The cheapest times to fly from STI to SEA are

  • January 8th to April 22nd (except the weeks of March 26th and April 9th)
  • October 8th to December 9th

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 STI to SEA is late January and early February. Prices can be as high as $1992 for Sunday flights during late June, or as low as $510 for Tuesday flights around late January and early February.


When to Fly to Seattle

Flying from Santiago (STI) to Seattle, WA (SEA) will usually cost between $552 to $1089 per person if booking more than four weeks in advance. On average the very cheapest time to fly is late January and early February with an average ticket price of $522. Due to high demand the most expensive time to fly is late June, with an average price of $1274. Planning your trip to low-cost times can easily save you $752 on economy flights and even more on first-class flights. Generally, any price below $820 can be considered a good price for a round-trip STI to SEA flight.

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

STI to SEA Flight Prices

Compared to other flights, the STI to SEA flight is cheaper than the average and costs less than the average flight leaving from Santiago De Los Caballeros. The average price per mile (for a direct flight) is $0.15, which is far below average.


Flight Prices by Day of the Week

Tuesday is usually the cheapest day to depart and return on this flight. Sundays are the most expensive days to fly out or take a return trip. Selecting flights on the least expensive days could save you up to $131 (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 $749. Return trip prices are from the SEA to STI 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 STI to SEA can generally find a 1-layover flight. Because there is not usually a direct flight option the real-world direct flight time of 7 hour 13 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 STI to SEA while comparing.

Destination alternative #1: Portland International Airport (PDX) in Portland, OR

  • 129 miles (208 km) away from SEA
  • Usually 8.96% less expensive than SEA
  • 1-layover flights available

See STI to PDX flights


Flight Hacking STI to SEA

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 STI to SEA — but Champion Traveler does!

Hack #1: New York, NY (STI > JFK > SEA)

  • Price for both tickets: $748
  • Average savings: $73 (8.84%)

See STI to LAX flights

Hack #2: Los Angeles, CA (STI > LAX > SEA)

  • Price for both tickets: $759
  • Average savings: $62 (7.5%)

See STI to JFK flights

Hack #3: San Francisco, CA (STI > SFO > SEA)

  • Price for both tickets: $760
  • Average savings: $61 (7.38%)

See STI to SFO flights


Flight Questions Answered

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

Which airlines fly this route?

You can find 7 major airlines flying this route most often: American, COPA, Delta, Emirates, JetBlue, Spirit, United, and potentially more during busy seasons.

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

The distance between the two airports is roughly 3468 miles or 5581 kilometers.

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

The real-world flight time for a nonstop STI to SEA flight is about 7 hour 13 minutes.

How many flights go between Santiago and Seattle, WA?

It depends on the day of the week and the date, but a typical day might have around 19 available flights from STI to SEA.


Airport Location Info


Departing Airport

Origination codeSTI
Origination airport nameCibao International Airport
CountryDominican Republic

Return Airport

Destination codeSEA
Destination airport nameSeattle/Tacoma International Airport
CitySeattle, WA
Countrythe United States


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.