- Abercrombie & Kent
- African Travel
- Avanti Destinations
- Central Holidays
- CIE Tours International
- Club Med+
- Club Med Cancun Yucatan
- Club Med Columbus Isle
- Club Med Ixtapa Pacific
- Club Med Les Arcs Panorama
- Club Med Miches Playa Esmeralda
- Club Med Punta Cana
- Club Med Sandpiper Bay
- Club Med Turkoise
- Club Med Valmorel
- Club Med Val Thorens
- Collette
- Cosmos
- Costsaver
- Delta Vacations
- Europe Express
- G Adventures
- Globus
- GOGO
- Insight Vacations
- Intrepid Travel
- Journese
- Kensington Tours
- Luxury Gold
- Micato Safaris
- Monograms
- MT Sobek
- Pleasant Holidays
- Rocky Mountaineer
- Sceptre Tours
- SITA World Tours
- Sports Empire
- Starwood Hotels and Resorts +
- Four Points +
- Four Points by Sheraton Quebec Resort
- Luxury Collection +
- The Ballantyne, Charlotte
- The Canyon Suites at The Phoenician
- The Equinox Golf Resort & Spa, Vermont
- Hacienda Puerta Campeche
- Hacienda San Jose
- Hacienda Santa Rosa
- Hacienda Temozon
- Hacienda Uayamon
- La Posada de Santa Fe
- The Phoenician, Scottsdale
- The Royal Hawaiian, a Luxury Collection Resort
- SLS Las Vegas
- Sunset Key Guest Cottages
- Le Meridien +
- Le Meridien Bora Bora
- Le Meridien Tahiti
- Sheraton Hotels +
- Sheraton Bay Point Resort
- Sheraton Bijao Beach Resort
- Sheraton Buganvilias Resort and Convention Center
- Sheraton Desert Oasis Villas, Scottsdale
- Sheraton Grand at Wild Horse Pass
- Sheraton Grand Rio Hotel & Resort
- Sheraton Hacienda del Mar Golf & Spa Resort Las Cabos
- Sheraton Kauai
- Shearton Keauhou Bay Resort & Spa
- Sheraton Lake Buena Vista Resort
- Sheraton Maui Resort & Spa
- Sheraton Mountain Vista Villas
- Sheraton Old San Juan Hotel
- Sheraton Park Hotel at the Anaheim Resort
- Sheraton Princess Kaiulani
- Sheraton Puerto Rico Hotel & Casino
- Sheraton Safari Hotel & Suites Lake Buena Vista
- Sheraton Sand Key Resort
- Sheraton Santo Domingo
- Sheraton Steamboat Resort
- Sheraton Suites Key West
- Sheraton Vistana Resort Villas, Lake Buena Vista/Orlando
- Sheraton Vistana Villages Resort Villas, I-Drive/Orlando
- Sheraton Waikiki
- Walt Disney World Dolphin
- Walt Disney World Swan
- St. Regis Hotels +
- St. Regis Aspen Resort
- St. Regis Bahia Beach
- St. Regis Bal Harbour Resort
- St. Regis Bora Bora Resort
- St. Regis Deer Valley
- St. Regis Monarch Beach
- St. Regis Punta Mita Resort
- Visitana Resorts+
- The Westin Cancun Resort & Spa
- The Westin Desert Willow Villas
- The Westin Lagunamar Ocean Resort Villas & Spa
- The Westin Los Cabos Resort Villas & Spa
- Sheraton Desert Oasis
- Sheraton Vistana Resort
- Sheraton Vistana Villages
- W Hotels +
- W Fort Lauderdale
- W Retreat & Spa - Vieques Island
- W South Beach
- Westin Hotels +
- Le Westin Resort & Spa, Tremblant
- Moana Surfrider, A Westin Resort & Spa
- Westin Bayshore, Vancouver
- Westin Bear Mountain Golf Resort & Spa, Victoria
- Westin Cape Coral Resort at Marina Village
- Westin Casuarina Resort & Spa, Grand Cayman
- Westin Dawn Beach Resort & Spa, St. Maarten
- Westin Desert Willows Villas
- Westin Golf Resort & Spa, Playa Conchal
- Westin Grand Cayman Seven Mile Beach Resort & Spa
- Westin Hilton Head Island Resort & Spa
- Westin Jekyll Island
- Westin Ka'anapali Ocean Resort Villas
- Westin Key West Resort & Marina
- Westin Kierland Resort & Spa
- Westin Kierland Resort Villas
- Westin La Paloma Resort & Spa
- Westin Lagunamar Ocean Resort
- Westin Lake Las Vegas Resort & Spa
- Westin Mammoth
- Westin Maui Resort & Spa
- Westin Mission Hills Resort & Spa
- Westin Mission Hills Resort Villas, Palm Springs
- Westin Napa Verasa
- Westin Princeville Ocean Resort Villas
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- Westin Puntacana Resort & Club
- Westin Resort & Spa, Cancun
- Westin Resort & Spa, Los Cabos
- Westin Resort & Spa, Puerto Vallarta
- Westin Resort & Spa, Whistler
- Westin Riverfront Resort & Spa, at Beaver Creek Mountain
- Westin Riverfront Resort & Spa, Avon
- Westin Savannah Harbor Golf Resort & Spa
- Westin St. John Resort & Villas
- Westin Stonebriar
- Westin Trillium House, Blue Mountain
- Swain Destinations
- Tauck
- Trafalgar
- Travel2
- Travel Impressions
- Universal Orlando
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- AmaWaterways
- Aqua Expeditions
- Avalon Waterways
- Azamara
- Carnival
- Celebrity Cruises
- Costa (only available through Tandem cruise booking engine)
- Crystal
- Cunard
- Disney Cruise Line (only available through Tandem cruise booking engine)
- Emerald Waterways
- Holland America Line
- Hurtigruten
- Lindblad Expeditions
- MSC Cruises
- Norwegian Cruise Line
- Oceania Cruises
- Paul Gauguin Cruises
- Ponant
- Princess Cruises
- Quark Expeditions
- Regent Seven Seas Cruises
- Royal Caribbean International
- Scenic Luxury Cruises & Tours
- Seabourn
- Silversea Cruises
- Star Clippers
- U by Uniworld
- Uniworld Boutique River Cruise Collection
- Viking Ocean Cruises
- Viking River Cruises
- Windstar Cruises
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