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Flight Patterns

Aircraft primarily take-off and land facing into the prevailing winds. Sea-Tac operates in a south-flow or north-flow condition, depending upon the direction of the prevailing winds.

Winds from the south

When the winds are from the south, aircraft will depart the airport in a southerly direction and arriving aircraft will approach from the north. This operation occurs most commonly during the cooler, cloudier months of the year. The airport is in south-flow operations approximately 65% of the year.

South Flow

Winds from the north 

When winds are from the north, aircraft will depart the airport in a northerly direction and arriving aircraft will approach from the south. This operation occurs most commonly during the warmer, sunnier periods of the year.

North Flow

 

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