Seattle, United States → Boston, United States · ✈ 5h 30min
2,160 nautical miles · Time difference: +3h ahead · Direction: southeast
The distance from Seattle to Boston 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 Seattle, United States to Boston, 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.
Boston is located southeast of Seattle. Seattle is in North America, in the Pacific Northwest region of United States, while Boston is in North America, in Northeast, 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 Seattle to Boston. For 4,000 km, flying saves significant time and is usually the most practical choice.
Seattle sits at 47.6062°N, 122.3321°W, while Boston is located at 42.3601°N, 71.0589°W. The initial compass bearing from Seattle to Boston is 79° (E), so a great-circle flight path leaves Seattle heading roughly E. 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 Seattle and Boston 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.
Boston is roughly 3 hours ahead of Seattle. When it is 09:00 in Seattle, it is approximately 12:00 in Boston. 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.
Seattle is a major city in United States with a population of approximately 737,015. Located in the Pacific Northwest region, it is an important hub in North America. Despite its smaller size, Seattle plays an important regional role in United States and attracts visitors year-round.
→ See all distances from Seattle
Boston is a notable city in United States with a population of approximately 675,647. Situated in the Northeast region, it serves as a key destination in North America. Boston is a popular destination in the Northeast region of United States, known for its unique character and attractions.
→ See all distances from Boston
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 Seattle and Boston 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, Seattle and Boston 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 Seattle to Boston 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.
Boston is approximately +3h ahead compared to Seattle.
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.