Airline shopping portals, explained

If you collect airline miles, there's a good chance the easiest miles you'll ever earn come from shopping you were going to do anyway. Nearly every US airline runs a shopping portal - a directory of online stores you click through before you buy, which then pays you miles for the purchase. This guide covers what they are, how to read their rates, and the one thing almost nobody tells you: a lot of them are the same store underneath.

What an airline shopping portal actually is

It's an affiliate storefront wearing an airline's colors: a shop window that earns a cut for sending you somewhere else to buy. The airline (really, a partner that runs the portal for them) has that arrangement with thousands of retailers. When you start at the portal, click through to a store, and buy, the store pays the portal a commission, its cut for sending the customer, and the portal hands you part of that back as miles in your frequent-flyer account instead of cash. Any term here you haven't met before is in the glossary.

That's the whole trick. You're not getting a discount; you're getting miles funded by the retailer's marketing budget, on top of everything else you'd normally earn.

Why the rate is "miles per dollar," not a percentage

Cashback sites quote a percentage because they pay you cash. Airline portals quote miles per dollar - 2 mi/$, 4 mi/$, sometimes more - because they pay you miles, not cash. A store showing 4 mi/$ pays exactly that: four miles for every dollar you spend, so a $100 order earns 400 miles. There's no percentage to translate.

Whether that's a good deal depends entirely on what a mile is worth to you, and that's a personal number - a Southwest point and an Emirates mile are not the same thing, and neither is worth a fixed cent. We never quietly convert miles to dollars for you; when we show a cents-per-point assumption anywhere on the site, it's a slider you control, not a fact.

Here's one store's airline-portal rates side by side, live:

The part nobody mentions: a few platforms, a lot of logos

Click through United's portal, then American's, then Delta's. The layout feels familiar. The store list feels familiar. That's not déjà vu. Those three, plus Southwest and Alaska, all run on one shared white-label platform: one company builds the storefront, and each airline licenses it, paints it their color, and plugs in their own miles.

The version of this you usually hear is that every airline portal runs on that one platform. It doesn't, and the difference matters. Of the airline portals we track, a second group runs on a different shared platform: JetBlue, plus international programs like Flying Blue, Emirates Skywards, Asia Miles and Virgin Atlantic. One more runs on a platform of its own: Aeroplan's eStore.

So the honest picture is a handful of shared platforms rather than one, and that has two real consequences:

• Portals built on the same platform carry almost the same list of stores. If a store is on United's portal, it's very likely on American's and Delta's too, because all three are reading from one catalog. Across platforms that stops being a safe bet: a store you found on the American/United/Delta group may or may not be on JetBlue's or Flying Blue's.
• The rates and the miles still differ. Same platform does not mean same numbers. Each airline sets its own rate for each store and pays in its own currency. The question that matters is "which portal pays the most miles I actually value today?" - and that changes store by store, day by day.

Because we track 42 portals in one place, you don't have to open a dozen tabs to answer that. Across the major airline portals, here's how one store's rate has moved lately:

Miles or cash? A quick way to decide

For any given purchase you can usually earn either miles (through an airline portal) or cash (through a cashback portal). A rough, honest way to choose:

• Take the cash when you don't have a near-term use for the miles, or when the cash rate is clearly generous. Cash is flexible and never devalues overnight.
• Take the miles when you're saving toward a specific award and value those miles above what you'd pay to buy them. Remember that an airline can devalue its miles at any time, meaning it quietly raises the number of miles an award costs, and cash can't be repriced that way.

There's no universal winner. That's exactly why we show both in native units, miles as miles and points as points, never silently converted into dollars, and let you judge. If you want the mechanics of how cashback tracking works before you rely on it, read when cashback doesn't track; if portals are new to you, start with cashback portals 101. The shorter blog version of this platform story, with the same map, is here.