Maximize Frequent Flyer Miles: Do the math
To decide how much an award ticket is worth, make some calculations. If you find a particularly good airfare deal, snap it up in cash and reserve your miles for times when fewer deals are available. Taking award seats makes the most sense when the cash value of a ticket is roughly in line with its cost in miles (say, when you find a last-minute flight to a popular European city that costs $600, and you can put down 60,000 miles—or 1 cent per mile—to buy it).
