Call United States from United Kingdom

When calling internationally, it's important to consider time zone differences to ensure you're calling at a convenient time.

When calling the United Kingdom, which operates on GMT (UTC+0) in winter and BST (UTC+1) in summer, aim for late morning to early afternoon your time if you're calling from the Americas, or early evening if calling from Asia to catch UK business hours (9 AM-5 PM). Remember that the UK switches to Daylight Saving Time on different dates than many countries, typically the last Sunday in March and October, so verify the current time difference before important calls. When calling the United States, remember that the country spans four main time zones: Eastern (UTC-5), Central (UTC-6), Mountain (UTC-7), and Pacific (UTC-8), with most states observing daylight saving time from March to November (adding +1 to each). For the best chance of reaching someone during business hours (9 AM - 5 PM local time), call between 2-10 PM UTC for Eastern time or 5 PM - 1 AM UTC for Pacific time, adjusting one hour earlier during daylight saving time.