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City to city

Seattle to London time — London is 8 hours ahead

London is 8 hours ahead of Seattle during standard time. The two cities keep the same gap throughout the year. Their normal working days overlap by roughly 1 hour.

Standard time

8 hours ahead

Applies while neither zone is on daylight saving — broadly November to March in the northern hemisphere.

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How the two zones line up

Seattle runs on America/Los_Angeles (UTC−8 in winter) and London on Europe/London (UTC+0). The difference between those offsets is what you add or subtract when converting a meeting time.

Daylight saving

The overlap is narrow — roughly an hour or two. Protect that window for anything that genuinely needs both parties live.

Where this conversion gets used

  • Transatlantic client calls
  • European market open
  • product launches
  • agency handovers
  • earnings announcements

Seattle to London — every hour

Both columns are computed from the IANA database, so they follow the real transition dates.

SeattleLondon — standard
12:00 am8:00 am
1:00 am9:00 am
2:00 am10:00 am
3:00 am11:00 am
4:00 am12:00 pm
5:00 am1:00 pm
6:00 am2:00 pm
7:00 am3:00 pm
8:00 am4:00 pm
9:00 am5:00 pm
10:00 am6:00 pm
11:00 am7:00 pm
12:00 pm8:00 pm
1:00 pm9:00 pm
2:00 pm10:00 pm
3:00 pm11:00 pm
4:00 pm12:00 am (next day)
5:00 pm1:00 am (next day)
6:00 pm2:00 am (next day)
7:00 pm3:00 am (next day)
8:00 pm4:00 am (next day)
9:00 pm5:00 am (next day)
10:00 pm6:00 am (next day)
11:00 pm7:00 am (next day)

Questions people ask

London is 8 hours ahead of Seattle throughout the year.

Related conversions

London to Toronto timeNew York to Dublin timeNew York to Madrid timeToronto to London time

All conversions →

Booking something recurring?

A fixed clock time drifts when either side changes its clocks. Our guides explain how to stop that happening.

Read the DST guidePlan a meeting