If you want a cheap flight from San Juan Puerto Rico to London, you've got zero airlines to choose from.
London Gatwick is just one of the airports in London. If you're not set on a specific airport, try changing your search from London Gatwick to London to see a broader range of flights – they might be cheaper.
If you're planning on going to London during this time, you could take a look at other airport options. Or you could try to get a last-minute bargain.
