What is the fastest way to send mail from England California in US and how much does it cost?

Royal Mail Tracked (2-4 days) is the fastest way to send mail from the UK to California, with prices starting from £15.15 for a parcel up to 1kg. It is a fully-tracked service, so you can track your item online. UPS Express is another option, with delivery in 1-3 business days, starting at £45 for a parcel up to 1kg.

For cheaper options, Royal Mail International Tracked & Signed (3-7 days) is a tracked and signed service, with prices from £9.65 for a parcel up to 2kg. Royal Mail International Standard (3-7 days) is a cheaper option, with prices from £7.95 for a parcel up to 2kg, but it is not tracked.

Please note that these prices may vary depending on the weight and size of your parcel, and additional charges may apply for parcels that are considered to be oversized or overweight.