Yes, just BA from Glasgow to Gatwick. Fares would obviously depend on how far in advance you book, and duration of stay.

Low cost airlines fly from Glasgow to other London airports - such as Easyjet to Luton and Stansted.

Easyjet also fly from Edinburgh to Gatwick.

David

Alot cheaper with easyjet, from edinburgh.

As David said it depends on how far in advance you can book.
We have booked for July this year with BA and they were cheaper than Easyjet.

Good luck,
RG