Boston, United States → Seattle, United States · ✈ 5h 30min
2,160 nautical miles · Time difference: -3h behind · Direction: northwest
The distance from Boston to Seattle is 4,000 km (2,485 miles). The fastest way to travel is by flight. A direct flight takes approximately 5h 30min.
The straight-line distance from Boston, United States to Seattle, United States is approximately 4,000 kilometers (2,485 miles or 2,160 nautical miles). This measurement uses the Haversine formula, computing the great-circle distance — the shortest path between two points on Earth's surface.
Seattle is located northwest of Boston. Boston is in North America, in the Northeast region of United States, while Seattle is in North America, in Pacific Northwest, United States. Both cities are in North America.
| Mode | Distance | Est. Time | Best For |
|---|---|---|---|
| ✈️ Flight | 4,000 km | ~5h 30min | Best option for speed |
Our recommendation: flight is typically the best way to travel from Boston to Seattle. For 4,000 km, flying saves significant time and is usually the most practical choice.
Boston sits at 42.3601°N, 71.0589°W, while Seattle is located at 47.6062°N, 122.3321°W. The initial compass bearing from Boston to Seattle is 296° (WNW), so a great-circle flight path leaves Boston heading roughly WNW. Because the Earth is curved, the actual heading shifts gradually along the route — pilots and navigation systems update it continuously instead of holding a single fixed compass bearing.
The latitude difference is 5.25° and the longitude difference is 51.27°. Each degree of latitude represents about 111 km, which is one reason cross-latitude routes feel longer even when the map looks similar to east–west journeys.
The geographic midpoint between Boston and Seattle is approximately 47.9399°N, 95.4367°W. This is the great-circle halfway position — the spot where you would be exactly 2,000 km from each city. On long-haul flights this point usually falls over open ocean or remote terrain, which is why in-flight maps often look "empty" mid-route.
Seattle is roughly 3 hours behind Boston. When it is 09:00 in Boston, it is approximately 06:00 in Seattle. A 3-hour shift is small enough that most travelers adjust within a day. Daylight saving time can shift the offset by an hour during certain months, so confirm the exact difference for your specific travel dates.
Boston is a major city in United States with a population of approximately 675,647. Located in the Northeast region, it is an important hub in North America. Despite its smaller size, Boston plays an important regional role in United States and attracts visitors year-round.
→ See all distances from Boston
Seattle is a notable city in United States with a population of approximately 737,015. Situated in the Pacific Northwest region, it serves as a key destination in North America. Seattle is a popular destination in the Pacific Northwest region of United States, known for its unique character and attractions.
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4,000 km is a long-distance route that typically requires air travel. This is comparable to spanning a large continent. For context, London to Dubai is about 5,500 km.
The 4,000 km between Boston and Seattle means a beam of light could travel this distance in approximately 13.3 milliseconds — but a flight still takes 5h 30min.
Despite both being in United States, Boston and Seattle are 4,000 km apart — a reminder of how vast the country is. Flying is the only practical option, and the journey likely involves crossing multiple climate zones and time zones.
The straight-line distance from Boston to Seattle is approximately 4,000 kilometers (2,485 miles, 2,160 nautical miles).
A direct flight takes approximately 5h 30min, based on 800 km/h cruising speed plus 30 minutes for takeoff and landing.
Estimated driving time is approximately 65h, based on 80 km/h average speed and roads being ~30% longer than straight-line distance.
Seattle is approximately -3h behind compared to Boston.
The estimated road distance is approximately 5,200 km, which is about 30% longer than the 4,000 km straight-line distance.
📍 Data: Coordinates from OpenStreetMap contributors. Distances calculated using the Haversine formula. Travel times are estimates only. Last verified: August 5, 2026.