Refund

Yes, I just cancelled a tour and the single supplement was refunded, too.

Kathy, this forum consists of travelers like you who share knowledge and experiences. You should send your question directly to Rick Steves Europe for a definitive answer.

Here is what the Tour Conditions states regarding single supplement refunds:

https://www.ricksteves.com/tours/tour-conditions

Single supplements are refundable if cancelled at least 60 days prior to tour departure; those cancelled later will be forfeited, unless you booked a tour less than 67 days before its departure date, in which case, the single supplement becomes non-refundable after 7 days, but may be creditable in the case of a Creditable Event, as outlined below.