It is the responsibility of the traveler to gather information about and obtain required travel documents, visas and travel authorizations (as applicable) needed for entry into the destination country. This includes, but is not limited to, ESTA for travel to the USA and eTA for travel to Canada.
Traveling through Keflavik airport in Iceland
Passengers, traveling onwards through Keflavík airport in Iceland, that do not hold a passport from a Schengen Member State, do not need a Schengen transit visa unless leaving the transit area. That means that if you are just passing by the airport, on your way to your destination you do not need a Schengen visa. Please note that this does not apply to passengers traveling with a passport from Afghanistan, Bangladesh, The Democratic Republic of Congo, Eritrea, Ethiopia, Ghana, Iran, Iraq, Nigeria, Pakistan, Somalia, and Sri Lanka.
Passengers visiting Iceland before continuing their travel need to make sure that they are allowed to visit the Schengen area before entering the country.
Traveling to Europe
Citizens of the United States with a valid U.S. Tourist passport (blue passport) can travel within the Schengen Area for a maximum of 90 days without having to apply or obtain a Schengen visa for short-term tourism or a business trip. Read more: https://travel.state.gov
Traveling to the United Kingdom
When arriving in the UK your passport will be checked upon arrival. It must be valid for the length of your stay. A valid visa might also be required before entering the country, depending on your nationality and purpose of stay. Read more: https://www.gov.uk/uk-border-control
Some countries require that all airlines collect Advanced Passenger Information (API/APIS) from all passengers prior to travel. Read more: https://wowair.us/travel-info/apis-and-esta
Traveling to the USA
It is a requirement of the US Department of Homeland Security for all passengers eligible to travel under the Visa Waiver Program to apply for an Electronic System Travel Authorisation (ESTA).
ESTA applications must be submitted at least 72 hours prior to departure to the USA. Passengers without ESTA approval have the risk of being denied boarding.
Read more: https://wowair.us/travel-info/apis-and-esta
Traveling to Canada
Passengers traveling to Canada must have a valid visa, or for those eligible, apply for an Electronic Travel Authorization (eTA). This includes those with a study/work permit. Exceptions include Canadian citizens or dual Canadian citizens, Canadian permanent residents, or U.S. citizen. (However, lawful permanent residents of the U.S. need an eTA if traveling by air.) We always recommend getting an eTA before booking your flight to Canada. Read more: https://wowair.co.uk/travel-info/eta
Traveling to Israel
If you are traveling to Israel, and your country of nationality does not have a Visa Waiver Program with Israel, you will need to apply for a visa. All visitors need to a have a passport valid for at least six months from the date of departure.
See also: Passport requirements