The word “free” in “flying free with miles” is doing some heavy lifting. The flights aren’t technically free. But they can cost you a fraction of what you’d pay in cash, and occasionally nothing at all, and for families where four round-trip tickets represent the majority of a vacation budget, the difference is significant enough to take seriously.
I earned my first airline miles in 2019 and didn’t know how to use them for almost two years. I thought there was a special process, a complicated phone call, a narrow window. There isn’t. But there are things worth understanding before you start accumulating, because the mistakes people make with miles are mostly made before they ever try to redeem them.
Miles vs Points: The Distinction That Matters
Airline miles live in a specific airline’s loyalty program. Delta SkyMiles, American AAdvantage, United MileagePlus. They earn and redeem within that airline’s system, including some partners. If you fly one airline regularly, these are fine.
Transferable points are more flexible. Chase Ultimate Rewards, American Express Membership Rewards, Capital One Miles – these accumulate in a central account and can be transferred to multiple airline and hotel programs. Instead of collecting United miles specifically, you’re collecting points that can become United miles, or Delta miles, or miles on a dozen other programs depending on who has the best award availability when you want to book.
For families without strong airline loyalty, transferable points are usually the better starting point. They keep your options open.
Which Card for Family Travel
The Chase Sapphire Preferred is a reasonable starting point – solid sign-up bonus (often 60,000+ points), transfers to good airline and hotel programs, and a reasonable annual fee. The Chase Sapphire Reserve is more powerful but costs more annually, and the math works out if you travel frequently enough to use its credits.
Co-branded airline cards (Delta Amex, United Explorer, etc.) make sense if you’re genuinely loyal to one carrier and fly it regularly. The perks (free checked bag, priority boarding, occasional companion certificates) have real dollar value for families who use them. They make less sense as a primary card if you don’t fly that airline consistently.
The sign-up bonus is usually the biggest single value event. A 60,000-point bonus, at conservative valuations, is worth $600-$900 toward travel. Meeting the minimum spend requirement to trigger it is the first goal. Everything after that is incremental.
The Kid Seat Question
Children under two can fly as lap infants on most domestic US flights at no cost, or for a small fee on international routes. Over two, they need their own seat, and that seat costs miles just like an adult seat. Plan for this. A family of four with two kids over two needs four award tickets, which requires considerably more points than a couple traveling alone.
The practical implication: if you have young kids, start accumulating before they turn two if possible. One window where you can get them on the plane without an extra ticket is a real financial opportunity.
How Redemption Actually Works
The simplest path: transfer your points to an airline program and book directly on the airline’s website using miles. Search the award calendar for your dates, select the flights, and pay with miles instead of cash. The process is almost identical to booking a regular ticket except the payment field shows miles instead of dollars.
Award pricing varies enormously. Economy domestic awards on major US carriers often run 12,500-25,000 miles per person one-way. Economy international awards to Europe can be 30,000-60,000 miles per person one-way, depending on the airline and route. Business class on international routes is where miles provide the most outsized value – a cash business class seat to Europe costs $3,000-$5,000 per person, while an award might cost 60,000-70,000 miles, which many people earn in a year or two of normal spending.
For families flying economy, the math is more modest but still meaningful. Four round-trip domestic tickets at 25,000 miles each is 100,000 miles. At a conservative value of 1.5 cents per mile, that’s $1,500 in ticket value. Not nothing.
The Mistakes That Make People Give Up
Letting miles expire. Most airline programs expire miles after 18-24 months of account inactivity. Any earning or redemption activity resets the clock. A small purchase on a co-branded card, a magazine subscription through the airline shopping portal, even a mileage survey – any of these counts. Set a calendar reminder if your account goes quiet for a year.
Redeeming for merchandise or gift cards. The redemption rate on non-travel rewards is usually terrible. Airlines love offering this because it’s a bad deal for you. Your miles are worth most when used for flights or hotel transfers.
Hoarding. I’ve met people with 200,000 miles who haven’t flown on points once. Miles depreciate over time as programs devalue them, and the opportunity cost of not using them is real. A good redemption now beats a theoretically perfect redemption someday.
The first time we flew somewhere on points, I kept expecting someone to tell us we’d done it wrong. Nobody did. We just got on the plane. The miles part was completely anticlimactic, which is exactly how it should be.
For the federal credit card program rules that govern miles earning, see the CFPB's credit card guides.
