Orb Vector

Frequently Asked Questions

What is the exact flight distance from SFO to BOS?

The Great Circle flight distance between San Francisco International Airport (SFO) and General Edward Lawrence Logan International Airport (BOS) is approximately 4,341 km (2,344 nautical miles / 2,697 statute miles).

How long does a flight take between SFO and BOS?

Estimated flight duration is approximately 4h 41m based on typical commercial cruise speeds (~900 km/h) and prevailing jet stream winds, including standard 30-minute takeoff and approach buffers.

What is the initial departure heading toward BOS?

Departing from San Francisco International Airport (SFO), the initial true forward bearing toward BOS is 66° ENE. Because Great Circle routes cross lines of longitude at varying angles, the compass heading changes continuously along the flight path.

How much distance does flying the Great Circle save compared to a Rhumb line?

The constant compass heading (Rhumb line) covers 4,405 km. Following the Great Circle route saves distance and flight time, with a path divergence of +64 km (+1.5%).

Which window seat side is best when flying from SFO to BOS?

For scenic views and horizon lighting, choose Port (Left — Seat A) (faces the higher-latitude horizon arc with minimal atmospheric haze and twilight gradients.). For minimal solar glare and a cooler cabin environment, choose Port (Left — Seat A).

What countries and oceans does the flight from SFO to BOS fly over?

The Great Circle trajectory from San Francisco (SFO) to Boston (BOS) follows a Mid-Latitude Temperate Geodesic peaking at 43.5°N, crossing the North Atlantic Ocean and traversing airspace associated with United States, Canada.

What is a Great Circle?

A Great Circle is the intersection of a sphere and a plane that passes through the sphere's center. It represents the largest possible circle that can be drawn on a sphere and defines the shortest path between two points on the surface.

Why do flight paths look curved on 2D maps?

Most 2D maps use the Mercator projection, which distorts size and shape as you move away from the equator. A straight line on a Mercator map (a rhumb line) is actually a longer path than the curved Great Circle route. Pilots fly the Great Circle route to save fuel and time.

How accurate are the distances?

Orb Vector calculates distances using the Haversine formula, which accounts for the Earth's curvature. While the Earth is not a perfect sphere (it's an oblate spheroid), the error margin is negligible for general flight planning and visualization purposes, typically within 0.5%.

Can I measure multi-stop routes?

Yes! You can chain multiple airports together to create a complex itinerary. The tool will calculate the distance for each leg of the journey as well as the total cumulative distance.

How is flight time estimated?

Our flight time estimator uses a standard cruising speed of 900 km/h (approx 485 knots) and adds a 30-minute buffer for takeoff and landing per leg. Crucially, it also accounts for the Jet Stream: eastbound flights are calculated as ~15% faster due to tailwinds, while westbound flights are slower due to headwinds.

What are the "Discover Routes"?

We've curated a selection of extreme and interesting aviation routes, such as the world's longest flight (Singapore to JFK) and the "Island Hopper" across the Pacific. Use the "Discover Routes" menu to instantly visualize these famous trajectories.