Short answer — yes. Many Singapore hotels run promotions that include complimentary room upgrades or extra perks (free breakfast, F&B/SPA credits, guaranteed late checkout, airport transfer, etc.). Those perks are usually delivered via: (a) hotel loyalty / “book‑direct” benefits, (b) bank / credit‑card partnerships, (c) luxury consortia or card travel programs (AmEx Fine Hotels & Resorts, Virtuoso, Marriott STARS/Fine Hotels partners), or (d) limited-time OTA/marketing packages. Below are representative hotels and the kinds of upgrades/perks they advertise (with sources).

Hotels (examples) — what to expect and how to get it

• Shangri‑La Singapore — Shangri‑La Circle member offers and book‑direct rates give member privileges (points, member‑only rates) and member promotions frequently include upgrades or upgrade priority (subject to availability). (shangri-la.com)
• Marina Bay Sands — Sands LifeStyle membership and tourist/card promotions can include tier upgrades, resort dollars and preferential hotel benefits; Sands runs temporary “fast‑track” or tourist upgrade promotions that unlock extra privileges. (marinabaysands.com)
• Mandarin Oriental, Singapore — the hotel’s Fan Club/offer packages include complimentary breakfast, dining credit and curated experiences; third‑party packages (e.g., Klook/VIP staycation deals) sometimes include a guaranteed room upgrade as part of the package. (Upgrades vary by package and are often “guaranteed” only on specific promo deals.) (mandarinoriental.com)
• The Ritz‑Carlton, Millenia Singapore — Virtuoso / STARS / Fine Hotels partners and some hotel promo packages advertise complimentary upgrades (or upgrade on arrival), daily breakfast, and hotel credits when booked through those channels. Upgrades are typically subject to availability or tied to the booking channel. (travelsort.com)
• Capella Singapore — Capella’s packages and Virtuoso/ensemble partner offers frequently include upgrade on arrival (subject to availability), breakfast and property credits; some seasonal packages even include villa upgrades for qualifying bookings. (virtuoso.com)
• The Fullerton Hotel Singapore (examples) — from time to time the hotel runs local/member promotions that bundle complimentary breakfast and an upgrade for qualifying bookings (these are often limited‑time or member‑specific offers). (sg.everydayonsales.com)
• Parkroyal / Pan Pacific family (example of book‑direct perks) — many Singapore properties advertise “direct booking” advantages such as late checkout, dining credit or similar perks for reservations made on the hotel website. (Check each hotel’s “book direct” page.) (panpacific.com)

How to reliably get upgrades or perks

• Book through luxury consortia / card travel programs: AmEx Fine Hotels & Resorts and Virtuoso/Marriott STARS bookings include perks such as noon check‑in (when available), guaranteed 4pm checkout, daily breakfast, a hotel credit and “room upgrade upon arrival” (when available) — these often yield the most consistent extras. (americanexpress.com)
• Join the hotel loyalty program and/or book direct: many hotels prioritize members and direct bookings for upgrades, bonus amenities and points. Always sign in and use the member rate when booking. (shangri-la.com)
• Look for bank/credit‑card partnerships: local bank cards (or co‑branded card promos) sometimes give temporary elite tier upgrades or hotel credits when you pay with the promoted card. Examples include Sands LifeStyle / bank promos at Marina Bay Sands. (marinabaysands.com)
• Buy a package that explicitly guarantees an upgrade: some OTAs, staycation packages and limited promotions guarantee an upgrade in the booking terms (Klook, travel‑agent or Visa/AmEx partner deals). Read T&Cs carefully — guaranteed upgrades are usually tied to specific packages and dates. (klook.com)

Important notes

• “Upgrades” are most often “subject to availability” at check‑in unless the promotion explicitly says “guaranteed.” Always read the promotion T&Cs and confirm when booking. (americanexpress.com)
• Offers change frequently (dates, eligibility, channel restrictions). If you have specific travel dates or a specific hotel in mind I can check current promotions and availability for those dates and give direct links/steps to claim the perk.

If you’d like, tell me one or two hotels or your travel dates and I’ll look up current upgrade/perk offers and the exact booking route to get them.