Janeiro Santos Dumont

Sat 11/1

10:05 am-11:02 am

2 stops26h 57m

$712

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Sat 10/11

7:15 pm-10:25 pm

2 stops25h 10m

Rio de Janeiro Santos Dumont

Sat 10/18

3:15 pm-10:02 am

2 stops20h 47m

$777

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Sun 10/26

4:05 pm-4:50 pm

2 stops22h 45m

Rio de Janeiro Santos Dumont

Sun 11/2

8:30 am-3:29 pm

2 stops33h 59m

$849

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Wed 2/18

4:04 pm-10:20 pm

2 stops27h 16m

Rio de Janeiro Santos Dumont

Sun 2/22

3:15 pm-11:46 pm

2 stops35h 31m

$1,309

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Thu 2/12

11:54 am-10:20 pm

2 stops31h 26m

Rio de Janeiro Santos Dumont

Sun 3/1

6:00 am-11:46 pm

2 stops20h 46m

$1,444

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Wed 2/11

4:05 pm-7:40 am

2 stops36h 35m

Rio de Janeiro Santos Dumont

Sat 2/28

6:00 am-9:40 pm

2 stops18h 40m

$1,510

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Best time to book a flight from St. Louis to Santos Dumont

Have a flexible travel schedule? Discover the best time to fly to Santos Dumont from St. Louis with our price prediction graph.
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.

Related info for your journey

Find useful and relevant information for your journey from St. Louis to Santos Dumont. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from St. Louis to Rio de Janeiro Santos Dumont?

    Most people fly from Lambert-St Louis (STL) if they book a flight from St. Louis to Rio de Janeiro Santos Dumont. On average, Lambert-St Louis has 0 outbound flights to Rio de Janeiro Santos Dumont per day from 0 airlines. Lambert-St Louis is conveniently located just 12.7 mi from St. Louis’s city center.

  • Can I find deals for flights from St. Louis to Santos Dumont that include hotel bookings?

    Yes. In addition to deals on St. Louis to Santos Dumont flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from St. Louis to Santos Dumont?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Santos Dumont.

  • Can I find deals for business class flights from St. Louis to Santos Dumont?

    Yes. Cheapflights offers flight deals from St. Louis to Santos Dumont by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

See more FAQs

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Alternative routes for St. Louis to Santos Dumont

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