An extremely rare airfare sale (today only!) gets travelers north to Montreal, Quebec at a round-trip rate of $310.46.

This Air Canada exclusive is valid on trips finished on or before April 4, 2013 -- without the hassle of blackout dates.

To qualify, give at least a two-week advance notice of travel. Trips are permitted seven days a week, based on sale seat availability.

Air Canada serves Montreal from Atlanta with a flight connection in Toronto (stopovers not permitted).

How big of a deal is this? Other carriers charge $668.58 round-trip -- so a very nice savings of nearly 50 percent.

On stays through May 31, Tourism Montreal (www.tourisme-montreal.org) offers a "Sweet Deal" on short getaways at over 20 participating hotels. Stay a minimum of two nights and get a 50 percent rebate on the second consecutive night stay. At check-in, guests will also receive discount coupons on activities and transit bus and metro passes (a $200 value). This offer is based on double occupancy stays.

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.

Clara Bosonetto is a retired travel consultant.