Seattle to LondonTime Converter

Seattle to London: the time difference

On 2026-10-05 at 9:00 AM in Seattle, it is 5:00 PM in London (Monday, October 5, 2026). London is 8 hours ahead of Seattle.

Seattle uses Pacific Time. When coordinating with Europe, early Seattle mornings are more likely to fit inside European working hours than Seattle afternoons. London is often described as being on GMT, but it uses British Summer Time during part of the year. Choosing Europe/London keeps both seasons attached to the same calendar event.

24-hour conversion table

Source date: 2026-10-05 in Seattle. Each row is a real instant; the destination date is shown explicitly. Repeated hours appear twice and nonexistent hours are labeled.

Does the time difference change during 2026?

Yes. The daily reference calculation finds 7 and 8-hour differences across the year. A repeating meeting tied to one city's clock can move on the other city's calendar.

Ranges sample each date at 12:00 UTC. A transition can occur partway through the first or last date. Use the converter for the precise instant. Calculated from this build’s Intl time-zone rules; future legislation may change them.

Seattle: The 2026 reference data includes UTC−08:00 and UTC−07:00. Select the actual meeting date: one fixed offset will not describe the whole year.

London: The 2026 reference data includes UTC+00:00 and UTC+01:00. Select the actual meeting date: one fixed offset will not describe the whole year.

Best time to call London from Seattle

For a one-hour call on 2026-10-05, these example start times fit a 9 AM–6 PM workday in both cities. A shared workday is not a guarantee that a person is free.

Customize working hours for Seattle and London.

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