Is it cheaper to get married abroad?
Possibly, because you can get good package deals, but you have obviously got the additional travel costs.
It can be a good way to stick to your budget, because most things will be included in the package. So you will only need to add on clothes, travel, and personal touches.
Guests will obviously incur larger costs, than a UK wedding because they will have to pay for flights and hotels. It is your day, and your choice, but if there are key guests you want to celebrate with then you need to be sure they are happy to pay the necessary additional costs.
The wedding would usually lead straight into the honeymoon, but be prepared that guests will stay on too, so you may have to share your honeymoon.