• Dulles and Seattle midpoint

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Halfway between IAD and SEA

The best city between IAD and SEA to meet is Valley City, North Dakota which is about 12 miles from the exact midpoint.

The town that marks the exact halfway point is actually Koldok, North Dakota.

The closest zip code to the midpoint is 58063.

The exact latitude and longitude coordinates are 46° 55' 12" N and 97° 45' 6" W.

The closest major city that is roughly halfway is Winnipeg, Canada.

The total driving distance from IAD to SEA is 2,748 miles or 4 422 kilometers.

Each person would then have to drive about 1,374 miles to meet in the middle.

It will take about 20 hours and 58 minutes for each driver to arrive at the meeting point.

Since this is a long drive, you might want to split up your road trip into multiple days. You can search for the best stopping points from IAD to SEA to plan out your trip.

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For a flight, the straight line geographic midpoint coordinates are 45° 26' 28" N and 98° 13' 45" W.

The city at the geographic halfway point from IAD to SEA is James, South Dakota.

Halfway point calculator

Travelmath helps you figure out the midpoint between two locations based on the driving directions from each starting point. You can find the closest town that is an equal distance from two cities. Use this tool to determine the best city to meet, or to look for interesting stops along the way if you're planning a long road trip and you need to take a break or stay overnight. Search for hotels at the midpoint city to split up your drive, or explore other nearby cities and discover local towns on your trip. If you're meeting a friend halfway in-between, you can figure out how far each person has to drive and how long it will take to arrive at the center. Even if you're separated by water, you can still calculate the straight line geographic midpoint to determine the closest flight distance.