Look for Overseas Discount Carriers
Flights by low-cost foreign airlines (such as EasyJet, based in the United Kingdom) don’t show up on Expedia.com or Orbitz.com. But you can still take advantage of their rock-bottom prices: Book a ticket to a hub like Paris or Rome on a major carrier, then use Skyscanner.com or Momondo.com to reserve seats on a low-fare airline if you’re headed to a smaller city, like Copenhagen or Nice. “These tickets can be ridiculously cheap. My husband recently flew from London to Girona, Spain, for less than $20 one way,” says Pauline Frommer, the creator of the Pauline Frommer Guides travel books.