Route guide

Los Angeles Sydney

Los Angeles International (LAX) — Kingsford Smith (SYD)

Westbound

Distance: 12,060 km
Duration: 15h
TZ shift: 19h west
Best side: right

Overview

LAX to Sydney — one of the longest scheduled commercial routes. Crossing the international dateline confuses the math: the calendar moves forward but the body experiences a westward delay.

Jet lag

Crosses the dateline — calendar shifts a day forward but circadian effect is roughly 5 hours westward. Easier than the raw timezone difference suggests.

Estimated recovery

Without intervention ~13 days

With timed light + melatonin ~8 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 LAX→SYD adaptation schedule

Best window side

Outbound westbound across Pacific — right side faces north and gets sunset light through 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

A380 lower deck has the most stable cabin humidity. 787 is best on smaller aircraft for hydration on a 15-hour flight.

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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