In terms of precipitation, rainfall in Washington, D.C. Dulles Intl Airport ranges from 2.6 - 4.0 inches per month. May is typically the wettest month, when rainfall can reach 4.0 in. February is typically the driest time to visit Washington, D.C. Dulles Intl Airport when rainfall is around 2.6 in.

If weather is an important factor for your trip to Washington, D.C. Dulles Intl Airport, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 35.6 F).

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

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

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

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

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

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

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

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

$276+ Flights from Rio de Janeiro Santos Dumont Airport, Brazil to Washington, D.C. Dulles Intl Airport

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Cheap flight deals from Santos Dumont to Dulles Intl

Cheapest flights from Santos Dumont to Dulles Intl
Explore the most affordable flight options available from Santos Dumont to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2026.

Sun 3/88:30 am

SDU

IAD

2 stops21h 55m

Multiple Airlines

Sun 3/156:45 am

IAD

SDU

2 stops33h 00m

Multiple Airlines

Deal found 1/22

$612

Mon 3/91:50 pm

SDU

IAD

2 stops25h 25m

Multiple Airlines

Mon 3/166:45 am

IAD

SDU

2 stops23h 55m

Multiple Airlines

Deal found 1/23

$616

Thu 3/121:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Mon 3/1611:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Deal found 1/20

$665

Sat 2/285:30 pm

SDU

IAD

1 stop15h 05m

United Airlines

Tue 3/105:50 pm

IAD

SDU

2 stops21h 50m

United Airlines

Deal found 1/21

$666

Thu 2/197:45 am

SDU

IAD

2 stops22h 40m

Multiple Airlines

Fri 2/275:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Deal found 1/21

$692

Fri 2/205:25 pm

SDU

IAD

3 stops34h 15m

Multiple Airlines

Fri 2/275:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Deal found 1/21

$694

Wed 2/187:00 pm

SDU

IAD

2 stops20h 15m

Multiple Airlines

Wed 2/255:45 am

IAD

SDU

2 stops23h 55m

Multiple Airlines

Deal found 1/21

$734

Best flights from Santos Dumont to Dulles Intl
Discover carefully curated flight deals from Santos Dumont to Dulles Intl that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated January 23, 2026.

Mon 3/91:50 pm

SDU

IAD

2 stops25h 25m

Multiple Airlines

Mon 3/166:45 am

IAD

SDU

2 stops23h 55m

Multiple Airlines

Deal found 1/23

$616

Thu 3/121:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Mon 3/1611:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Deal found 1/20

$665

Sat 2/285:30 pm

SDU

IAD

1 stop15h 05m

United Airlines

Tue 3/105:50 pm

IAD

SDU

2 stops21h 50m

United Airlines

Deal found 1/21

$666

Mon 3/91:45 pm

SDU

IAD

1 stop17h 55m

United Airlines

Mon 3/1611:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Deal found 1/23

$666

Last-minute flights from Santos Dumont to Dulles Intl
Discover last-minute flight deals from Santos Dumont to Dulles Intl. Data last updated January 23, 2026 and is based on user searches.

Wed 2/47:00 pm

SDU

IAD

2 stops22h 04m

Azul

Wed 2/184:05 pm

IAD

SDU

2 stops18h 55m

Azul

Deal found 1/22

$1,261

Thu 2/1211:20 am

SDU

IAD

2 stops35h 09m

Air Canada

Sun 2/229:45 am

IAD

SDU

2 stops29h 00m

Air Canada

Deal found 1/22

$1,349

Wed 2/187:00 pm

SDU

IAD

2 stops20h 15m

Multiple Airlines

Wed 2/255:45 am

IAD

SDU

2 stops23h 55m

Multiple Airlines

Deal found 1/21

$734

Thu 2/197:45 am

SDU

IAD

2 stops22h 40m

Multiple Airlines

Fri 2/275:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Deal found 1/21

$692

Fri 2/205:25 pm

SDU

IAD

3 stops34h 15m

Multiple Airlines

Fri 2/275:45 am

IAD

SDU

2 stops23h 20m

Multiple Airlines

Deal found 1/21

$694

Sat 2/285:30 pm

SDU

IAD

1 stop15h 05m

United Airlines

Tue 3/1011:30 pm

IAD

SDU

1 stop16h 10m

United Airlines

Deal found 1/21

$666

Sat 2/288:05 pm

SDU

IAD

2 stops17h 39m

LATAM Airlines

Tue 3/107:29 pm

IAD

SDU

2 stops16h 46m

LATAM Airlines

Deal found 1/21

$1,563

One-way flights from Santos Dumont to Dulles Intl
Search for one-way flight options from Santos Dumont to Dulles Intl. Find affordable one-way fares based on user searches. Data last updated January 23, 2026.

Sun 5/241:55 pm

SDU

IAD

2 stops25h 04m

LATAM Airlines

Deal found 1/21

$276

Sun 2/12:50 pm

SDU

IAD

1 stop17h 45m

United Airlines

Deal found 1/22

$344

Tue 5/261:45 pm

SDU

IAD

2 stops25h 18m

United Airlines

Deal found 1/21

$352

Wed 4/81:45 pm

SDU

IAD

3 stops32h 33m

Multiple Airlines

Deal found 1/22

$372

Tue 4/78:15 am

SDU

IAD

2 stops22h 20m

Multiple Airlines

Deal found 1/20

$394

Thu 4/91:45 pm

SDU

IAD

2 stops25h 15m

Multiple Airlines

Deal found 1/22

$403

Mon 4/61:45 pm

SDU

IAD

2 stops25h 15m

Multiple Airlines

Deal found 1/20

$404

Find flight deals from Santos Dumont to Dulles Intl

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 1 star
Round-trip from	$612 (Mytrip)
One-way from	$276 (LATAM Airlines)
Popular in	June
Cheapest in	March
Average price	$527

Provider with most accurate pricing for Rio de Janeiro (RIO)-Washington, D.C. (WAS) flight deals.

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Provider most trusted by Cheapflights users for Rio de Janeiro (RIO)-Washington, D.C. (WAS) flights.

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

Search Deals

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

Search Deals

Highest demand for flights based on searches. 15% potential increase in price ($106 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($16 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 Rio de Janeiro Santos Dumont Airport to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Mon 3/9

1:50 pm-2:15 pm

2 stops25h 25m

Washington, D.C. Dulles Intl

Mon 3/16

6:45 am-7:40 am

2 stops23h 55m

$616

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Thu 3/12

1:45 pm-6:40 am

1 stop17h 55m

Washington, D.C. Dulles Intl

Mon 3/16

11:30 pm-4:40 pm

1 stop16h 10m

$665

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Sat 2/28

5:30 pm-6:35 am

1 stop15h 05m

Washington, D.C. Dulles Intl

Tue 3/10

5:50 pm-4:40 pm

2 stops21h 50m

$666

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Mon 3/9

1:45 pm-6:40 am

1 stop17h 55m

Washington, D.C. Dulles Intl

Mon 3/16

11:30 pm-4:40 pm

1 stop16h 10m

$666

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Sun 5/24

1:55 pm-1:59 pm

2 stops25h 04m

$276

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Sun 2/1

2:50 pm-6:35 am

1 stop17h 45m

$344

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Sat 5/23

5:30 pm-6:25 am

1 stop13h 55m

$346

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Tue 5/26

1:45 pm-6:25 am

1 stop17h 40m

$346

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Tue 4/7

8:15 am-5:35 am

2 stops22h 20m

$394

Rio de JaneiroWashington, D.C.

SDU - IAD

SDUIAD

Rio de Janeiro Santos Dumont

Wed 4/8

1:45 pm-2:00 pm

2 stops25h 15m

$401

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/21

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

Have a flexible travel schedule? Discover the best time to fly to Dulles Intl from Santos Dumont 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 Rio de Janeiro Santos Dumont Airport to Washington, D.C. Dulles Intl Airport?
Departing from Rio de Janeiro Santos Dumont Airport to Washington, D.C. Dulles Intl Airport will take you 17h 55m. There are 4811 mi between Rio de Janeiro Santos Dumont Airport and Washington, D.C. Dulles Intl Airport.
Can I find deals for flights from Santos Dumont to Dulles Intl that include hotel bookings?
Yes. In addition to deals on Santos Dumont to Dulles Intl flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Santos Dumont to Dulles Intl?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Santos Dumont to Dulles Intl.
Can I find deals for business class flights from Santos Dumont to Dulles Intl?
Yes. Cheapflights offers flight deals from Santos Dumont to Dulles Intl 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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$276+ Cheap flights from Santos Dumont, Brazil (SDU) to Dulles Intl (IAD)

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 5/24. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Santos Dumont to Dulles Intl with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Santos Dumont to Dulles Intl

Cheapest flights from Santos Dumont to Dulles IntlExplore the most affordable flight options available from Santos Dumont to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2026.

Explore the most affordable flight options available from Santos Dumont to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2026.

Find flight deals from Santos Dumont to Dulles Intl

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 Rio de Janeiro Santos Dumont Airport to Washington, D.C. Dulles Intl Airport that are best for you.

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

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

Related info for your journey

Find useful and relevant information for your journey from Santos Dumont to Dulles Intl. 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 Rio de Janeiro Santos Dumont Airport to Washington, D.C. Dulles Intl Airport?

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

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

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

Traveling to a place near Washington, D.C. Dulles Intl Airport?

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Cheapest flights from Santos Dumont to Dulles Intl
Explore the most affordable flight options available from Santos Dumont to Dulles Intl. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 23, 2026.