Distance From Castle Airport to Seattle–Tacoma International Airport, MER - SEA Distance

The distance from Castle Airport (MER) to Seattle–Tacoma International Airport (SEA) is 702 miles or 1129 kilometers or 609 nautical miles.

The distance shown below is direct flight distance between airports. Straight-line distance does not account for the surface between the two points. It is the distance a bird or airplane would travel between the two points when flying above the surface. The straight line distance is the direct route between two points, regardless of whether or not there are roads that connect them.

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How long does it take to travel from Merced ( United States ) to Seattle ( United States )?

A one-way nonstop (direct) flight between Merced and Seattle takes around 1 hours 36 minutes.

Estimated flight time from Castle Airport, Merced, United States to Seattle–Tacoma International Airport, Seattle, United States is 1 hours 36 minutes under avarage conditions. Your actual flying time may vary depending on wind direction/speed or weather conditions. This calculation does not include the departure and landing times of the aircraft. In addition, it does not cover the person identity check, ticket check-in and baggage collection times at the airport.

Travel Distance Between the Airports • MER - SEA

Kilometers		1129 km
Statute Miles		702 miles
Nautical Miles		609 nm
Avg. Time of Flight		1 hours 36 minutes

Castle Airport to Seattle–Tacoma International Airport Flight Route Map - MER to SEA Flight Path

Location of Castle Airport & Seattle–Tacoma International Airport is given below.
Click the map to view Merced to Seattle nonstop flight path and travel direction.

Click to see flight route on Google Map between Merced, United States and Seattle, United States. .

Nonstop flight route between Merced, United States and Seattle, United States.

Time Difference Between the Airports • MER - SEA

Time difference between Merced (United States) and Seattle (United States) is 1 Hours.
Seattle time is 1 Hours ahead of Merced.

Location	Local Time
Merced (United States)	2026-03-20, 20:39:13 PDT
Seattle (United States)	2026-03-20, 21:39:13 MDT

Why should you arrive 3 hours before international flight? Flyers who are traveling to an international destination should arrive at the airport earlier than domestic flyers. This is because international flights can have additional check-in requirements, like passport verification, that need to be completed before you receive your boarding pass.

Origin

Castle Airport (MER / KMER) Merced, United States

Destination

Seattle–Tacoma International Airport (SEA / KSEA) Seattle, United States