Airfare deals to Hawaii are few and far between, which makes a today-only deal from US Airways a welcome treat for budget travelers.

The carrier offers a round-trip rate of $660 to Honolulu, Oahu, and the deal has no rules or gotchas.

An advance purchase notice isn’t required, so leave as soon as this weekend. This rate is valid seven days a week, based on sale seat availability. There are no blackout dates, and the last permitted day of travel is Nov. 10, 2013.

That’s it. But make haste to buy your ticket since this offer could vanish at anytime.

US Airways serves Honolulu with one flight connection in Phoenix.

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 websites such as Expedia, Orbitz 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.”

Clara Bosonetto is a retired travel consultant.