Best Meeting Time: London to San Francisco

London and San Francisco sit 8 hours apart during standard time, which leaves exactly 1 hour of working-day overlap when both cities operate 9am to 6pm. That single hour, 5pm to 6pm in London and 9am to 10am in San Francisco, is the entire window where both offices are open simultaneously. Anyone scheduling regularly across these two cities needs to treat that window with care.

Working Across London and San Francisco

The most active cross-city traffic between London and San Francisco runs through finance and technology. London is the largest financial centre in Europe, and its firms routinely work alongside San Francisco-based technology companies, venture capital funds, and payments businesses. A London-based investor relations team taking a call from a San Francisco fintech, or a UK bank evaluating a software contract with a Bay Area vendor, both face the same constraint: almost no shared working day. Technology companies in San Francisco often run a 10am to 7pm Pacific schedule specifically to stretch their overlap with European offices, which helps marginally but does not solve the core problem. On the London side, City of London finance workers are accustomed to late-day calls, partly because New York markets open at 2:30pm GMT and afternoon hours already carry transatlantic business. That culture makes a 5pm London call feel routine rather than exceptional. Media, legal, and life sciences also generate regular London to San Francisco traffic, particularly where UK companies are listed on US exchanges or have US distribution partnerships. Advertising agencies with offices in both cities face the same wall. The search for this page is almost always driven by one person trying to avoid scheduling a meeting at a time that is painful for at least one party.

Time Difference: London and San Francisco

San Francisco is currently 8 hours behind London. The live offsets are London UTC+1 and San Francisco UTC-7. London observes daylight saving and San Francisco also observes daylight saving, so the offset shifts twice a year if both sides aren't already aligned.

London observes GMT (UTC+0) in winter and BST (UTC+1) in summer. San Francisco runs on PST (UTC-8) in winter and PDT (UTC-7) in summer. Both cities observe daylight saving time. During standard time, the gap is 8 hours. During summer, when both are on their respective daylight offsets, the gap remains 8 hours: UTC+1 minus UTC-7 equals 8. The gap does not change once both cities have made the switch. However, there is a short period each autumn where the gap temporarily shifts. The United Kingdom moves its clocks back one week earlier than the United States: the UK returns to GMT on the last Sunday of October, while the US does not revert to standard time until the first Sunday of November. During that intervening week, San Francisco is still on PDT (UTC-7) while London is back on GMT (UTC+0), making the gap 7 hours rather than 8. That same asymmetry does not apply in spring, when the US change in March happens before the UK change at the end of March, briefly widening the gap to 9 hours for roughly one week. In practical terms, anyone with a standing weekly call should check both changeover dates and adjust invites accordingly.

Best Times to Meet

The working-day overlap between London and San Francisco is 1 hour: 5pm to 6pm in London and 9am to 10am in San Francisco. That is the only window where both offices are open on standard 9am to 6pm schedules. Inside that 1-hour window, 9am Pacific is the cleanest slot. San Francisco participants are freshly at their desks, before the calendar fills with internal meetings, and the coffee-meeting culture that runs 7am to 9am Pacific has already wound down. London participants, at 5pm, are past the standard lunch window of 12:30 to 1:30pm and into the late-afternoon period when finance teams in particular are accustomed to transatlantic calls. City of London workers are often still active at 5pm precisely because New York opens at 2:30pm GMT and that rhythm pushes business later in the day. Friday afternoons are the one exception: UK office culture tends to wind down by 4pm on Fridays, which means a 5pm London Friday call is more likely to encounter out-of-office replies or reduced attendance. Scheduling the weekly call for Tuesday, Wednesday, or Thursday at 5pm London time is consistently more reliable.

These conversions use the current UTC offsets: London at UTC+1 (BST) and San Francisco at UTC-7 (PDT), giving an 8-hour gap. 9am Monday in London = 1am Monday in San Francisco. This is the middle of the night in San Francisco and entirely outside working hours. 1pm Monday in London = 5am Monday in San Francisco. Still pre-dawn in San Francisco; no working overlap. 5pm Monday in London = 9am Monday in San Francisco. This is the one slot where both cities are in their working day simultaneously, and it represents the full extent of the 1-hour overlap window. During the week in late October when the UK has moved back to GMT but the US remains on PDT, the gap narrows to 7 hours. In that week only, a 4pm London call equals 9am in San Francisco.

Working Hours Overlap Explained

London operates on Europe/London (currently UTC+1). San Francisco operates on America/Los_Angeles (currently UTC-7). The table below maps a standard 9:00 AM–6:00 PM day in London to San Francisco's local time.

Tips for Scheduling Across London and San Francisco

• The UK returns to GMT one week before the US leaves PDT each autumn, temporarily narrowing the gap to 7 hours.
• San Francisco's 9am to 10am slot fills fast. Book the London-side 5pm call early in the week, not on Friday.
• London finance teams are accustomed to 5pm transatlantic calls. That cultural norm works strongly in favour of this overlap slot.
• Thanksgiving week empties San Francisco offices from Wednesday through Friday; London will not have a matching holiday, so the asymmetry catches people out.
• If San Francisco runs a 10am to 7pm shift, the overlap with London extends slightly into the 6pm to 7pm London hour, useful for overflow calls.

Public Holidays and Working Weeks

UK office workers generally operate 9am to 5:30pm, with Fridays often finishing around 4pm. Lunch runs from roughly 12:30pm to 1:30pm, and informal finance meetings between 5pm and 6pm are common in London. San Francisco tech companies often extend their day to 10am to 7pm Pacific specifically to increase overlap with East Coast and European counterparts. Morning hours in San Francisco, 7am to 9am, tend to be filled with coffee meetings and pre-calendar conversations rather than structured calls. Scheduling a London to San Francisco meeting should account for both patterns. The most reliable window remains 5pm to 6pm London time, aligning with 9am to 10am in San Francisco before the SF calendar becomes congested. On public holidays: London observes New Year's Day on 1 January, the May Bank Holiday on the first Monday of May, and Christmas Day on 25 December. San Francisco observes Independence Day on 4 July, Thanksgiving on the fourth Thursday of November, and Christmas Day on 25 December. Thanksgiving is a particularly significant scheduling gap: it is not a UK holiday, so London teams may send meeting requests for that week without realising that San Francisco counterparts are largely unavailable from Wednesday through Friday. Similarly, the May Bank Holiday in London falls on a date that has no US equivalent, and San Francisco teams will not know to avoid it unless explicitly told.

Recommended Scheduling Tools

Some links are affiliate links. We only recommend tools we'd use ourselves. They don't cost you anything extra.

Related City Pairs

Frequently Asked Questions