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.

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).

What is the cheapest time of day to fly from IAD to SDU?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport as you normally would.

Most accurate provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flight searches over the past month and is updated monthly.

Most trusted provider : When it comes to deals on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport 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 Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Can I find deals for flights from Dulles Intl to Santos Dumont that include hotel bookings?

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

How can I find direct flights from Dulles Intl to Santos Dumont?

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

Can I find deals for business class flights from Dulles Intl to Santos Dumont?

Yes. Cheapflights offers flight deals from Dulles Intl 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.

$237+ Flights from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport, Brazil

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Cheap flight deals from Dulles Intl to Santos Dumont

Cheapest flights from Dulles Intl to Santos Dumont
Explore the most affordable flight options available from Dulles Intl to Santos Dumont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Fri 3/65:45 am

IAD

SDU

2 stops24h 10m

Multiple Airlines

Tue 3/101:50 pm

SDU

IAD

2 stops25h 25m

Multiple Airlines

Deal found 1/24

$542

Wed 3/116:45 am

IAD

SDU

2 stops33h 00m

Multiple Airlines

Wed 3/188:15 am

SDU

IAD

2 stops31h 00m

Multiple Airlines

Deal found 1/26

$563

Fri 5/1512:30 pm

IAD

SDU

2 stops23h 40m

LATAM Airlines

Tue 5/268:15 pm

SDU

IAD

2 stops23h 30m

LATAM Airlines

Deal found 1/23

$583

Wed 2/255:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Tue 3/31:50 pm

SDU

IAD

3 stops27h 05m

Multiple Airlines

Deal found 1/25

$586

Thu 3/52:35 pm

IAD

SDU

2 stops22h 20m

Multiple Airlines

Sun 3/158:30 am

SDU

IAD

2 stops21h 55m

Multiple Airlines

Deal found 1/25

$593

Tue 3/313:25 pm

IAD

SDU

2 stops29h 25m

Multiple Airlines

Wed 4/810:35 am

SDU

IAD

2 stops28h 25m

Multiple Airlines

Deal found 1/24

$605

Mon 3/307:00 am

IAD

SDU

2 stops23h 15m

Multiple Airlines

Wed 4/810:35 am

SDU

IAD

2 stops28h 25m

Multiple Airlines

Deal found 1/24

$612

Best flights from Dulles Intl to Santos Dumont
Discover carefully curated flight deals from Dulles Intl to Santos Dumont that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 26, 2026.

Wed 2/255:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Tue 3/38:15 am

SDU

IAD

2 stops22h 10m

Multiple Airlines

Deal found 1/25

$606

Wed 3/1111:30 pm

IAD

SDU

1 stop16h 15m

United Airlines

Wed 3/181:50 pm

SDU

IAD

1 stop17h 50m

United Airlines

Deal found 1/25

$728

Sun 5/1010:30 pm

IAD

SDU

1 stop17h 15m

United Airlines

Mon 5/251:45 pm

SDU

IAD

1 stop17h 40m

United Airlines

Deal found 1/23

$728

Tue 3/310:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Mon 3/91:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Deal found 1/25

$728

Tue 3/310:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Wed 3/111:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Deal found 1/24

$728

Fri 3/610:30 pm

IAD

SDU

1 stop34h 40m

United Airlines

Thu 3/121:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Deal found 1/26

$728

Sun 3/1511:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Wed 3/251:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Deal found 1/24

$728

Sun 5/2410:30 pm

IAD

SDU

1 stop17h 15m

United Airlines

Mon 6/11:45 pm

SDU

IAD

1 stop17h 40m

United Airlines

Deal found 1/24

$728

Mon 5/1110:30 pm

IAD

SDU

1 stop17h 15m

United Airlines

Mon 5/251:45 pm

SDU

IAD

1 stop17h 40m

United Airlines

Deal found 1/23

$728

Last-minute flights from Dulles Intl to Santos Dumont
Discover last-minute flight deals from Dulles Intl to Santos Dumont. Data last updated January 26, 2026 and is based on user searches.

Sat 1/3110:06 pm

IAD

SDU

2 stops38h 29m

Air Canada

Wed 2/411:20 am

SDU

IAD

2 stops35h 34m

Air Canada

Deal found 1/25

$637

Sat 1/3110:06 pm

IAD

SDU

2 stops38h 29m

Air Canada

Mon 2/911:20 am

SDU

IAD

2 stops35h 34m

Air Canada

Deal found 1/25

$638

Sat 1/3110:06 pm

IAD

SDU

2 stops38h 29m

Air Canada

Thu 2/511:20 am

SDU

IAD

2 stops26h 28m

Air Canada

Deal found 1/25

$642

Mon 2/212:23 pm

IAD

SDU

2 stops22h 52m

Delta

Sat 2/78:05 pm

SDU

IAD

2 stops17h 38m

Delta

Deal found 1/25

$781

Mon 2/231:02 pm

IAD

SDU

2 stops25h 38m

United Airlines

Mon 3/21:45 pm

SDU

IAD

1 stop18h 50m

United Airlines

Deal found 1/24

$778

Wed 2/255:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Tue 3/31:50 pm

SDU

IAD

3 stops27h 05m

Multiple Airlines

Deal found 1/25

$586

Wed 2/2510:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Tue 3/31:45 pm

SDU

IAD

1 stop18h 50m

United Airlines

Deal found 1/25

$773

Thu 2/262:35 pm

IAD

SDU

2 stops24h 10m

Multiple Airlines

Wed 3/1110:00 am

SDU

IAD

3 stops29h 15m

Multiple Airlines

Deal found 1/25

$706

Thu 2/2610:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Thu 3/121:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Deal found 1/26

$782

One-way flights from Dulles Intl to Santos Dumont
Search for one-way flight options from Dulles Intl to Santos Dumont. Find affordable one-way fares based on user searches. Data last updated January 26, 2026.

Fri 4/37:00 am

IAD

SDU

2 stops36h 15m

Multiple Airlines

Deal found 1/25

$237

Tue 5/123:25 pm

IAD

SDU

2 stops15h 15m

Multiple Airlines

Deal found 1/23

$238

Thu 5/213:25 pm

IAD

SDU

2 stops39h 30m

Multiple Airlines

Deal found 1/24

$242

Sun 5/247:00 am

IAD

SDU

2 stops35h 20m

GOL

Deal found 1/24

$243

Mon 3/25:45 am

IAD

SDU

2 stops23h 55m

Multiple Airlines

Deal found 1/25

$260

Sun 3/12:35 pm

IAD

SDU

2 stops24h 10m

Multiple Airlines

Deal found 1/25

$262

Thu 3/52:35 pm

IAD

SDU

2 stops15h 05m

Multiple Airlines

Deal found 1/25

$268

Fri 3/276:45 am

IAD

SDU

2 stops36h 30m

Multiple Airlines

Deal found 1/25

$329

Wed 4/227:00 am

IAD

SDU

2 stops23h 40m

Multiple Airlines

Deal found 1/24

$340

Find flight deals from Dulles Intl to Santos Dumont

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$563 (Mytrip)
One-way from	$237 (Trip.com)
Popular in	June
Cheapest in	May
Average price	$722

Provider with most accurate pricing for Washington, D.C. Dulles Intl-Rio de Janeiro Santos Dumont flight deals.

Search Deals

Provider most trusted by Cheapflights users for Washington, D.C. Dulles Intl-Rio de Janeiro Santos Dumont flights.

Search Deals

From Washington, D.C. Dulles Intl to Rio de Janeiro Santos Dumont

Search Deals

One-way flight from Washington, D.C. Dulles Intl to Rio de Janeiro Santos Dumont

Search Deals

Highest demand for flights based on searches. 4% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 1% potential price decrease ($14 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in January 2026

Search Deals

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Wed 2/25

5:45 am-7:05 am

2 stops23h 20m

Rio de Janeiro Santos Dumont

Tue 3/3

8:15 am-4:25 am

2 stops22h 10m

$606

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Wed 3/11

11:30 pm-4:45 pm

1 stop16h 15m

Rio de Janeiro Santos Dumont

Wed 3/18

1:50 pm-6:40 am

1 stop17h 50m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Sun 5/10

10:30 pm-4:45 pm

1 stop17h 15m

Rio de Janeiro Santos Dumont

Mon 5/25

1:45 pm-6:25 am

1 stop17h 40m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Tue 3/3

10:30 pm-4:40 pm

1 stop16h 10m

Rio de Janeiro Santos Dumont

Mon 3/9

1:45 pm-6:40 am

1 stop17h 55m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Tue 3/3

10:30 pm-4:40 pm

1 stop16h 10m

Rio de Janeiro Santos Dumont

Wed 3/11

1:45 pm-6:40 am

1 stop17h 55m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Fri 3/6

10:30 pm-11:10 am

1 stop34h 40m

Rio de Janeiro Santos Dumont

Thu 3/12

1:45 pm-6:40 am

1 stop17h 55m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Sun 3/15

11:30 pm-4:40 pm

1 stop16h 10m

Rio de Janeiro Santos Dumont

Wed 3/25

1:45 pm-6:40 am

1 stop17h 55m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Sun 5/24

10:30 pm-4:45 pm

1 stop17h 15m

Rio de Janeiro Santos Dumont

Mon 6/1

1:45 pm-6:25 am

1 stop17h 40m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Mon 5/11

10:30 pm-4:45 pm

1 stop17h 15m

Rio de Janeiro Santos Dumont

Mon 5/25

1:45 pm-6:25 am

1 stop17h 40m

$728

Washington, D.C.Rio de Janeiro

IAD - SDU

IADSDU

Washington, D.C. Dulles Intl

Fri 3/27

6:45 am-8:15 pm

2 stops36h 30m

$329

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/25

Showing 1-10 of 17 results

Most accurate provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport flight searches over the past month and is updated monthly.
Most trusted provider: When it comes to deals on Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport 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 Washington, D.C. Dulles Intl Airport-Rio de Janeiro Santos Dumont Airport 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 Dulles Intl to Santos Dumont

Have a flexible travel schedule? Discover the best time to fly to Santos Dumont from Dulles Intl 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

How long is the flight from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport?
A quick flight from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport can take about 16h 15m. United Airlines provides one of the quickest options available for as low as $728. The distance between Washington, D.C. Dulles Intl Airport and Rio de Janeiro Santos Dumont Airport is about 4811 mi.
Can I find deals for flights from Dulles Intl to Santos Dumont that include hotel bookings?
Yes. In addition to deals on Dulles Intl to Santos Dumont flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Dulles Intl to Santos Dumont?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Dulles Intl to Santos Dumont.
Can I find deals for business class flights from Dulles Intl to Santos Dumont?
Yes. Cheapflights offers flight deals from Dulles Intl 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.

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$237+ Cheap flights from Dulles Intl (IAD) to Santos Dumont, Brazil (SDU)

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 4/3. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Dulles Intl to Santos Dumont with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Dulles Intl to Santos Dumont

Cheapest flights from Dulles Intl to Santos DumontExplore the most affordable flight options available from Dulles Intl to Santos Dumont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Explore the most affordable flight options available from Dulles Intl to Santos Dumont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.

Find flight deals from Dulles Intl to Santos Dumont

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Cheapflights Fare Finder

Use the filters below to find and compare flights from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport that are best for you.

Best time to book a flight from Dulles Intl to Santos Dumont

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

Related info for your journey

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

How long is the flight from Washington, D.C. Dulles Intl Airport to Rio de Janeiro Santos Dumont Airport?

Can I find deals for flights from Dulles Intl to Santos Dumont that include hotel bookings?

How can I find direct flights from Dulles Intl to Santos Dumont?

Can I find deals for business class flights from Dulles Intl to Santos Dumont?

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Cheapest flights from Dulles Intl to Santos Dumont
Explore the most affordable flight options available from Dulles Intl to Santos Dumont. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 26, 2026.