Route guide

Chicago London

O'Hare International (ORD) — Heathrow (LHR)

Eastbound

Distance: 6,360 km
Duration: 7.5h
TZ shift: 6h east
Best side: right

Overview

Chicago O'Hare to London Heathrow — one of the main midwest-UK trunks. Overnight east; sleep on the plane and aircraft type are the two controllables that matter.

Jet lag

6-hour eastward shift, overnight. Sleep aligned to London night; morning light on arrival; expect a slightly rougher first day than a 5-hour shift but functional by day 2.

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 ORD→LHR adaptation schedule

Best window side

Eastbound overnight — the right side faces north and catches sunrise nearing Europe. Window over view if you're trying to sleep.

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

BA's A350-1000 and United's 787-9 are noticeably easier on the cabin than 777-300ER on this sector. Filter by aircraft if you can.

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.

Read before you fly

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