Forex Trading Sessions: Hours, Overlaps, and Liquidity
Educational content. This article describes when forex liquidity concentrates across the trading day and the mechanics that connect session timing to execution conditions. It does not constitute investment advice, a recommendation, or an offer to buy or sell any financial instrument. CFD trading carries significant risk of loss and may not be suitable for all investors. Past patterns do not guarantee future results.
The forex market never closes during the trading week, but it is not equally active at all hours. Activity flows around the globe through four regional sessions, and where the day sits in that cycle determines how deep liquidity is, how tight spreads are, and how likely a position is to fill at the expected price. Understanding the session clock is one of the most practical things a new currency trader can learn.
This guide sets out the four sessions and their hours, explains the overlaps and why the London/New York window matters most, shows which pairs are most active when, and covers the two timing details that catch traders out: daylight saving shifts and the weekend gap. For the broader foundations, see the how to trade forex pillar guide.
What Are the Forex Trading Sessions?
The forex trading sessions are four regional windows, Sydney, Tokyo, London, and New York, that together keep the market open 24 hours a day, five days a week, as the trading day moves westward around the globe.
There is no central exchange in forex; instead, trading passes from one financial centre to the next. Sydney opens the week on Sunday evening (GMT), Tokyo follows for the Asian session, London takes over as Europe wakes, and New York carries the day into the US afternoon before activity thins ahead of the next Sydney open. Each handover changes the mix of participants, and with it the liquidity and the typical spread.
The Four Sessions and Their Hours (GMT)
The four forex sessions run on overlapping schedules, summarised below in approximate GMT, with the London/New York overlap as the busiest window of the day.
| Session | Approx. hours (GMT) | Liquidity | Notes |
|---|---|---|---|
| Sydney | 21:00 - 06:00 | Lower | Opens the trading week; thinner order books |
| Tokyo (Asian) | 23:00 - 08:00 | Moderate | JPY, AUD, and NZD activity centred here |
| London (European) | 07:00 - 16:00 | Highest single session | Largest forex centre; liquidity steps up at the open |
| New York (US) | 12:00 - 21:00 | High | US data releases; high volume |
| London/NY overlap | 12:00 - 16:00 | Highest of the day | Both major sessions open; tightest spreads |
These are approximate GMT hours. They shift by about an hour at daylight-saving transitions, as explained below; the session structure and overlap concept do not change.
The pattern to take from the table is that liquidity is not flat across the day. It builds as London opens, peaks when New York joins London, and recedes through the Asian session. That rise and fall is what drives the spread you pay and the risk of slippage you carry.
Sydney Session
The Sydney session opens the trading week on Sunday evening (GMT) and is characterised by lower liquidity and thinner order books than the later sessions.
It sets the early tone after the weekend and is the first place a weekend gap shows up (covered below). Ranges are often narrower outside of regional news, and spreads tend to sit wider than they will once London opens. Australian and New Zealand data can stir activity in the Antipodean pairs during these hours.
Tokyo (Asian) Session
The Tokyo session is the heart of Asian trading and is the most active window for yen and Antipodean pairs, with moderate overall liquidity.
Volatility often picks up around the Tokyo open as Japanese banks enter the market and around Japanese and Chinese data. This is the session where USD/JPY, AUD/USD, and NZD/USD see a meaningful share of their daily activity. The dollar-and-euro majors are quieter here, and their spreads tend to be at their widest of the day during the late Asian hours before London opens.
London (European) Session
The London session is the single most active of the four, because London is the largest forex centre in the world and handles the biggest share of global currency turnover.
Liquidity steps up sharply at the London open, spreads on the majors tighten, and the European data calendar (eurozone and UK releases) lands during these hours. EUR/USD and GBP/USD are at their most liquid once London is open, which is why both pairs are often studied around the European morning.
New York (US) Session
The New York session brings the deepest US liquidity and the bulk of high-impact US data, and for several hours it runs at the same time as London.
Most major US releases, Non-Farm Payrolls, CPI, and FOMC decisions among them, are published during the New York morning, which often concentrates the day's largest moves into the early part of this session. When New York closes in the evening (GMT), liquidity falls away until Sydney reopens.
The Session Overlaps
The session overlaps are the windows when two regional sessions are open at once, and they are the most liquid and active periods of the trading day.
London/New York Overlap
The London/New York overlap, roughly 12:00 to 16:00 GMT, is the highest-liquidity window in forex, when the two largest sessions trade simultaneously.
During these hours the order book is deepest, spreads on the majors are typically at their tightest, and most high-impact US data is released. For the dollar-and-euro majors, this is the busiest part of the day. The same depth that tightens spreads also means news can move price quickly, so while execution conditions are at their best, volatility can be at its highest too.
Tokyo/London and Sydney/Tokyo Overlaps
The Tokyo/London overlap is brief (around 07:00 to 08:00 GMT) and the Sydney/Tokyo overlap spans the Asian night, both with less depth than the London/New York window.
The short Tokyo/London handover can be quiet but is occasionally prone to sharp moves as European desks react to overnight Asian developments. The Sydney/Tokyo overlap matters mainly for the Antipodean and yen pairs that trade actively through Asian hours.
Which Pairs Are Most Active in Each Session
Different currency pairs concentrate their activity in different sessions, broadly following the home markets of the currencies involved.
- London and New York: EUR/USD and GBP/USD are most liquid here, with peak activity in the overlap. The euro and the pound are European currencies, and the dollar's data lands in the US morning.
- Asian (Tokyo) session: USD/JPY, AUD/USD, and NZD/USD see a larger share of their activity during Asian hours, driven by regional data and central bank events.
This is why the same pair can cost noticeably more to trade in one session than another. A euro or sterling position opened in the thin late-Asian window typically faces a wider spread than the same position opened during the London/New York overlap.
How Daylight Saving Time Shifts the Hours
Forex session times shift by about an hour twice a year, because London and New York observe daylight saving time, while GMT/UTC itself never changes.
This is the most common source of confusion when comparing session tables from different sources. GMT (and UTC) is a fixed reference that does not move with the seasons. Local clocks in London (which switches between GMT and British Summer Time) and New York (which switches between EST and EDT) do move, typically in late March and late October/early November, and the change dates do not line up exactly between regions. The practical effect is that the London and New York sessions, expressed in GMT, sit about an hour earlier during the northern-hemisphere summer than in winter. The session structure and the existence of the overlap never change; only the clock numbers do. The authoritative source for the exact open, close, and break times on any given account is always the instrument specification in the trading platform.
Liquidity, Spreads, and Slippage by Session
Session timing affects execution because liquidity and spreads are mechanically linked: more participants quoting at once narrows the bid/ask gap, and fewer participants widens it.
During the busy London and overlap hours, the deep order book compresses spreads on the majors to their tightest, and orders are more likely to fill close to the expected price. During thin periods such as the late Asian session, the weekend pre-open, and around the daily rollover, spreads tend to widen and the risk of slippage, the difference between the expected and actual fill price, rises. This is a description of typical conditions, not a guarantee: even in deep liquidity, a high-impact release can widen spreads and produce slippage in an instant.
Weekend Gaps and the Wednesday Triple Swap
Two timing mechanics sit outside the daily session rhythm and catch traders out: the weekend gap between Friday close and Sunday open, and the Wednesday triple-swap rollover.
The weekend gap. Forex closes for the weekend after the New York close on Friday and reopens with the Sydney session on Sunday evening (GMT). News over the weekend can move the market while it is shut, so the Sunday open can "gap" away from the Friday close. A stop-loss does not guarantee the stop price across a gap; it converts to a market order at the next available price, which can be worse than the level set. Positions held over the weekend carry this unhedgeable risk.
The Wednesday triple swap. A position held past the daily rollover incurs a swap (overnight financing) charge or credit. Because spot forex settles two business days forward, the swap charged on Wednesday is tripled to account for the weekend that the position will be carried over at settlement. This is why a position open over Wednesday's rollover sees three days of financing applied at once rather than one.
Frequently Asked Questions About Forex Trading Sessions
What are the four forex trading sessions?
The four forex trading sessions are Sydney, Tokyo (Asian), London (European), and New York (US). They run on overlapping schedules to keep the market open 24 hours a day, five days a week, as the trading day moves around the globe. London is the most active single session, and the London/New York overlap is the busiest window of the day.
What time does the forex market open and close?
The forex market opens with the Sydney session on Sunday evening (GMT) and closes after the New York session on Friday evening (GMT), trading continuously in between. Approximate GMT session hours are Sydney 21:00 to 06:00, Tokyo 23:00 to 08:00, London 07:00 to 16:00, and New York 12:00 to 21:00, shifting about an hour with daylight saving.
When is the London/New York overlap?
The London/New York overlap runs roughly from 12:00 to 16:00 GMT, when the London and New York sessions are open at the same time. It is the highest-liquidity window of the day, with the tightest spreads on the majors and most high-impact US data releases. The exact clock times shift by about an hour during daylight-saving periods.
What is the best time to trade forex?
Read strictly as execution conditions, the deepest liquidity and tightest spreads occur during the London/New York overlap, roughly 12:00 to 16:00 GMT. "Best" here means tighter spreads and a deeper order book, not a higher chance of profit, because higher liquidity and volatility can move price against a position as readily as in its favour. The right hours for any trader depend on the pairs they follow and their own circumstances.
Which currency pairs are most active during the Asian session?
During the Asian (Tokyo) session, the most active pairs are USD/JPY, AUD/USD, and NZD/USD, because the yen, Australian dollar, and New Zealand dollar are regional currencies and their data lands during these hours. The euro and sterling majors are quieter in the Asian session, and their spreads tend to be at their widest before London opens.
How does daylight saving time affect forex trading hours?
Daylight saving time shifts the London and New York session hours by about an hour twice a year, because those regions move their local clocks while GMT/UTC stays fixed. Expressed in GMT, the European and US sessions sit roughly an hour earlier in the northern summer than in winter. The session structure and overlaps do not change; only the clock numbers do.
What is a weekend gap in forex?
A weekend gap is a jump between the Friday close and the Sunday open, caused by news that moves the market while it is shut over the weekend. Because the market does not trade between the two, the Sunday open can be away from the Friday close. Stop-loss orders do not guarantee execution at the stop price across a gap, so weekend positions carry added risk.
Put Session Timing Into Practice
Knowing when liquidity concentrates is one piece of the wider picture covered in the how to trade forex pillar. To see how session timing shapes individual pairs, read the guides to EUR/USD, GBP/USD, and USD/JPY, or check how spreads behave across the day in the trading calculator. To rehearse execution at different hours without financial exposure, open a demo account.
Risk warning. Trading securities, futures, options, and contracts for differences are complex financial instruments that require knowledge and understanding. Prices can fluctuate significantly and securities may become valueless. Investors may incur losses exceeding the potential for profits. Trading on margin can result in losses greater than the amount initially deposited. Past performance is not necessarily a guide to future performance. The information in this article is for educational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any financial instrument. Consider whether CFD trading is appropriate for your circumstances and seek independent advice if necessary.
