OTAs push flight + hotel bundles because they make more margin. We do the math both ways — bundle deals vs. cheapest flight on one platform + cheapest hotel on another — and tell you which actually wins for your trip.
For your Bangkok → Tokyo flight plus 3 nights at The Siam Heritage, splitting the booking across two platforms saves you more than any single bundle deal. Here's the math:
For each platform we calculated: base flight fare + base hotel rate − applicable membership tier discount − best stackable public promo code + checked baggage fees. Where a bundle existed (Traveloka Combo, Trip.com Flight+Hotel deal, Agoda Flight & Hotel), we applied the bundle discount in place of separate codes only when it produced a lower total.
The smart split picks the cheapest platform per side independently — so loyalty points credit to two programs instead of one, and a cancellation on one side doesn't unwind the other. The trade-off is two checkouts and two confirmation emails.
When bundles tend to win: short-haul trips under ฿15k, properties with no direct loyalty program, last-minute bookings where time matters more than ฿500. When splits win: longer/pricier trips, business travelers stacking miles + AgodaCash, anyone who already has tier status on more than one platform.