Is it better to fly or take the train between these countries?

For a luxury trip, fly. The train between Bangkok and Singapore (the Eastern & Oriental Express) is a unique experience but takes several days; commercial flights are far more efficient.

How do I handle currency across three countries?

Use a travel-friendly debit card like Revolut or Wise to minimize exchange fees, but keep a small amount of USD for emergency tips.

Planning a Luxury Triangle Trip: Thailand, Singapore, and Malaysia

To execute a luxury triangle route, book open-jaw flights landing in Bangkok and departing from Singapore, utilizing business-class regional flights between major hubs. Focus on 12 days total, spending 4 days in each country to balance high-end city stays with coastal or cultural retreats.

Book Open-Jaw Flights. Book a multi-city ticket: Arrive in Bangkok (BKK) and depart from Singapore (SIN). This avoids backtracking and saves at least 8 hours of travel time.
Select Regional Carriers. Use Singapore Airlines or Thai Airways for the inter-country legs. They offer the most reliable business class and lounge access for these short 1-2 hour hops.
Secure Private Transfers. In Bangkok and Kuala Lumpur, pre-book private chauffeur services through your hotel concierge rather than relying on standard ride-shares. It ensures seamless navigation of high-traffic areas.
Align Luxury Property Booking. Book hotels that offer 'club level' access. In Singapore and Bangkok, this provides guaranteed lounge access, free-flow evening cocktails, and private check-in, which offsets the cost of dining out.

Is it better to fly or take the train between these countries?: For a luxury trip, fly. The train between Bangkok and Singapore (the Eastern & Oriental Express) is a unique experience but takes several days; commercial flights are far more efficient.
How do I handle currency across three countries?: Use a travel-friendly debit card like Revolut or Wise to minimize exchange fees, but keep a small amount of USD for emergency tips.