100,000 expired miles is roughly $1,000 to $1,700 in flight value, gone. The portal purchase that would have prevented it costs about $5. Here's the full math, by airline and by balance size.
Based on independent cents-per-mile valuations from The Points Guy and NerdWallet (2024).
| Balance | Delta (1.2¢) | AAdvantage (1.6¢) | Alaska (1.8¢) |
|---|---|---|---|
| 10,000 miles | $120 | $160 | $180 |
| 25,000 miles | $300 | $400 | $450 |
| 50,000 miles | $600 | $800 | $900 |
| 100,000 miles | $1,200 | $1,600 | $1,800 |
| 250,000 miles | $3,000 | $4,000 | $4,500 |
Delta SkyMiles do not expire, but the valuation is shown for comparison. AAdvantage and Alaska are inactivity-based and earn-based programs, where the full balance is at risk once the clock runs out.
The same 50,000-mile balance can be protected three different ways, and the cost spread is enormous. The reminder is what determines which column you end up in.
| What you do | Approx. cost | Outcome |
|---|---|---|
| Reset the clock with a $5 portal purchase | $5–10 | Balance preserved, expiration extended 18-36 months |
| Realize 30 days late, reinstate via the airline | $50–400+ | Balance recovered, expensive lesson |
| Don't notice for 24+ months past expiration | $600–1,800+ | Full balance lost, no reinstatement available |
Reinstatement window varies by airline. American Airlines allows up to 24 months, British Airways up to 36 months, several others have no reinstatement option at all.
A reminder costs nothing. The miles it protects don't.
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Translating cents-per-mile to flights: 100,000 miles is enough for several round-trip domestic tickets, or a long-haul international trip. The exact redemption depends on the program and the route, but the value is concrete, not theoretical.
Letting that balance expire is functionally the same as throwing away $1,200 to $1,800 in plane tickets. Said that way, the maintenance work to keep the account active starts sounding very reasonable.
IdeaWorksCompany and Bond Brand Loyalty have estimated the total value of unused or expired loyalty currency in the U.S. at over $48 billion. Not all of that is expired miles, but a meaningful share is. The reason airlines and hotels run loyalty programs is precisely because most members under-redeem.
Programs that expire miles are designed to clean up inactive balances on the airline's own schedule, not yours. The 18-to-36-month inactivity window is long enough that most people forget the account exists, then never come back to it. That's the mechanic that makes loyalty programs profitable.
The countermeasure is trivial: a reminder, set once, that fires before the deadline.
A free reminder set 60 to 90 days before your expiration date is the entire defense system. When the email lands, you do one of the cheap clock-resetting actions covered in how to keep miles from expiring, and your balance is safe for another full cycle.
For the lookup steps and which programs even need watching, see how to check when your miles expire and the airline miles expiration policies chart. For the broader strategy, the main reminder guide ties it all together.
Independent valuations from The Points Guy and NerdWallet put most U.S. airline miles between 1.0 and 1.7 cents each. Delta SkyMiles tend to come in around 1.2 cents, American AAdvantage around 1.6 cents, and Alaska Mileage Plan among the most valuable at roughly 1.8 cents. Premium-cabin redemptions on partners often deliver more value per mile than domestic economy.
Roughly $500 to $850 in flight value, depending on the program. At American Airlines' approximate 1.6¢ valuation, 50,000 AAdvantage miles are worth around $800. At Delta's 1.2¢, 50,000 SkyMiles are worth about $600. The exact value depends on what you redeem for; long-haul business class can deliver 3-5 cents per mile.
It depends on the program and the route. Common round-trip economy redemptions in the U.S. and to Mexico run 25,000 to 35,000 miles, so 100,000 miles is typically 3 round-trips domestically. International economy is closer to 60,000 to 80,000 miles round-trip, so 100,000 miles covers one international trip with miles to spare.
Industry estimates put the value of unused or expired loyalty currency in the U.S. at over $48 billion (Bond Brand Loyalty 2023 Report, citing IdeaWorksCompany). A meaningful share of that is miles that quietly expired in inactive accounts. The exact split between expired and merely unused is hard to pin down, but the unused portion alone is enormous.
Several airlines offer reinstatement for a fee. American Airlines allows reinstatement within 24 months of expiration, with fees scaling by amount, often $50 to several hundred dollars. British Airways allows reinstatement within 36 months for a per-Avios fee. Reinstatement is almost always cheaper than the value of the recovered miles, but vastly more expensive than a $5 portal purchase done in time.
Yes, as long as you have a system to keep them active. The cost of running one qualifying activity per inactivity cycle is usually under $10. The reward is preserving miles that may be worth hundreds or thousands of dollars. The trick is having a reminder so the maintenance step actually happens.
Set the reminder once. When it fires, do the $5 portal purchase. Your miles stay yours, and you avoid the four-figure regret.
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