How we know: Sources are listed at the end. Programme mechanics are described from the cited references; specific earn rates change often, so treat any number here as an example to verify. Wildly has no affiliate relationship with any programme or issuer.
Most airline miles are not earned in the air. They are earned at the checkout, and the mechanisms are open to anyone with a loyalty account and a little discipline about routing purchases through the right door.
1. Credit cards, the big one
Airline-branded cards earn miles on every purchase and offer sign-up bonuses that can be worth more than a year of flying; Wikipedia's summary of the programmes notes that "paying expenses using an airline-sponsored credit card, even those charged to an employer, can rack up frequent flyer points" (Frequent-flyer program). The more flexible route is a bank card that earns transferable points: Chase Ultimate Rewards, for example, transfers at 1:1 to ten airline programmes including United, Air Canada Aeroplan, Air France-KLM Flying Blue, British Airways, Singapore and Virgin Atlantic (TPG, September 2026), and the Sapphire Preferred earns 3x on dining and 2x on travel (Chase). Transferable points let you decide which airline to feed when you actually need a ticket.
Rule: never carry a balance for points. Interest wipes out any mile's value many times over.
2. Shopping portals
Every major US airline runs an online shopping portal. United's MileagePlus Shopping, for instance, lets members "shop online and earn award miles" by clicking through to partner retailers before buying (MileagePlus Shopping). The retailer pays the airline a commission and the airline passes some of it to you as miles, on top of whatever your credit card earns. Rates vary by retailer and change with promotions; a browser extension from the portal will remind you when a store participates. For anything you were going to buy online anyway, this is free.
3. Dining programmes
Airlines also run dining networks: register a card, eat at a participating restaurant, and miles post automatically. Participation skews toward independent restaurants in large cities. Register once and forget about it; the miles are a bonus, not a reason to choose a restaurant.
4. Hotels, cars and other partners
Loyalty programmes let members earn through "spending money at associated retail outlets, car hire companies, hotels, or other associated businesses" (Frequent-flyer program). Most hotel programmes let you choose airline miles instead of hotel points on a stay; car-rental firms credit miles per rental; some utilities, wine clubs, survey panels and even real-estate services have airline partnerships. Individually small, collectively steady.
5. Bonuses and promotions
Airlines and issuers run targeted promotions: extra miles for a first portal purchase, transfer bonuses from a bank programme to an airline, shopping-portal multipliers around the holidays. Sign up for the programme's emails, check the promotions page before a big purchase, and take bonuses only when they fit a redemption you already have in mind.
What to avoid
- Manufactured spending schemes. Buying cash-equivalents to earn points invites account closures and rarely pays after fees.
- Hoarding. Programmes can change terms and prices at will; the contract language allows changes "even if the changes affect the value of ... rewards already accumulated" (Frequent-flyer program). Earn with a redemption in mind and use the miles.
- Expiry. Some programmes still expire miles after inactivity; a single portal purchase resets the clock.
- Overpaying for the mile. A portal bonus does not make an expensive product cheap.
Putting it together
Route everyday spend through one transferable-points card, click through a portal for online purchases, register your cards for dining, and choose airline miles on hotel stays when you do not value the hotel points. Then, when you need a ticket, compare the award price with the cash fare on the route page, for example JFK to London, Chicago to Frankfurt or SFO to Tokyo Haneda; if the cash fare is on sale, a price alert will catch it and your miles keep their value for a better use. See how to redeem points for flights.
FAQ
What is the fastest way to earn airline miles without flying? A credit-card sign-up bonus, followed by routing everyday spending through the card and shopping portals.
Do airline miles expire? Some programmes expire them after a period of inactivity; any earning activity, including a portal purchase, usually resets the clock.
Are shopping portals worth it? For purchases you were making anyway, yes; the miles are free on top of your card's earnings.