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It's usually at least 3-4x, not double. On some routes, it's even up to 10x.

Also, here as a couple, you might have this just for 50% more (booking 3 seats instead of 2; assuming price per seat is the same)

Yeah First class on Chicago to Bismarck might be 2x but JFK to Heathrow is an easy 10x

You just need to look for flight sales (like you would for an economy ticket).

Example:

JFK to FRA, business class, A380 lie flat: $1,996USD

That’s only a 2.3x multiple of the $875 economy fare.

Norwegian is ~$200 single New York - London