Since Points.com processes the sale (not the airline), it usually won't trigger "Airlines" category bonuses on your credit card. Use a flat-rate catch-all card instead.

You can buy United MileagePlus miles directly through United's official website, but it is rarely the most cost-effective way to fly. To get the best value, you should look toward strategic credit card transfers or limited-time promotional bonuses. 🛒 Where to Buy United Miles 1. Directly from United Airlines

You don't always need to "buy" miles directly. You can buy them indirectly by earning flexible credit card points and transferring them 1:1.

You can transfer Marriott points at a 3:1 ratio. For every 60,000 Marriott points transferred, you get 10,000 bonus miles (total 30,000 United miles). ⚠️ Is it Worth It?