That's expensive. You can fly from KUL to LGK for about 170 MYR per person return on Air Asia (plus a few MYR more if you want to check bags and grab better seats.)

Check Air Asia's website for your specific dates....it will be significantly less than 1300 MYR total.

(Edit to add: If you've never navigated Air Asia's website before, be advised that their default is to add luggage charges, travel insurance, etc. It's up to you to remove those additions if you don't want/need them. It's not difficult to do but it's easy to overlook if you aren't aware in advance.)