It’s little wonder so many Canadians hop across the border for cheaper flights: A new study estimates Canada has the world’s highest costs for international air travel. And by a longshot. According to a survey by Kiwi.com, Canadians pay an average of US$94.66 per 100 km of international air travel on full-service airlines, compared to US$61.87 in Oman, the second-most expensive country. In the U.S., that averaged just $18.05. The least expensive country to fly internationally is China, with an average cost of US$2.84, the Kiwi.com survey found.

Canada also topped the list for international travel on low-cost airlines, at $43.70 per 100km, compared to $12.84 in the U.S. When it comes to domestic flights, Canadian fliers aren’t faring quite that badly. On the index of all flights, domestic and international, Canada ranked as only the sixth-most expensive country, behind the United Arab Emirates, Finland, Qatar, the Netherlands and Japan.