It's now cheaper to travel to Europe than it has been in years

Flickr/aigle_dore Istanbul is now the cheapest destination in Europe.

Europe is known as one of the most expensive places to travel, but a strong dollar and weaker euro mean that international travelers can find some great deals on travel to the continent this summer.

TripAdvisor just released its TripIndex Europe report, which analyzes hotel prices and airfare to several European cities. The report found that the cost of a one-week summer trip to Europe has declined by an average of 11%.

Istanbul is the cheapest European city to visit this summer, with a one-week trip costing an average of $1,877 — 25% cheaper than it would have cost to travel there last year. The average nightly hotel rate in  Istanbul is only $97 and the average cost of airfare is $1,197. Over the last several years, Istanbul has been gaining popularity as one of the most popular travel destinations in the world, and now is an incredibly affordable time to travel there.

Other affordable destinations in Europe are Bucharest, Romania, where a one-week trip costs an average of $1,894, and Krakow, Poland, where a one-week trip costs an average of $1,938. The most expensive destinations in Europe are Edinburgh, Scotland; Reykjavik, Iceland;  London, and  Zurich.

See the chart below for more information on the cost of European travel this summer.