Heads up, mile hoarders! United's dropping a flash sale that could seriously boost your MileagePlus balance. Until November 30, 2025, you can score up to a 100% bonus when you buy miles. That means you could effectively snag miles for as little as 1.88 cents each. Why should you care? Well, if you're just a *little* short on miles for that dream vacation, this could be the perfect way to top off your account and finally book it. Think about it: that business class flight to the Maldives might suddenly be within reach! Of course, buying miles isn't always the smartest move. Do the math! Make sure the cost of buying the miles, even with the bonus, is less than what you'd pay if you just bought the ticket outright. But if you've got a specific redemption in mind and this sale bridges the gap, it's definitely worth checking out.