Orb Vector

Frequently Asked Questions

What is the exact flight distance from SIN to SFO?

The Great Circle flight distance between Singapore Changi International Airport (SIN) and San Francisco International Airport (SFO) is approximately 13,582 km (7,334 nautical miles / 8,439 statute miles).

How long does a flight take between SIN and SFO?

Estimated flight duration is approximately 13h 59m 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 SFO?

Departing from Singapore Changi International Airport (SIN), the initial true forward bearing toward SFO is 43° NE. 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 14,292 km. Following the Great Circle route saves distance and flight time, with a path divergence of +710 km (+5.2%).

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

For scenic views and horizon lighting, choose Port (Left — Seat A) (directly faces the sunset horizon crossing approximately 4h 40m into the flight.). For minimal solar glare and a cooler cabin environment, choose Port (Left — Seat A).

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

The Great Circle trajectory from Singapore (SIN) to San Francisco (SFO) follows a Mid-Latitude Temperate Geodesic peaking at 47.4°N, crossing the South China Sea, North Pacific Ocean, East China Sea and traversing airspace associated with Singapore, United States.

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.