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Virgin Atlantic and Delta are offering some superb Business Class fares from London to San Diego, starting at just £1,100 return:
The fares are wide open from November 2021 through to the end of the current booking schedule in May 2022.
The easiest way to see a wide range of dates at once is to use Google Flights:
However, you can often knock a few quid off the price by booking with an online travel agency via sites like Momondo. Given the potential complications involved with travel though these days, you may prefer to pay a bit more and book direct.
If you credited the flights to Virgin Flying Club, you should end up with a healthy rebate of about 23,000 Virgin Points. You may prefer to credit to Singapore KrisFlyer or ANA Mileage Club, where you would earn ~14,000 (potentially more valuable) miles.
These are excellent for Business Class from London to West Coast USA. The fact it is so widely available and over such a length of time is great to see.
Hat-tip: Freddo over at LL