Ticket prices for summer flights to Europe reached new lows this week as already intense competition increased among airlines serving European destinations. Some fares now are priced 50% less than they were at the same time last year.

Flights from Boston and Burlington, Vermont, can be found as low as $455 roundtrip for departures through August (fares are roundtrip, including all taxes and fees; found as of June 3, 11:00AM ET):

• Boston-Madrid ... $455
• Boston-Dublin ... $486-$573
• Boston-Berlin ... $557-$626
• Burlington-Frankfurt ... $559-$611
• Burlington-Madrid ... $646-$770

How to find the lowest fares and book flights: Find the cheapest dates to travel with Travelzoo’s new Fly.com airfare search site.  Fly.com allows you to find and compare prices from dozens of airline and travel agency sites. Travelers book directly with the airline or travel agency sites. For many destinations, Fly.com shows fares in an easy-to-use calendar format.

• Barcelona
• Berlin
• Dublin
• Madrid
• London
• Prague
• Vienna

Fly.com fare calendars from Burlington, VT:

• Amsterdam
• Dublin
• Frankfurt
• London
• Madrid
• Paris

For other routes, go directly to Fly.com to search for desired travel dates and destinations.

Travelzoo Tip: Europe hotels are also at record-low prices this summer. For a list of locally sourced hotel deals across Europe, click here.