Upvote:3
No UK credit card or domestic car insurance policy will cover you for driving in US. Specialised travel insurance may include some degree of car insurance although that is unusual.
The better option (assuming that you don't have a US driving licence) is to book through one of the UK base brokers such as
www.netflights.co.uk
www.carhire3000.co.uk
www.auto-europe.co.uk
and get a package that includes all of the required insurance. This will work out way cheaper than what you'd get just turning up at the car hire desk and taking whatever insurance they offer. Depending on the location, this could also give you the option of a one-way rental without any extra fees - especially between California / Nevada / Arizona.
Upvote:4
It depends on the exact type of card.
In general, most UK credit cards do NOT cover rental car insurance. Specifically for NatWest, the only card that does is the "NatWest Black" Mastercard, so if that's what you've got then you're set - although it still helps to read the conditions of coverage so that you're 100% sure what is covered and what is not.
If you have any other sort of NatWest card then you're probably out of luck on that front, although most travel insurance policies will cover rental cars, or you can look into a packaged rate that includes CDP and/or LDW coverage, which are fairly common on European booking sites.