I am traveling from London to Malaga, Spain in mid-September. I am looking for advice on what airport to fly out of in London. I would like to book the flight from an airport with easy access to Kensington where I am staying in London. I see there are flights from Gatwick, Stansted, and Gatwick. I will have a suitcase and, therefore, would most likely take a cab/uber to the airport. I appreciated any suggestions. That you in advance.
Heathrow is my preferred London airport when staying in Kensington. If you're staying at the Marriott, the tube to Heathrow takes 40 minutes, is cheap, and there is an elevator at Earl's Court tube station (many tube stations only have stair access). An Uber ride will usually be 25-35 minutes as you'll avoid much of the congestion crossing London.
I don't think there are flights to Malaga, but BA flies between Heathrow and Gibraltar, which is just over an hour's drive to the Marriott timeshares. The flight and car rental will probably be more expensive than flying from Gatwick or Stansted to Malaga, but getting to the airport in London will be much easier. Note that the border crossing from Gibraltar to Spain can sometimes be very congested.
Flying to Malaga, I'd pick Gatwick airport over Stansted which is too far out of London for my taste. A taxi will be very expensive, but Uber prices are quite reasonable in London. A cheaper (and possibly quicker) alternative would be Uber from Kensington to Clapham Junction station, then 25 minute train to Gatwick. All in all, that's probably the option I would choose.