Northwest Airlines sells frequent flyer miles right from its website. You can purchase a maximum of 7,500 WorldPerks miles per account per calendar year.

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Miles are available in increments of 2,500.

• 2,500 - $ 95.00 (0.038 per mile)
• 5,000 - $165.00 (0.033 per mile)
• 7,500 - $235.00 (0.031 per mile)

These prices include Federal Excise Tax and processing fee. Canadian residents will be charged additional taxes.

U.S. Airway’s website allows you to buy up to 15,000 miles per calendar year. Miles are sold in increments of 1,000 miles, with a 1,000 mile minimum purchase, for 3.5 cents per mile, a $25 processing fee, plus U.S. taxes (Canadian taxes apply to Canadian residents).

American Airlines sells its frequent flyer miles on its website as well. You can buy up to 40,000 AAdvantage miles per calendar year ranging from $27 per 1,000 miles (.025 per miles). Watch out though! They add a $30 “service charge” plus taxes to each order!

AwardTraveler.com is a great place to sell your excess miles, if you are interested in doing that. They do not sell miles but they do sell discounted tickets that they buy with the miles that other people sell to them. This is a great option if you’re looking for cheap seats and you don’t have time to rack up miles to get there.