The cheapest times to fly from SEA to SDU are

  • January 8th to April 1st (except the weeks of February 12th and February 19th)
  • May 14th to June 3rd
  • September 3rd to December 9th (except the week of September 24th)

based on data collected exclusively by Champion Traveler across tens of millions of flights. Among all the dates above, the very cheapest time to fly from SEA to SDU is mid to late November. Prices can be as high as $2820 for Friday flights during late July, or as low as $878 for Tuesday flights around mid to late November.


When to Fly to Rio de Janeiro

Flying from Seattle, WA (SEA) to Rio de Janeiro (SDU) will usually cost between $988 to $2155 per person if booking more than four weeks in advance. On average the very cheapest time to fly is mid to late November with an average ticket price of $1081. Due to high demand the most expensive time to fly is late July, with an average price of $2361. Planning your trip to low-cost times can easily save you $1280 on economy flights and even more on first-class flights. Generally, any price below $1447 can be considered a good price for a round-trip SEA to SDU flight.

See below for a graph of average weekly prices for the SEA to SDU route. All prices are for round-trip tickets in USD.

SEA to SDU Flight Prices

Compared to other flights, the SEA to SDU flight is slightly more expensive than the average and costs slightly more than the average flight leaving from Seattle. The average price per mile (for a direct flight) is $0.13, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to fly to SDU, and Wednesday the cheapest day to fly back into SEA. Fridays are the most expensive days to fly to Rio de Janeiro, and Saturdays are the most expensive days to return to Seattle. Selecting flights on the least expensive days could save you up to $271 (15%) on this flight.

Departing prices are for round-trip flights returning on the day of departure. For example, a flight departing on Tuesday and returning a week later will cost an average of $1315. Return trip prices are from the SDU to SEA flight, and often highlight the quality of our data in showing the same trend.

Departing Prices by Day

Departure Day Prices

Return Trip Prices by Day

Return Day Prices


Nonstop Flights and Layovers

Travelers looking to fly from SEA to SDU can generally find a 2-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 13 hour 23 minutes may not be realistic.


Alternative Nearby Airports

Champion Traveler tells you which airports are nearby and whether tickets might be cheaper alternative airports nearby. Sometimes it’s worth it to fly into a closer airport and then commute to your destination. Remember that there is not usually a nonstop flight from SEA to SDU while comparing.

Destination alternative #1: Galeao Antonio Carlos Jobim International Airport (GIG) in Rio de Janeiro

  • 9 miles (14 km) away from SDU
  • Usually 7.98% less expensive than SDU
  • 1-layover flights available

See SEA to GIG flights


Flight Hacking SEA to SDU

Flight hacking is when you book two tickets instead of a layover, sometimes with different airlines. You will need to either bring only a carry-on bag (highly recommended) or leave yourself plenty of time to go through security again. Flight hacking is completely allowed, but airlines don’t always tell you the cheapest way to get from SEA to SDU — but Champion Traveler does!

Hack #1: Chicago, IL (SEA > ORD > SDU)

  • Price for both tickets: $1071
  • Average savings: $376 (25.98%)

See SEA to ORD flights

Hack #2: Miami, FL (SEA > MIA > SDU)

  • Price for both tickets: $1128
  • Average savings: $319 (22.05%)

See SEA to MIA flights

Hack #3: Sao Paulo (SEA > GRU > SDU)

  • Price for both tickets: $1177
  • Average savings: $270 (18.66%)

See SEA to GRU flights


Flight Questions Answered

Still have questions about flying from SEA to SDU? We’ve got answers.

Which airlines fly this route?

You can find 10 major airlines flying this route most often: Aeromexico, Air Canada, Alaska, American, Azul, COPA, Delta, Gol, LATAM, United, and potentially more during busy seasons.

How far away is it from Santos Dumont Airport to Seattle/Tacoma International Airport?

The distance between the two airports is roughly 6891 miles or 11090 kilometers.

How long does it take to fly from SEA to SDU?

The real-world flight time for a nonstop SEA to SDU flight is about 13 hour 23 minutes.

How many flights go between Seattle, WA and Rio de Janeiro?

It depends on the day of the week and the date, but a typical day might have around 80 available flights from SEA to SDU.


Airport Location Info


Departing Airport

Origination code SEA
Origination airport name Seattle/Tacoma International Airport
City Seattle, WA
Country the United States
Latitude 47.5
Longitude -122.3

Return Airport

Destination code SDU
Destination airport name Santos Dumont Airport
City Rio de Janeiro
Country Brazil
Latitude -22.9
Longitude -43.2


Other Resources

Please note that while we’ve worked hard to analyzed tens of millions of flights to get you this data, we do not calculate current live prices or guarantee pricing. Please see our partners using the links above for current offers.