[etothepii]

I've had the situation where two round trips are cheaper than one.

Especially if you are doing like a two day trip that looks like it might be business. E.g. LHR to JFK Mon to Wednesday.

[alexanderchr]

That’s called back-to-back ticketing and the airlines really don’t like it. You can easily get your frequent flier account closed for doing that, if not sued for the price difference.

[etothepii]

The US is weird that one would even think that's an option. I'm BA gold and have never had such a problem.