Maybe asking the impossible.
Trying to go to the USA around the 30th July for 10 days. Flexible 2 days each way. My ideal was to go to LAX or SFO and back, but now just getting to ORD or MIA would be good.
Trouble is I've left it late and there are four of us wanting to fly in C.
and you didn't say from where you want to fly
and you didn't say from where you want to fly

Slight error!!
LHR or LGW