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Yes, Your OneKeyCash expires if you have not made a booking or completed a redemption for 18 months. Per the Hotels.com and Vrbo terms and conditions pages:
“Base and Preferred Inventory OneKeyCash will not expire as long as you have made an Eligible Booking or redeemed a Redemption Reward through a Participating Brand on your Account at least once in the preceding eighteen (18) months. If there has been no such activity, all accumulated Base and Promotional OneKeyCash and Trip Elements in your Account will expire and will not be reinstated.”
One thing to remember is that promotional OneKeyCash may have a different expiration deadline. These deadlines will be specified in the promotion in which the OneKeyCash is earned. Also, once expired, your OneKeyCash cannot be reinstated.
OneKeyCash is the currency of the new combined rewards program of Expedia, Hotels.com, and Vrbo. Here's how you can earn OneKeyCash and then ensure it doesn't expire.
Related: Hotels.com Ending Its Stay 10 Get 1 Free Rewards Program, Replacing With Much Worse One Key
Activity to Extend Your OneKeyCash Validity

You can reset your OneKeyCash validity by making one of the following booking types with a brand member (Vrbo, Expedia, and Hotels.com):
- Hotel stays
- Vacation Packages
- Cruises
- Flights and/or car rental
- Eligible activity or package
- Accommodation rental
Additionally, you'll reset your OneKeyCash so it won't expire if you make a redemption for one of the following:
- Flight redemptions
- Hotel redemption at participating brands
- Short-term rental redemptions
- Car rental, including insurance redemptions
- Eligible activities and insurance
Our Take
While 18 months of validity is not the most generous term, it is still better than nothing. And it's more than enough time to take some action to keep you balanced alive. However, the only major issue with OneKeyCash is that you can have varied validity depending on whether you earned your OneKeyCash via a promotion or a standard booking.
In this case, your best option is to track your One Key Rewards with AwardWallet to stay on top of your various OneKeyCash validity deadlines. The app will let you know in a timely manner when you have cash about to expire.
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