$688 to Madrid, Spain

Enjoy deep discounts on round-trip airfare to Madrid, Spain on travel started later this month and through February, 2012. This trio of deals are currently the lowest published round-trip airfares to the European continent.

• $179 round-trip: This low rate is valid seven days a week on Nov. 1-Dec. 8 departures. Stay a minimum of any three nights; one month maximum. Valid on USAirways via Philadelphia (a free stopover is permitted). Total ticket prices, inclusive of all taxes, fees and surcharges is $688.40.

• $189 round-trip: Valid valid seven days a week on departures started on or before Oct. 28. A two-week advance purchase notice is required. Stay at least one Saturday night and return within 30 days of departure. Stay a minimum of any three nights; one month maximum. Valid on USAirways via Philadelphia (a free stopover is permitted). Total ticket prices, inclusive of all taxes, fees and surcharges is $699.40.

• $190 round-trip: Depart any day of the week from Nov. 1-Dec. 8 or Jan. 10-Feb. 29. Travel is permitted seven days a week. Stay at least one Saturday night and return within 30 days of departure. Return travel to the U.S. is not allowed Dec. 17-23; Dec. 26-Jan. 4. Valid on Lufthansa via Frankfurt (stopovers not permitted). Total ticket prices, inclusive of all taxes, fees and surcharges is $752.50.

These offers have no ticket-by date, so buy tickets quickly before the low rates vanish.

Sale airfares are always subject to change. Every seat on every flight is not offered at the lowest rate. Since only a limited supply of seats is available, act quickly to make your purchase. I recommend starting the search for available seats at Kayak.com vs. calling an airline directly. You can also search for the sale at travel Web sites such as Expedia or Travelocity, etc. Airlines can discontinue or pull a sale price without notice when the offer does not have a "ticket-by" date or when the offer is deemed "sold out."