When it is 09:00 in London it is 03:00 in Chicago in January and 03:00 in July. Chicago is 6 hours behind London right now — and the difference is the same all year. This page gives the live times in both cities, the overlap between their working days, the daylight saving dates that move the difference, and the best meeting windows.
Try the tool: Time Zone Converter — convert any time between London and Chicago, with the offset for the date you pick.
Live times in London and Chicago
The two cities side by side. The January column uses the winter offsets (London UTC+00:00, Chicago UTC−06:00); the July column uses the summer offsets (London UTC+01:00, Chicago UTC−05:00).
| Time in London | Chicago in January | Chicago in July |
|---|---|---|
| 00:00 | 18:00 | 18:00 |
| 06:00 | 00:00 | 00:00 |
| 09:00 | 03:00 | 03:00 |
| 12:00 | 06:00 | 06:00 |
| 15:00 | 09:00 | 09:00 |
| 17:00 | 11:00 | 11:00 |
| 21:00 | 15:00 | 15:00 |
The world clock shows the current time in both cities live, and the individual city pages — time in London and time in Chicago — explain each city's time zone, offsets and daylight saving in full.
The time difference between London and Chicago
The difference is constant: Chicago is 6 hours behind London on every day of the year. That is the simplest case in time-zone work — the answer does not depend on the date, and a meeting set for 09:00 in London is always 03:00 in Chicago. The reason the difference never changes is that both cities observe daylight saving and change their clocks on the same dates.
To convert a time, add the difference: 09:00 in London is 03:00 in Chicago in January and 03:00 in July; 17:00 in London — the end of the working day — is 11:00 in Chicago in January and 11:00 in July. To go the other way, subtract it: 09:00 in Chicago is 15:00 in London in January. The time difference calculator does the arithmetic for any date, and the UTC to Chicago page gives the full conversion table for Chicago.
Meeting overlap between London and Chicago
The overlap is the hours when both cities are in their working day (09:00–17:00 local time). The table marks the overlapping hours in London's working day and shows what time they are in Chicago.
January
| London time | Chicago time | Both working? |
|---|---|---|
| 09:00 | 03:00 | Yes |
| 10:00 | 04:00 | Yes |
| 11:00 | 05:00 | Yes |
| 12:00 | 06:00 | Yes |
| 13:00 | 07:00 | Yes |
| 14:00 | 08:00 | Yes |
| 15:00 | 09:00 | Yes |
| 16:00 | 10:00 | Yes |
In January the overlap is 8 hours: 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 London time. In July it is 8 hours: 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 London time. The meeting planner finds the overlap for any two cities and any date, and the meeting time finder finds it for a whole team.
Daylight saving in London and Chicago
London observes daylight saving: in 2026 the clocks go forward on 29 March 2026 and back on 25 October 2026, moving the offset from UTC+00:00 to UTC+01:00.
Chicago observes daylight saving: in 2026 the clocks go forward on 8 March 2026 and back on 1 November 2026, moving the offset from UTC−06:00 to UTC−05:00.
The difference changes on Sunday, 8 March 2026 and Sunday, 29 March 2026 and Sunday, 25 October 2026 and Sunday, 1 November 2026 in 2026. On those dates, one city changes its clocks and the other does not — or they change on different days — so the difference moves by an hour. A standing meeting set in one city's local time will land an hour early or late on the other side until the second city catches up. The fix is to set the calendar event in UTC, or to check the overlap again after each change. The individual DST pages — London DST 2026 and Chicago DST 2026 — give the exact dates for each city.
Best meeting windows
The best windows in January are 09:00–17:00 in London (03:00–11:00 in Chicago). These are the hours inside both working days, so nobody is up early or late. It is a short window, so keep the meeting short and send an agenda in advance.
Calling and travel notes
When it is 09:00 in London it is 03:00 in Chicago in January; when it is 12:00 in London it is 06:00 in Chicago; when it is 17:00 in London it is 11:00 in Chicago. The difference is under 12 hours, so the two cities are usually on the same date — but check the date for late-evening and early-morning times, when the date can differ by a day. Scheduling between the Americas and Europe is the easiest intercontinental case: the difference is 5–9 hours, so the working days overlap for several hours. The best window is late morning in London and afternoon in Chicago (or the reverse), when both sides are in their working day. Watch the three weeks in March when the United States has changed its clocks and Europe has not — the overlap shifts by an hour, and standing meetings land at the wrong time.
Worked conversions
Six conversions, for January (offsets London UTC+00:00, Chicago UTC−06:00):
| London | Chicago |
|---|---|
| 08:00 | 02:00 |
| 09:00 | 03:00 |
| 12:00 | 06:00 |
| 14:00 | 08:00 |
| 17:00 | 11:00 |
| 20:00 | 14:00 |
In July, the answers are the same. For the reverse direction, see Chicago to London time.
London and Chicago at a glance
| Fact | London | Chicago |
|---|---|---|
| Country | United Kingdom | United States |
| Region | Europe | Americas |
| IANA time zone | Europe/London |
America/Chicago |
| Standard offset | UTC+00:00 | UTC−06:00 |
| Daylight saving offset | UTC+01:00 | UTC−05:00 |
| Offset in January 2026 | UTC+00:00 | UTC−06:00 |
| Offset in July 2026 | UTC+01:00 | UTC−05:00 |
| Observes daylight saving | Yes | Yes |
The table is the whole pair in one place. The two numbers that matter most are the January and July offsets: if they are the same in both columns for a city, that city's offset never changes; if they differ, the city observes daylight saving and the difference between the cities moves with it. The individual city pages — time in London and time in Chicago — explain each city's time zone, and the DST pages — London DST 2026 and Chicago DST 2026 — give the exact change dates.
Frequently asked questions
What is the time difference between London and Chicago?
Chicago is 6 hours behind London right now. In January the difference is 6 hours behind and in July it is 6 hours behind — it is the same all year.
How do I schedule a recurring meeting between London and Chicago?
Pick a time inside the overlap — 09:00–17:00 London time — and set the calendar event in UTC so it moves correctly when the clocks change. Re-check the overlap in March and October, when the difference moves, and rotate the time if the meeting falls outside someone's working day.
What time is it in Chicago when it is 09:00 in London?
It is 03:00 in January and 03:00 in July. The time zone converter gives the answer for any date.
What is the best time for a meeting between London and Chicago?
The best windows in January are 09:00–17:00 London time — inside both working days.
Does the time difference between London and Chicago change during the year?
No. The difference is 6 hours behind all year, because both cities change their clocks on the same dates.
What time is it in London when it is 09:00 in Chicago?
It is 15:00 in January and 15:00 in July. See Chicago to London time for the full comparison from Chicago's side.
What are the time zones of London and Chicago?
London is in Europe/London (UTC+00:00 standard time) and Chicago is in America/Chicago (UTC−06:00 standard time).
What time is it in London when it is midnight in Chicago?
It is 06:00 in London in January and 06:00 in July — the previous day, because Chicago is ahead of London. Midnight conversions are the ones that most often land on the wrong date, so always check the date as well as the time.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's time zone converter and meeting planner — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.