Travel dates: June 11 - Aug. 20

American, United, Delta, Virgin Atlantic, Air France and other airlines have launched sales on flights to Europe for travel throughout the summer. Some sales end as soon as June 4, and the lowest-priced seats will sell out fast, so booking soon is recommended.

To find the best fares, try departing on Saturday and returning on Tuesday.

Sample Roundtrip Fares (incl. Tax):

• Miami-Duesseldorf ... $729
• New York-Dublin ... $800
• Boston-London ... $884
• New York-Madrid ... $999
• New York-Oslo ... $1071
• Washington, D.C.-Helsinki ... $1146
• Phoenix-Madrid ... $1172
• St. Louis-Madrid ... $1179
• Houston-Madrid ... $1190
• Chicago-London ... $1199
• Chicago-Copenhagen ... $1214
• San Diego-Madrid ... $1242
• Tampa-Barcelona ... $1260
• Minneapolis-Madrid ... $1359
• Chicago-Stockholm ... $1321
• Orlando-London ... $1083
• Tampa-Madrid ... $1152
• Raleigh-Madrid ... $1192
• Atlanta-Frankfurt ... $1192

Travelzoo Tip: Make sure to select "My dates are flexible," and try searching several date ranges. Click on at least three travel providers to compare all fares and find the best deal for your destination.

SuperSearch uses more than 3.5 million consumer ratings and Travelzoo's years of expertise to help you find the best fares. Plus, you can easily compare multiple sites without entering your information over and over.