If you are entitled to a free upgrade due to your Avis Preferred tier, the app has been programmed to offer this automatically. If you are wanting to redeem a voucher for a free upgrade as a reward, then you will need to follow the usual voucher redemption process when making a booking.
Don't forget to review the terms and conditions when you book, which include everything you need to know ahead of your journey.
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Already planned a trip? Check your booking.
