Heads up, Award Trailblazers! United's MileagePlus shopping portal is offering a quick and easy way to snag up to 500 bonus miles. Basically, you earn these miles on top of the usual miles you get for shopping through their portal at your favorite online stores. This promo is only running for a few days, so don't wait. While 500 miles might not seem like a ton, every little bit helps boost your MileagePlus account towards your next award flight. Plus, shopping portals are an easy way to earn miles on purchases you were already planning to make! Keep an eye out, because United isn't the only airline that runs these promos. We expect to see similar deals pop up from other airlines' shopping portals soon, so it's a good idea to check your favorite programs to maximize your miles earning!