Chicago to Thunder Bay time converter

Thunder Bay is 1 hour ahead of Chicago. When it is 9:00 AM in Chicago, it is 10:00 AM in Thunder Bay.

Chicago CDT

Sunday, October 18, 2026

Thunder Bay EDT

Sunday, October 18, 2026

Chicago
Illinois, United States
Sun, Oct 18
CDTUTC-5
Thunder Bay
Ontario, Canada
Sun, Oct 18
EDTUTC-4+1h
Finding your time zone…
Shared working hours (9:00–18:00)

Chicago to Thunder Bay conversion table

Every hour of today in Chicago and the matching time in Thunder Bay. Light rows are typical working hours (9:00–18:00).

ChicagoThunder Bay
12:00 AM1:00 AM
1:00 AM2:00 AM
2:00 AM3:00 AM
3:00 AM4:00 AM
4:00 AM5:00 AM
5:00 AM6:00 AM
6:00 AM7:00 AM
7:00 AM8:00 AM
8:00 AM9:00 AM
9:00 AM10:00 AM
10:00 AM11:00 AM
11:00 AM12:00 PM
12:00 PM1:00 PM
1:00 PM2:00 PM
2:00 PM3:00 PM
3:00 PM4:00 PM
4:00 PM5:00 PM
5:00 PM6:00 PM
6:00 PM7:00 PM
7:00 PM8:00 PM
8:00 PM9:00 PM
9:00 PM10:00 PM
10:00 PM11:00 PM
11:00 PM12:00 AM+1 day

Best time to call or meet

Both sides are at work from 9:00 AM – 5:00 PM in Chicago (10:00 AM – 6:00 PM in Thunder Bay).

Daylight saving time and the difference

The difference changes during the year because Chicago and Thunder Bay switch clocks on different dates:

  • Oct 18, 2026 – Nov 1, 2026: +1h
  • Nov 1, 2026 – Nov 1, 2026: ±0
  • Nov 1, 2026 – Mar 14, 2027: +1h
  • Mar 14, 2027 – Mar 14, 2027: +2h
  • Mar 14, 2027 – Oct 18, 2027: +1h

Distance

Chicago and Thunder Bay are 737 km (458 miles) apart in a straight line.

More conversions

Thunder Bay to ChicagoChicago to New YorkChicago to LondonChicago to Los AngelesChicago to TorontoChicago to São PauloChicago to ParisChicago to BerlinChicago to MoscowChicago to DubaiChicago to New DelhiChicago to BangkokChicago to Singapore
New York to Thunder BayLondon to Thunder BayLos Angeles to Thunder BayToronto to Thunder BaySão Paulo to Thunder BayParis to Thunder BayBerlin to Thunder BayMoscow to Thunder BayDubai to Thunder BayNew Delhi to Thunder BayBangkok to Thunder BaySingapore to Thunder Bay

Questions and answers

What is the time difference between Chicago and Thunder Bay?

Thunder Bay is 1 hour ahead of Chicago.

What time is it in Thunder Bay when it is 9 AM in Chicago?

When it is 9:00 AM in Chicago, it is 10:00 AM in Thunder Bay.

When is the best time to call Thunder Bay from Chicago?

Both sides are at work from 9:00 AM – 5:00 PM in Chicago (10:00 AM – 6:00 PM in Thunder Bay).

Does the time difference between Chicago and Thunder Bay change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.