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Route guide

San Francisco Hong Kong

San Francisco International (SFO) — Hong Kong International (HKG)

Westbound
Distance
11,140 km
Duration
14h
TZ shift
15h west
Best side
right

Overview

San Francisco to Hong Kong — one of the main US-Asia corridors, usually flown by composite aircraft. Westbound dateline crossing makes the jet-lag math friendlier than the raw TZ math.

Jet lag

Crosses the dateline — calendar shifts a day forward, but the body experiences this as roughly a 9-hour westward delay. Stay up into the local evening on arrival, get afternoon light, and the body catches up faster than the clock suggests.

Estimated recovery

Without intervention ~10 days
With timed light + melatonin ~6 days

Estimates only — based on ~1 day per time zone west, compressed roughly 40% with a timed protocol. See how long jet lag actually lasts .

Build a SFO→HKG adaptation schedule

Best window side

Westbound across the Pacific — the right (north) side is the shadier choice through the long daylit cruise.

Typical economy row (3-3-3)

Left

Middle

Best · Right

The right window is the calmer pick on this route. For sleep, the window itself matters more than the side — see how to sleep on a long-haul. For the exact rows and seat letters on this aircraft, use the seat picker.

Cabin atmosphere

Cathay's A350-1000 is the comfort pick on this sector. United's 787-9 is the next-best. A 777-300ER is workable but drier for 14 hours.

Expected cabin humidity at cruise

This route's typical aircraft ~15-20%
Indoor air at home ~40-60%

Composite-fuselage aircraft (787, A350) run higher humidity than older aluminum-fuselage types. See what the 787 actually fixes.

What to pack for this route

Read before you fly

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