What Time Does the London Forex Session Open?
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Direct answer
The London forex session opens at 07:00 GMT, which is 08:00 BST during British Summer Time and 08:00 CET during winter months. The London session runs from 07:00 to 16:00 GMT and accounts for roughly 38 per cent of global foreign exchange turnover according to the Bank for International Settlements, making London the single largest currency trading hub worldwide.
The London forex session opens at 07:00 GMT and closes at 16:00 GMT, giving a nine-hour window that defines the European trading day. During British Summer Time, which runs from late March to late October, the local clock in London reads 08:00 at the open. In winter the local clock also reads 08:00, but that is Central European Time on the continent, with London itself back on GMT. The KenMacro desk treats 07:00 GMT as the anchor regardless of seasonal clock changes.
London matters because it is the largest foreign exchange hub on the planet. Bank for International Settlements triennial survey data places London at roughly 38 per cent of global FX turnover, ahead of New York, Singapore, Hong Kong, and Tokyo combined on several measures. The desk treats this figure as the structural reason that London’s opening hour produces the cleanest liquidity transitions of any session worldwide. When London desks switch their books on, spreads tighten and order flow deepens within minutes.
Most active during the London session are EUR/USD, GBP/USD, and EUR/GBP. These three pairs see their tightest spreads and deepest order books during London hours because the major liquidity providers, the interbank market makers, and the corporate treasury flows are all live. Cross pairs involving the euro and sterling, alongside EUR/CHF and EUR/JPY, also become considerably more tradable. Exotic pairs involving Scandinavian currencies, the Polish zloty, and the South African rand wake up at the London open as well.
Liquidity peaks twice during the London window. The first peak arrives at the open itself, between 07:00 and 09:00 GMT, when European banks position for the day and overnight Asian flows are squared. The second peak, and the more important one for many institutional desks, arrives during the London to New York overlap from 12:00 to 16:00 GMT. This four-hour overlap is the deepest, most liquid stretch of the entire 24-hour trading day.
Volatility patterns during the London session follow a predictable rhythm. The first ninety minutes after the open often produce directional moves as European participants react to the Asian session’s closing prices and to the morning’s economic data releases. UK inflation, employment, and GDP prints typically land at 07:00 GMT, eurozone data tends to release between 08:00 and 10:00 GMT, and these prints can move sterling and euro pairs sharply within the first two hours.
Spread behaviour at the London open is notably better than spread behaviour at the Sydney or Tokyo opens. Major pairs such as EUR/USD typically print spreads of half a pip or less at most brokers once London is fully online. This matters for any trader running tight stops or scaling into positions, because execution costs at the London open are structurally lower than at any other time outside the New York overlap.
Economic data is the dominant catalyst during the London session. The European Central Bank rate decisions, the Bank of England rate decisions, eurozone CPI and PMI prints, UK CPI and employment data, and German IFO and ZEW surveys all release during London hours. The desk plans the trading day around the official UK and eurozone economic calendars rather than around generic session timings, because data drives the session more than the clock does.
The London close at 16:00 GMT is itself a notable event. The 16:00 GMT fix, more formally known as the WM/Reuters 4pm London fix, is the benchmark exchange rate used by index providers, pension funds, and corporate treasurers worldwide. Order flow around the fix can produce sharp, brief moves in major pairs as large benchmark orders execute. This is structural flow, not directional speculation, and it tends to reverse partially in the hour after the fix.
For traders based outside Europe, the London open translates as follows. New York sits at 02:00 or 03:00 EST depending on daylight saving alignment, Singapore and Hong Kong sit at 15:00 local, Sydney sits at 17:00 or 18:00 AEST, and Tokyo sits at 16:00 JST. The desk publishes session timings in GMT to avoid the four-times-a-year confusion that daylight saving transitions in the UK, the eurozone, North America, and Australia create.
Practical guidance from the KenMacro desk: treat the London open as the start of meaningful institutional flow rather than as a signal in itself. Spread compression, volume surge, and depth-of-book improvement at 07:00 GMT make the session attractive for execution, but the session’s profitability for any given strategy depends on the underlying setup, not on the clock. The full session-by-session breakdown sits on the KenMacro session guide at https://kenmacro.com/forex-sessions/.
Seasonal clock changes
The UK observes British Summer Time from the last Sunday in March to the last Sunday in October, shifting London local time from GMT to BST. The eurozone runs CEST during the same window. North America transitions on different dates, creating brief periods each spring and autumn where the London to New York overlap shifts by an hour. The desk anchors all session timings to GMT to avoid this seasonal drift.
Get the framework the desk runs every morning. Free. No card. The same institutional structure the MACRO MASTERY desk uses on every read.
The London to New York overlap
From 12:00 to 16:00 GMT, the London and New York sessions run concurrently. This four-hour window is the most liquid stretch of the entire trading day, with the deepest order books, the tightest spreads, and the largest share of daily volume. Most major economic surprises from both sides of the Atlantic land inside this window, and the desk treats this overlap as the structurally most tradable period for major pairs.
ASIC regulated. The desk’s preferred broker for retail macro traders who want the MACRO MASTERY desk overlay alongside the platform.
Friday close behaviour
London Fridays behave differently from other weekdays. Liquidity often thins from 14:00 GMT onwards as European desks square positions ahead of the weekend, and the 16:00 GMT fix on a Friday can produce outsized flow as weekly benchmark orders execute. The desk treats Friday afternoon London sessions with additional caution, particularly around month-end and quarter-end fix dates where benchmark rebalancing flow concentrates.
Compare regulated brokers on the desk
Related from the desk
ASIC regulated. Raw-spread ECN execution. Built for active intraday forex and index traders who care about cost per round-turn.
Frequently asked
What time does the London forex session open in GMT?
The London forex session opens at 07:00 GMT every weekday and closes at 16:00 GMT. This timing remains constant year-round when measured in GMT, although the local London clock shows 08:00 during British Summer Time between late March and late October each year.
What time does the London session open in New York time?
The London session opens at 02:00 EST during standard time and 03:00 EDT during daylight saving time. Because UK and US daylight saving transitions occur on different dates each spring and autumn, the offset shifts by an hour for roughly two weeks each year. Anchoring to GMT avoids this seasonal confusion.
Which currency pairs are most active during the London session?
EUR/USD, GBP/USD, and EUR/GBP are the three most active pairs during the London session. EUR/CHF, EUR/JPY, and crosses involving Scandinavian currencies and the Polish zloty also see significantly improved liquidity. Spreads on major pairs typically tighten to half a pip or less once London desks are fully online after the open.
When is the London and New York overlap?
The London to New York overlap runs from 12:00 to 16:00 GMT, lasting four hours each weekday. This window is the most liquid stretch of the entire 24-hour trading day, with the deepest order books, tightest spreads, and largest share of daily volume across major pairs such as EUR/USD and GBP/USD.
Why is London the biggest forex trading hub?
London accounts for roughly 38 per cent of global foreign exchange turnover according to Bank for International Settlements triennial survey data. The concentration reflects historical depth, time-zone overlap with both Asia and North America, English-language convention, and the clustering of major bank trading floors and electronic liquidity providers in the City of London and Canary Wharf.
Does the London session open at the same time in winter and summer?
In GMT terms, yes, the London session opens at 07:00 GMT year-round. The local London clock reads 07:00 in winter and 08:00 in summer due to British Summer Time, but the GMT anchor remains constant. The desk publishes all session timings in GMT to eliminate seasonal ambiguity for international traders.
What economic data releases during the London session?
UK inflation, employment, GDP, and retail sales typically release at 07:00 GMT. Eurozone PMI, CPI, and ZEW or IFO surveys release between 08:00 and 10:00 GMT. Bank of England and European Central Bank rate decisions also land inside London hours, making the session the most data-heavy stretch of the European trading day.
Educational analysis only. Past performance does not guarantee future results. Manage risk against your own portfolio.
Continue reading