In the last few days, deeply slashed airfares to Europe have been popping up for a matter of hours and then suddenly disappearing. Even I couldn’t act fast enough to land one particular screaming deal to Ireland.

But there’s a pair of specially-priced rates up for grabs today (8/31) that budget travelers should act very quickly on.

Round-trip rates of $794.10 to Berlin, Germany and $788.80 to Paris are good any available day of the week starting on or after Nov. 1. Departures at these rates are permitted through July 28, 2013. What’s more is that these rates have no blackout dates and there is no minimum stay requirements. Stay up to one year, if you so desire.

This is an extremely rare occurrence that an airfare so affordable is valid during the peak year-end holidays, and through the high season of late spring and summer.

This is an exclusive United Airlines offer. United serves Berlin and Paris with one flight connection in Newark, N.J. or Washington D.C.

So get going on this offer and start the search for available seats on United Airlines at Kayak.com. Don’t call the carrier directly. You can also search for the sale at travel websites such as Expedia or Travelocity, etc.

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, make haste on your ticket purchase.

Clara Bosonetto is a retired travel consultant.