Hi, We cruised Princess in/out of Southhampton this summer. We had a 9 a.m. pickup from British Express Cars (you can easily search for them) and had smooth sailing into our hotel in the city. If you tried for pickup at 7:30, you should be able to get to the airport by 10:30, I'd think. However, if Princess offers the transfer for a flight with that time, go for it. In the past, they have a specific time flights need to leave after for them to take you, and they won't make exceptions if your flight is just a few minutes earlier, even. We were glad to have the private car service, and it wasn't that much more than the transfers. Hope this helps.