Loyalist Travel| Hotel | Program | Got an upgrade |
|---|---|---|
| Numo Ierapetra Beach Resort Crete, Curio Collection by HiltonCurio Collection by Hilton · Heraklion, Greece | Hilton Honors | Not enough stays yet |
| O by Myconian, Mykonos, a Member of Design Hotels™Design Hotels · Mykonos, Greece | Marriott Bonvoy | Not enough stays yet |
| ORA Hotel Priorat, a Member of Design Hotels™Design Hotels · Torroja del Priorat, Spain | Marriott Bonvoy | Not enough stays yet |
| Oakland Marriott City CenterMarriott Hotels · Oakland, California | Marriott Bonvoy | Not enough stays yet |
| Odera, Tinos, Autograph CollectionAutograph Collection · Mykonos, Greece | Marriott Bonvoy | Not enough stays yet |
| Odessa Marriott Hotel & Conference CenterMarriott Hotels · Odessa, Texas | Marriott Bonvoy | Not enough stays yet |
| Old Town Chambers, Autograph CollectionAutograph Collection · Edinburgh, United Kingdom | Marriott Bonvoy | Not enough stays yet |
| Olea All Suite Hotel, a Member of Design Hotels™Design Hotels · Zakynthos, Greece | Marriott Bonvoy | Not enough stays yet |
| One Washington Circle DC, Tapestry Collection by HiltonTapestry Collection by Hilton · Washington, D.C. | Hilton Honors | Not enough stays yet |
| Onyria Marinha CascaisVignette Collection · Lisbon, Portugal | IHG One Rewards | Not enough stays yet |
| Onyria Quinta da Marinha HotelKimpton · Lisbon, Portugal | IHG One Rewards | Not enough stays yet |
| Opatija Marriott Resort & SpaMarriott Hotels · Rijeka, Croatia · Club lounge | Marriott Bonvoy | Not enough stays yet |
| Orlando Marriott Lake MaryMarriott Hotels · Orlando, Florida | Marriott Bonvoy | Not enough stays yet |
| Ortea Palace Hotel, Sicily, Autograph CollectionAutograph Collection · Sicily, Italy | Marriott Bonvoy | Not enough stays yet |
| Osaka Marriott Miyako HotelMarriott Hotels · Osaka, Japan · Club lounge | Marriott Bonvoy | Not enough stays yet |
| Oshkosh Marriott Waterfront Hotel & Convention CenterMarriott Hotels · Oshkosh, Wisconsin | Marriott Bonvoy | Not enough stays yet |
| Ottawa Marriott HotelMarriott Hotels · Ottawa, Canada | Marriott Bonvoy | Not enough stays yet |
| Palace Hotel, a Luxury Collection Hotel, San FranciscoThe Luxury Collection · San Francisco, California | Marriott Bonvoy | Not enough stays yet |
| Palacio Provincial San Juan, Curio Collection by HiltonCurio Collection by Hilton · San Juan, Puerto Rico | Hilton Honors | Not enough stays yet |
| Palacio Santa Clara, Autograph CollectionAutograph Collection · Valencia, Spain | Marriott Bonvoy | Not enough stays yet |
| Palacio Tondon, Autograph CollectionAutograph Collection · Logroño, Spain | Marriott Bonvoy | Not enough stays yet |
| Palacio de Godoy Caceres, Curio Collection by HiltonCurio Collection by Hilton · Cáceres, Spain | Hilton Honors | Not enough stays yet |
| Palazzo Donizetti Istanbul, Tapestry Collection by HiltonTapestry Collection by Hilton · Istanbul, Turkey | Hilton Honors | Not enough stays yet |
| Palazzo Velabro, a Member of Design Hotels™Design Hotels · Rome, Italy | Marriott Bonvoy | Not enough stays yet |
Got an upgrade is the share of stays that got any room upgrade, out of those that said, with recent stays counting more. It shows once 3 stays have said; until then, a dash.