
USA
Visa requiredA transit visa is REQUIRED to connect through the USA
The USA has no airside (sterile) transit — even if you only change planes you pass through immigration. Turkish citizens cannot transit via the USA without a valid C-1 transit or B1/B2 visa; you will be denied boarding.
Exemption. No problem if you hold a valid US visa (C-1 / B1 / B2) or a US green card.
Official source: travel.state.gov

United Kingdom
Visa requiredYou may need a DATV to transit the UK
Turkish citizens must obtain a Direct Airside Transit Visa (DATV) to transit airside through the UK (Turkey is on the DATV list). You remain in the transit area for up to 24 hours without passing immigration.
Exemption. A valid US/Canada/Australia/New Zealand visa or certain EU/Schengen permits may exempt you — check your case on gov.uk.
Official source: gov.uk

Canada
Visa requiredA transit visa/permit is required through Canada
Turkish citizens are not eligible for Canada's eTA; a transit visa (or the Transit Without Visa program, if eligible) is required to connect by air through Canada. You cannot transit without a visa/permit.
Exemption. Only specific programs (e.g. Transit Without Visa with a US visa on eligible routes) provide exemption; a transit visa is usually required.
Official source: canada.ca

Schengen area
ConditionalAn airport transit visa (ATV) may be needed via Schengen
Some Schengen countries (Germany, the Netherlands, France, Spain…) require Turkish citizens to hold an airport transit visa (type A / ATV) when connecting to a destination OUTSIDE Schengen.
Exemption. A valid Schengen visa (in some countries a valid US/Canada visa or residence permit) exempts you from the ATV. If your destination is itself in Schengen you will already hold a Schengen visa, so this connection is not a problem.
Official source: schengenvisainfo.com

China
ConditionalChina connection — 24-hour visa-free transit (conditional)
Turkish citizens are not included in China's extended 240-hour visa-free transit; only up to 24-hour visa-free transit (TWOV) applies, provided you hold an onward ticket to a third country and stay within the airport's restricted area.
Exemption. Under 24 hours, same airport, onward ticket to a third country → visa-free. Otherwise a China visa is required.
Official source: en.nia.gov.cn

Russia
Usually fineAirside transit in Russia is visa-free up to 24 hours
A connection of up to 24 hours at the same airport, without leaving the international transit area, is visa-free for Turkish citizens.
Exemption. If you leave the airport/transit area or switch to a different airport, a Russian (e-)visa is required.
Official source: vfsglobal.com

USA
Visa requiredA special (green) passport also needs a US transit visa
A green passport grants no US visa exemption; there is no airside transit in the USA. Without a valid C-1 or B1/B2 visa you cannot connect through the USA.
Exemption. No problem with a valid US visa (C-1 / B1 / B2) or a US green card.
Official source: travel.state.gov

United Kingdom
Visa requiredThe UK transit rule also applies to a special (green) passport
A green passport grants no UK visa exemption; a Direct Airside Transit Visa (DATV) may be required for airside transit (Turkey is on the DATV list).
Exemption. A valid US/Canada/Australia/New Zealand visa or certain EU/Schengen permits may exempt you — check on gov.uk.
Official source: gov.uk

Canada
Visa requiredA special (green) passport also needs a Canada visa
A green passport grants no Canada visa exemption (Turkey is not eTA-eligible); a transit visa is required to connect through Canada.
Exemption. Only specific programs (e.g. Transit Without Visa with a US visa on eligible routes) provide exemption; a visa is usually required.
Official source: canada.ca

Schengen area
Usually fineA special (green) passport needs NO Schengen transit visa
Green passport holders enter the Schengen area visa-free for up to 90 days in any 180-day period, so an airport transit visa (ATV) is not an issue when connecting via Schengen — you may even leave the transit area and enter.
Exemption. Mind the 90/180-day rule; if your total stay exceeds 90 days a visa/permit is required.
Official source: mfa.gov.tr

China
Usually fineA special (green) passport — 30 days visa-free to China
Green passport holders may enter China visa-free for up to 30 days, so the 24-hour transit limit does not apply to you when connecting via China; you can enter/transit freely.
Exemption. For stays over 30 days a China visa is required.
Official source: mfa.gov.tr

Russia
Usually fineA special (green) passport — 30 days visa-free to Russia
Green passport holders may enter Russia visa-free for up to 30 days, so leaving the transit area and entering is not a problem either.
Exemption. For stays over 30 days a Russian (e-)visa is required.
Official source: mfa.gov.tr