Best time to call London from New York

Quick answer

If you only have time for the headline, here it is. London is 5 hours ahead. The safest universal slot is 9 AM Eastern = 2 PM London. Different purposes need different slots — the table below is the one I wish people gave me when I started running calls across the Atlantic.

If you want the full picture — including the four weeks a year when this table is quietly wrong — keep reading.

The 5-hour problem

The official gap between New York and London is 5 hours. New York runs Eastern Time (EST in winter, EDT in summer). London runs UK time (GMT in winter, BST in summer). Both observe daylight saving, which is the entire reason the gap feels stable — they shift together, mostly.

The catch is that they do not shift on the same day. The UK moves clocks forward on the last Sunday of March. The US moves clocks forward on the second Sunday of March. In 2026 that is March 8 for the US and March 29 for the UK. For three weeks — March 8 through March 28 — London is only 4 hours ahead of New York, not 5. Every recurring meeting you have set to "2 PM London" now lands at 10 AM New York instead of 9 AM. Nobody notices until somebody is late.

The same thing happens in reverse in autumn. The UK falls back on the last Sunday of October (October 25, 2026). The US falls back on the first Sunday of November (November 1, 2026). For one week — October 25 through October 31 — London is again only 4 hours ahead. Then the standard 5-hour gap snaps back into place and stays there until the next March.

Counted up, that is four weeks a year where the textbook answer is wrong. If you run any kind of recurring transatlantic call, you should be auditing your calendar in mid-February and mid-September. Most calendar tools will hold the wall-clock time in the inviter's zone, which means one side experiences a one-hour shift and the other does not. People will quietly miss meetings.

For the full transition dates and the math, see our DST 2026 survival guide. For the side-by-side hour grid showing exactly what hour it is in London when it is N o'clock in New York, see our EST vs GMT comparison page.

Why 9 AM ET = 2 PM London is the textbook answer — and when it's wrong

The reason 9 AM ET is the default is mechanical. It is the earliest time a New Yorker can credibly be at a desk and the earliest time a Londoner is reliably back from lunch. Both sides are in the middle of their working day, both sides have checked email at least once, both sides are likely caffeinated. The signal-to-noise ratio on a 9 AM ET call is as good as it gets in a transatlantic relationship.

That is the case for it. Now the case against. 9 AM Eastern is the most popular meeting slot in New York, full stop. Your prospect's calendar already has three meetings stacked there. The person you are trying to reach in London has spent the last hour fielding internal calls and is about to think about ducking out for tea. The 2 PM London slot also catches the post-lunch energy trough, which is real and which most people deny experiencing. If you are running a long-form discovery call or a workshop, 2 PM is not the best time to be on the receiving end.

The other failure mode is when the call is high-context and needs preparation. If a Londoner has to read a five-page brief before your 2 PM, they will read it at 1:55. They have been in meetings since 9 AM their time. Their morning was somebody else's. Better to schedule for 3 PM London (10 AM ET) and explicitly ask them to spend the 2 PM hour reading. They will, because the meeting is anchored and the prep window is contained.

If you are scheduling a sales discovery call, 8 AM ET = 1 PM London is the most underused slot on the calendar. Londoners are warm from lunch, the day's priorities have settled, and you are getting them before the 3 PM slump and well before the 5 PM rush to leave. New York is quiet, which means you are present and focused too. The drawback is you need to be at your desk by 8, which is a real ask. The conversion rate uplift is worth it.

The 4 PM London slot: 11 AM ET, fresh on both sides

There is a slot that gets ignored because it looks like end-of-day: 11 AM New York = 4 PM London. People assume Londoners are mentally checked out and Americans are only just getting started. Both assumptions are wrong if you frame it right.

4 PM London is, in practice, the slot where the morning meeting block has ended, lunch is digested, and the afternoon is structured around either focus work or catch-up calls. Londoners often save short, transactional calls for this window precisely because their best hours are gone and they would rather not waste them on a status update. For your call, that is a feature. If you are syncing on progress, transferring information, or handing off context, 4 PM London is more productive than 2 PM.

11 AM ET on the New York side is the sweet spot before lunch. You have cleared your inbox, you have had your stand-up, you have done your first piece of focus work. A 30-minute call here costs you nothing because lunch is the natural breaking point afterwards. Compare that to a 2 PM ET call which sits awkwardly in the middle of your afternoon block.

The catch: do not use this slot for decisions that need the Londoner's best judgement. Use it for handoffs, demos, status, agreed-action review, and casual check-ins. Use 9 AM ET for the actual decisions.

Try this side by side in our meeting scheduler with London and New York selected. It shades the overlap window and shows you exactly where both calendars are inside working hours.

Family calls: be honest about the tradeoff

Family calls across the Atlantic are awkward because the workable windows are narrow and they tend to require one side to give something up. Pretending otherwise leads to calls that get cancelled because neither side really wants to be on them.

The honest options:

Sunday morning New York = Sunday afternoon London. 9 AM in New York is 2 PM in London. Both sides are awake, neither is at work, neither is about to eat dinner. This is the textbook family-call slot for a reason. The downside is it requires actually getting up on a Sunday, which is a higher bar in New York than it sounds.

Saturday or Sunday late morning in NY = late afternoon in London. 11 AM ET = 4 PM London works on weekends because the London side has not started thinking about dinner yet (7-8 PM is standard there) but is genuinely relaxed. This is the second-best slot.

Weekday early morning NY = lunchtime London. 7 AM ET = noon London. Brutal on you, fine for them. Reserve for short check-ins where they have something they want to tell you and you can manage being half-awake. This is the slot that breaks when the calls drift past 20 minutes.

Weekday early evening NY = late night London. 6 PM ET = 11 PM London. Avoid unless explicitly agreed. The London side will say yes once, then quietly resent it.

The mistake I see most often: people try to use weekday 7-8 PM New York for family calls. That is midnight to 1 AM London. It does not work and it never has. If you cannot find a weekend slot, find a 30-minute window at 7 AM New York and protect it ruthlessly.

Emergency calls: any time, just frame it

If something is actually urgent, time zones do not apply. Call. The mistake is framing an emergency as a routine call and getting cross when the response is tepid. "Hey, got a minute?" at 11 PM London time is a question with no good answer. "This is urgent and I need 10 minutes — sorry about the hour" is a question with one clear answer.

The framing is the entire game. Be explicit about urgency, be explicit about the expected length, be explicit that you acknowledge the inconvenience. The London side will pick up and they will not hold it against you. They will hold it against you if you do not frame it, then turn out to want to chat for 45 minutes.

The same principle applies to text-message handoffs ahead of a call: "I know it's late, do you have 10 minutes in the next hour for X" is fine. Cold ringing at 1 AM with no context is not.

Convert any time, both directions

The widget below is the same time zone converter we use ourselves. London and New York are pre-loaded. Type a time in either zone and the other updates live. It also handles DST transitions correctly, including the four weeks a year when the gap is 4 hours instead of 5.

For ongoing coordination, bookmark the EST vs GMT side-by-side grid or the EDT vs BST grid for summer. They show the full 24-hour overlap so you can scan for windows at a glance.

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