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Jet Lag London to Delhi (LHR–DEL): Timeline & Recovery Plan

Eastbound protocol · LHR → DEL · 4.5 to 5.5 time zones · Last updated & sources reviewed: August 2026

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London and Delhi travel route skyline
Image source: Unsplash (free-to-use license).

Delhi runs 5.5 hours ahead of London in the British winter and 4.5 ahead in summer — a difference that is genuinely not a whole number, because India uses a half-hour offset. Eastward adjustment runs at roughly an hour a day, so expect around 6 days for full realignment and 3–4 to feel functional. Moderate on paper, and harder than that if you land at dawn.

A note on seasonal variation: India sits at UTC+5:30 and does not observe daylight saving. The UK does. The gap swings between 4.5 and 5.5 hours across the year, and the half-hour component means arithmetic that "feels" right is often thirty minutes out. Flight timings on this page are approximate estimates — verify against your booking. Operational planning in this guide follows three primary evidence anchors: recovery speed is usually approximately one circadian hour per day eastward and somewhat faster westward (Waterhouse et al., 2007); light timing effects follow the human phase response curve, so morning and evening exposure can shift the clock in opposite directions (Khalsa et al., 2003); and melatonin evidence is strongest for correctly timed short-term use after eastbound travel (Herxheimer & Petrie, 2002). For practical timing details, see our melatonin guide. If you use melatonin, check timing and interactions with a pharmacist or doctor.

Why This Route Feels the Way It Does

The half hour is not a rounding error. India's UTC+5:30 offset is one of a handful worldwide that isn't a whole number of hours. It rarely changes a recovery plan, but it does mean that mental arithmetic about meeting times, medication schedules and connecting flights goes wrong in a specific and repeatable way. Set your phone rather than calculating.

Direction works against you. Eastward travel requires advancing the body clock — sleeping and waking earlier than it wants — which human circadian biology resists. Five and a half hours eastward costs meaningfully more than the same shift westward.

The arrival hour matters more than the gap does. Many long-haul services into Delhi land in the early hours or around dawn, which lands you in a large, busy terminal at a point when your body is at its lowest. If your booking arrives at 03:00 local, plan the onward journey and the first sleep before you fly, not on the pavement outside Terminal 3.

Recovery Timeline

DayWhat's happeningWhat to do
Day of travelDepends heavily on arrival hour — check yoursSet Delhi time at the gate
Day 1 in DelhiPeak fatigue; trouble settling at a local bedtimeOutdoor morning light; naps capped at 20–30 minutes
Days 2–4Sleep onset improving, afternoons unevenLocal meal times; steady bedtime
Days 5–6Near-full alignment for most travelersNormal routine

Individual recovery varies with age and chronotype; morning types tend to handle eastward shifts better.

Before You Fly

A 5.5-hour eastward shift rewards modest preparation:

  • Move sleep 30–45 minutes earlier for two or three nights before departure.
  • Seek morning light in the run-up.
  • Check your arrival time and plan around it. This is the single most useful preparation on this route — a dawn landing and an afternoon landing call for completely different first days.

In Flight

  • Set your phone to Delhi time at the gate — with the half-hour offset, this matters more than usual.
  • Plan sleep against your actual arrival hour. On a service landing at dawn, sleeping the second half of the flight is worth prioritising. On an afternoon arrival, the calculation reverses.
  • Skip alcohol.
  • Hydrate. The dry cabin plus Delhi's climate is a combination worth getting ahead of.

On Arrival

  • Get outdoor morning light. For an eastward advance this is the strongest lever available.
  • If you land before dawn, don't go straight to bed for eight hours. A short sleep to take the edge off, then out into the morning light, beats sleeping through the one window that would help you.
  • Cap naps at 20–30 minutes.
  • Eat at Delhi times from the first meal.
  • Use the Airport Express Metro if you can. It reaches New Delhi Railway Station in around 20 minutes for a modest fare, against 35–50 minutes by car off-peak and up to 80–90 in rush hour. In a city where traffic is the dominant variable, that predictability is worth a lot when you're depleted.

Know Your Airports: LHR and DEL

Departing from Heathrow Airport (LHR)

  • Two-bag limit at the security checkpoint — a cabin bag plus one personal item. Anything more gets checked.
  • Liquids up to 2 litres are permitted following the CT scanner rollout, and you don't need to remove liquids or electronics from your bag. Note that this does not transfer: India applies the 100ml rule, so pack accordingly for the return.
  • Terminals are numbered 2 to 5 with no Terminal 1, and rail connections differ — Heathrow Express serves a station between Terminals 2 and 3, while 4 and 5 have their own.
  • One lighter per person, carried on your person.

Arriving at Indira Gandhi International Airport (DEL)

All international flights use Terminal 3, a building of over five million square feet handling international traffic plus full-service domestic carriers. Terminals are not connected airside — if you're connecting to a domestic flight from T1 or T2, you'll need the free inter-terminal shuttle, which runs roughly every 20 minutes and takes 15–20.

  • Submit the e-Arrival Card online within 72 hours before landing. It's mandatory for international arrivals and much easier done in advance than in a queue.
  • Allow a real buffer for domestic connections. Four to six hours is the safe planning range on separate tickets, especially in peak season — immigration, baggage reclaim and a terminal change add up fast.
  • The Airport Express Metro connects T3 to New Delhi Railway Station in about 20 minutes. It is consistently the fastest way into the city.
  • T3 has nap pods and a transit hotel inside the terminal, genuinely useful if you land at 03:00 with nowhere to go until morning.
  • DigiYatra, the facial recognition entry system, is voluntary but cuts entry time substantially for enrolled passengers.

A Few Fun Facts to Pass the Time in Line

At LHR:

  • Heathrow opened in 1930 as a single grass runway, and was called London Airport until 1966.
  • Terminal 3, not Terminal 1, was the first of the current terminals to open, in 1961.
  • A never-used railway platform sits beneath Terminal 5, built for a rail link that never happened.
  • Two unmarked VIP suites operate somewhere in the airport — the Royal Suite and the Windsor Suite — with locations not made public.

At DEL:

  • Delhi is India's busiest airport and among the ten busiest in Asia, handling passenger numbers in the tens of millions annually.
  • Terminal 3 spans over 5.4 million square feet across multiple levels — large enough that the walk from entry gate to your gate can add ten minutes if you enter at the wrong one.
  • The airport is closer to the city centre than most mega-hubs of its size, roughly 16 km from Connaught Place.
  • Terminal 3 has eight separate entry gates; using the one matching your airline saves a meaningful walk.

What to Buy

For the flight itself

Around nine hours warrants compression socks, an eye mask and a refillable bottle. Note the one-bag cabin rule below before you plan what to carry.

For your first days in Delhi

A local SIM or eSIM, sorted at the airport. Sunglasses. If you're arriving before dawn, having your onward transport and first accommodation confirmed in advance is worth more than any gadget.

Souvenirs and local specialties

From London, before you fly:

  • Tea, though bringing tea to India has an obvious comic dimension — British breakfast blends are genuinely different from Indian ones and travel well as gifts.
  • British chocolate, which doesn't survive the Delhi climate unless you're quick.
  • Museum shop items from the British Museum or V&A.

From Delhi, before you fly home:

  • Whole spices from a proper market rather than the airport — the difference in quality is substantial and they pack flat.
  • Block-printed textiles, light and genuinely local.
  • Tea from Darjeeling or Assam, bought at source rather than repackaged abroad.
  • Note the UK's rules on bringing in food products from outside the EU before buying anything perishable.

What You Can't Pack

Flying out of LHR (UK rules)

  • Liquids up to 2 litres permitted, with no need to remove liquids or electronics from your bag.
  • The allowance does not transfer. India applies a strict 100ml rule, so anything you clear at Heathrow may be confiscated on the return leg. Pack to 100ml if you're bringing toiletries both ways.
  • Two-bag limit at the checkpoint.
  • One lighter per person, on your person.

Flying out of DEL (Indian rules — BCAS/CISF)

India's cabin baggage rules are stricter than many travelers expect:

  • One cabin bag only. Under current BCAS policy you may carry a single piece of cabin baggage — not a backpack and a trolley. A handbag must go inside it. This applies on international as well as domestic departures and is enforced.
  • Size and weight: typically 55 x 40 x 20 cm and 7 kg in economy, 10 kg in business.
  • Liquids: 100ml per container in a single 1-litre transparent resealable bag. The container size governs, not how full it is — a part-used 200ml bottle is confiscated.
  • Power banks and spare lithium batteries in cabin only, never checked. Up to 100Wh (roughly 27,000mAh) without restriction; 100–160Wh needs airline approval; above 160Wh prohibited. They cannot go in overhead bins.
  • Sharp objects: knives of any length and scissors with blades over 6 cm are banned from the cabin.
  • Lighters and e-cigarettes must stay in cabin baggage and are prohibited in the hold.
  • Alcohol between 24% and 70% ABV may be checked in unopened retail packaging, limited to 5 litres. Above 70% is banned from both.
  • Digital customs declaration via ICEGATE applies to international passengers as of February 2026.

Confirm with your airline and the relevant national authority before departure — India's cabin baggage enforcement has tightened and rules are being updated.

Frequently Asked Questions

How long does jet lag from London to Delhi actually last? Around 6 days for full realignment, 3–4 to feel functional, following the rule of roughly one day per time zone crossed eastward. The gap itself is 5.5 hours in the British winter and 4.5 in summer.

Why is the time difference not a whole number? India uses a single national time zone at UTC+5:30 — a half-hour offset, which a handful of countries use. It doesn't change the recovery plan much, but it does mean mental arithmetic about meeting times goes wrong by thirty minutes with some regularity.

Can I carry a backpack and a suitcase into the cabin at Delhi? No. India enforces a one-cabin-bag rule: a single piece, with any handbag packed inside it. This surprises a lot of travelers at Delhi security and is not negotiable at the checkpoint.

I'm landing at 3am — should I just sleep until noon? Better not. A short sleep to take the edge off, then out into the morning light, does more for a 5.5-hour eastward shift than sleeping through the one window that would help. Book a nap pod or the transit hotel at T3 if you need somewhere to do it.

Key Takeaways

  • The gap is 5.5 hours in the British winter and 4.5 in summer, and India's half-hour offset means it is never a whole number.
  • Baseline recovery is about 6 days eastward, compressible to 3–4 with morning light and steady sleep timing.
  • Your arrival hour shapes the first day more than the gap does — check it and plan around it.
  • India enforces a strict one-cabin-bag rule and the 100ml liquid limit; Heathrow's 2-litre allowance does not travel with you.

This article reflects general circadian rhythm research and is not medical advice. Individual recovery time varies. This page contains affiliate links; we may earn a commission at no extra cost to you.

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