The flight distance from Ronald Reagan Washington National Airport to Seattle-Tacoma International Airport is:

2,328 miles / 3 747 km

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Flight path from DCA to SEA

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Distance from DCA to SEA

The total distance from DCA to SEA is 2,328 miles.

This is equivalent to 3 747 kilometers or 2,023 nautical miles.

Your trip begins at Ronald Reagan Washington National Airport in Washington, District of Columbia.
It ends at Seattle-Tacoma International Airport in Seattle, Washington.

Your flight direction from DCA to SEA is Northwest (-60 degrees from North).

The distance calculator helps you figure out how far it is to fly from DCA to SEA. It does this by computing the straight line flying distance ("as the crow flies"). It uses the great circle formula to compute the total travel mileage.

Ronald Reagan Washington National Airport

IATA: DCA
ICAO: KDCA
FAA: DCA
City: Washington
State: District of Columbia
Zip code: 20001
Country: United States
Category: airports

Seattle-Tacoma International Airport

IATA: SEA
ICAO: KSEA
FAA: SEA
City: Seattle
State: Washington
Zip code: 98168
Country: United States
Category: airports

Flight distance calculator

Travelmath provides an online flight distance calculator to get the distance between cities. You can also compare all types of locations including airports, cities, states, countries, or zip codes to find the distance between any two points. The database uses the latitude and longitude of each location to calculate distance using the great circle distance formula. The calculation is done using the Vincenty algorithm and the WGS84 ellipsoid model of the Earth, which is the same one used by most GPS receivers. This gives you the flying distance "as the crow flies." Find your flight distances quickly to estimate the number of frequent flyer miles you'll accumulate. Or ask how far is it between cities to solve your homework problems. You can lookup U.S. cities, or expand your search to get the world distance for international trips.