HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Santos Dumont

$992+ 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 8/8. Fares are subject to change and may not be available on all flights or dates of travel.
STL — SDU
Jun 19 — Jun 261
Thu 6/19
Thu 6/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from St. Louis to Santos Dumont 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 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 June 14, 2025.

Round-trip from

$992
(Mytrip)

Popular in

December

Cheapest in

May

Average price

$1,176
From Lambert-St Louis to Rio de Janeiro Santos Dumont
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($84 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease ($53 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 2025
Search Deals

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 June 14, 2025.

This Mytrip deal was found by Cheapflights users on 6/12. 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.
Fri 8/810:47 amSTL - SDU
3 stops44h 23mMultiple Airlines
Fri 8/1511:25 amSDU - STL
2 stops34h 15mMultiple Airlines
Deal found 6/12$992
This KAYAK deal was found by Cheapflights users on 6/12. 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.
Fri 8/81:29 pmSTL - SDU
2 stops18h 06mLATAM Airlines
Fri 8/158:20 pmSDU - STL
2 stops18h 11mLATAM Airlines
Deal found 6/12$1,346
This United Airlines deal was found by Cheapflights users on 6/13. 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 6/268:25 amSTL - SDU
2 stops29h 25mUnited Airlines
Sat 7/51:00 pmSDU - STL
2 stops23h 40mUnited Airlines
Deal found 6/13$1,394
This Air Canada deal was found by Cheapflights users on 6/13. 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 6/251:30 pmSTL - SDU
2 stops24h 20mAir Canada
Wed 7/97:55 amSDU - STL
2 stops37h 50mAir Canada
Deal found 6/13$1,905

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 June 14, 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

Fri 8/8

10:47 am-9:10 am

3 stops44h 23m

Rio de Janeiro Santos Dumont

Fri 8/15

11:25 am-7:40 pm

2 stops34h 15m

$992

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Fri 8/8

1:29 pm-9:35 am

2 stops18h 06m

Rio de Janeiro Santos Dumont

Fri 8/15

8:20 pm-12:31 pm

2 stops18h 11m

$1,346

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Thu 6/26

8:25 am-3:50 pm

2 stops29h 25m

Rio de Janeiro Santos Dumont

Sat 7/5

1:00 pm-10:40 am

2 stops23h 40m

$1,394

St. LouisRio de Janeiro

STL - SDU

STLSDU

Lambert-St Louis

Wed 6/25

1:30 pm-3:50 pm

2 stops24h 20m

Rio de Janeiro Santos Dumont

Wed 7/9

7:55 am-7:45 pm

2 stops37h 50m

$1,905

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/12

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.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Rio de Janeiro Santos Dumont Airport

Rainfall in Santos Dumont by month

Plan your trip to Santos Dumont by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Rio de Janeiro Santos Dumont Airport ranges from 1.6 - 5.1 inches per month. January is typically the wettest month, when rainfall can reach 5.1 in. July is typically the driest time to visit Rio de Janeiro Santos Dumont Airport when rainfall is around 1.6 in.

Temperature in Santos Dumont by month

Plan your trip to Santos Dumont by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Rio de Janeiro Santos Dumont Airport, use this chart to help with planning. For those seeking warmer temperatures, February is the ideal time of year to visit, when temperatures reach an average of 82.4 F. Travelers looking to avoid the cold should look outside of June, when temperatures are typically at their lowest (around 69.8 F).

Reviews of airlines servicing Santos Dumont

Get insights into the airlines that provide service to Santos Dumont. 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 Santos Dumont. Reviews last updated June 14, 2025.
LATAM Airlines
7.5
Good
1,785 reviews

Overall

7.5

Food

6.7

Entertainment

7.0

Comfort

7.4

Boarding

7.6

Crew

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2025

MCO - BOG

The problem was the delayed departure for airport reason I understood it was not a Latam responsibility. The crew could give something to drink and not only a candy.
LATAM Airlines
7.5
Good
1,785 reviews
LATAM Airlines
7.5
Good
1,785 reviews

Overall

7.5

Food

6.7

Entertainment

7.0

Comfort

7.4

Boarding

7.6

Crew

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2025

MCO - BOG

The problem was the delayed departure for airport reason I understood it was not a Latam responsibility. The crew could give something to drink and not only a candy.
United Airlines
7.4
Good
8,793 reviews
LATAM Airlines
7.5
Good
1,785 reviews

Overall

7.5

Food

6.7

Entertainment

7.0

Comfort

7.4

Boarding

7.6

Crew

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2025

MCO - BOG

The problem was the delayed departure for airport reason I understood it was not a Latam responsibility. The crew could give something to drink and not only a candy.
Air Canada
7.1
Good
9,548 reviews
LATAM Airlines
7.5
Good
1,785 reviews

Overall

7.5

Food

6.7

Entertainment

7.0

Comfort

7.4

Boarding

7.6

Crew

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Mar 2025

MCO - BOG

The problem was the delayed departure for airport reason I understood it was not a Latam responsibility. The crew could give something to drink and not only a candy.

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for St. Louis to Santos Dumont

See prices for flight routes from nearby airports that may be better suited for you.
St. Louis to Rio de Janeiro–Galeão Intl flights
Kansas City to Rio de Janeiro–Galeão Intl flights
Kansas City to Santos Dumont flights

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.