Can I sell airport transfers or sightseeing tours on my portal as well as flights and hotels?

Yes, in most cases you can. A white label travel portal is not limited to flights and hotels, and transfers and sightseeing can sit alongside them as their own search and booking sections, so a customer who has just booked a room can add a car from the airport or a day tour without leaving your site.

How much choice you get depends on what you are connected to. If you have a supplier account for transfers or activities, that content flows into your portal the same way flight and hotel content does, with live prices and availability. If you do not have one yet, you can still load your own products by hand, which is what many agencies do for the tours they run themselves or buy from a local operator, and you decide the description, the price and the timings.

There are honest limits worth knowing. Coverage for transfers and tours is thinner than it is for hotels, so a busy city will have plenty to show while a smaller town may have very little. The cancellation rules come from whoever supplies the product, not from you, and some tours are sold on request, which means a person confirms the booking rather than it being instant. Whether these sections are switched on for you can also depend on your plan.

The useful thing to check next is whether you already have, or can open, a supplier account covering the destinations you sell most, and then decide which tours you would rather contract and load yourself.