Skip to content

Route guide

London Bangkok

Heathrow (LHR) — Suvarnabhumi (BKK)

Eastbound
Distance
9,540 km
Duration
11.5h
TZ shift
6h east
Best side
right

Overview

London Heathrow to Bangkok — a long leisure corridor flown mostly overnight from London. The eastbound jet lag is moderate but real; aircraft choice meaningfully affects how you arrive.

Jet lag

6-hour eastward shift on an overnight from London. Use the flight for as much sleep as possible aligned to Bangkok night; get bright morning light on arrival; expect 3-4 days to feel fully aligned.

Estimated recovery

Without intervention ~6 days
With timed light + melatonin ~4 days

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

Build a LHR→BKK adaptation schedule

Best window side

Eastbound — for sleep, choose the window for shade control. The view side varies by routing (north over Europe and Central Asia), but glare management is the higher priority.

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

Thai's A350 and BA's 787-9 are noticeably easier on the cabin atmosphere than 777-300ER on an 11+ hour leg. Worth checking the aircraft on the day of booking.

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

Picked for LHR → BKK

All articles →

Other routes

Related to LHR → BKK

All routes →