By Jimmy Im, CNBC
If you think summer vacation is too expensive and you're looking for deal, August is the cheapest travel month of the season, especially to Europe, according to flight booking app Hopper.
Prices for round-trip flights from the U.S. to Europe drop as much as 47 percent from peak months June and July, and now is the most optimal time to buy airfare for travel next month, finds Hopper.
[post_ads]For its methodology, Hopper used data that analyzed consumer airfare searches to Europe, collecting 10 to 15 billion airfare price quotes every day all across the web.
The best savings to a European city in August? Helsinki, Finland. The average late summer price is $741 compared to the peak summer price of $1,388, a 47 percent discount.
Below is the list of 11 European cities to which flights have the biggest price drops for August, compared to June and July, with three cities — Helsinki; Oslo, Norway; and County Clare, Ireland — under $800.
1. Helsinki, Finland
Average late summer price: $741
Average peak summer price: $1,388
Percentage discount: 47 percent
2. Malmo, Sweden
Average late summer price: $1,418
Average peak summer price: $2,590
Percentage discount: 45 percent
3. Rotterdam, Netherlands
Average late summer price: $1,377
Average peak summer price: $2,509
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Percentage discount: 45 percent
4. Cologne, Germany
Average late summer price: $1,254
Average peak summer price: $2,266
Percentage discount: 45 percent
5. Oslo, Norway
Average late summer price: $788
Average peak summer price: $1,420
Percentage discount: 45 percent
6. Stockholm, Sweden
Average late summer price: $834
Average peak summer price: $1,489
Percentage discount: 44 percent
7. County Clare, Ireland
Average late summer price: $787
Average peak summer price: $1,401
Percentage discount: 44 percent
8. Naples, Italy
Average late summer price: $1,064
Average peak summer price: $1,862
Percentage discount: 43 percent
9. Palma de Mallorca, Spain
Average late summer price: $1,082
Average peak summer price: $1,867
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Percentage discount: 42 percent
10. Geneva, Switzerland
Average late summer price: $1,064
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Average peak summer price: $1,862
Percentage discount: 41 percent
11. Amsterdam, Netherlands
Average late summer price: $872
Average peak summer price: $1,472
Percentage discount: 41 percent