London session in forex trading explained
By Ken Chigbo, Founder, KenMacro. Published 2026-05-13.
Quick answer
The London session is the European trading window when the City of London and connected financial centres are open. It runs roughly from 8am to 5pm UK time and consistently produces the highest FX turnover, the tightest spreads on major pairs, and the widest intraday ranges of any session.
What is London session?
The London session refers to the hours when London-based interbank dealers, market makers, and institutional desks are active in the foreign exchange market. It typically opens around 8am UK time and closes around 5pm UK time, overlapping with the tail of the Asian session in the morning and with the New York open from roughly 1pm UK time. According to BIS triennial surveys, London accounts for the largest share of global FX turnover by a wide margin, which is why the session sets the tone for daily price action across majors, crosses, and many emerging market currencies.
How traders use London session
Retail traders gravitate to the London session because spreads on majors such as EUR/USD, GBP/USD, and EUR/GBP tighten meaningfully once European liquidity providers come online. The desk observes that genuine intraday trends tend to form between the 8am London open and the New York overlap, with stop runs and false breaks clustering around the open itself. Institutional desks use the window to execute large client orders, fix-related flows into the 4pm London fix, and rebalancing trades for funds and corporates. Practical implications: price discovery improves, slippage narrows on liquid pairs, and economic releases out of the UK, eurozone, and Switzerland get their primary reaction during this window. Many systematic strategies are tuned specifically to London hours because of this structural liquidity edge.
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Common misconceptions about the London session
A frequent mistake is treating the 8am UK open as a single mechanical breakout opportunity. The desk sees retail material claiming a guaranteed directional move, but the open often produces a stop run before the real session trend establishes. Another misconception is that the London session ends cleanly at 5pm. In practice, liquidity begins fading after the 4pm fix as European dealers close books, leaving the final hour thinner. A third error is assuming all pairs benefit equally. EUR-crosses and GBP-crosses see the largest liquidity uplift, while exotic pairs may still trade poorly even during London hours.
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Frequently asked
What time does the London session open and close?
The London session conventionally opens at 8am UK time and closes at 5pm UK time. During British Summer Time this corresponds to 7am to 4pm UTC, and during standard time it runs 8am to 5pm UTC. Some institutional desks reference an earlier 7am UK start when continental European dealers in Frankfurt and Paris begin trading. The most active liquidity tends to cluster between the 8am open and the 4pm London fix.
Why is the London session the most liquid FX window?
London handles the largest share of global FX turnover according to the Bank for International Settlements triennial survey. The city hosts the main dealing rooms of the largest banks, hedge funds, and prime brokers, and its time zone bridges Asian and American hours. This combination of dealer concentration and overlap with other sessions means more counterparties are quoting prices simultaneously, which compresses spreads and deepens order books on major pairs.
Which pairs trade best during the London session?
Pairs involving the euro, pound, and Swiss franc see the most pronounced liquidity improvement, including EUR/USD, GBP/USD, EUR/GBP, EUR/CHF, and EUR/JPY. Commodity currencies such as AUD/USD and NZD/USD trade adequately but show their peak liquidity earlier during the Asian session. USD/JPY tends to pick up most during the London to New York overlap rather than the pure London window.
What is the London to New York overlap?
The overlap is the window when both London and New York dealing rooms are simultaneously open, running from roughly 1pm to 5pm UK time, or 8am to noon New York time. This is the single most liquid period in the FX day. Combined order flow from European and American institutions produces the tightest spreads, largest ranges, and most decisive reactions to US economic data releases such as nonfarm payrolls and CPI.
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