I recommend searching for tires in 245 to see if you can find what will fit before buying the flares as not many made that are not race tires or too tall.
Again remember to look at real specs, 245/.../15/16/17 is not going to get you the correct info as tires are not measured that way.
I have already mounted 225/45/15 Hoosiers which are more like 240-245 wide on 9" wide wheels and made them fit up front with -2.5 camber, fender rolling and pulling.
In the rear with the fenders rolled and pulled as far as I could get them without resorting to body work but the 225/45/15 Toyo RA1 race tires and BFG street tires fit, barely.
Another important aspect to consider is the offset of the wheels if going to far will effect handling and add considerable wear and tear on the suspension and chassis. It also reduce the effective spring rate so stiffer springs might be needed.
There is a lot more to adding flares and having a wider wheel and tire that simply bolting parts on unless you just want it for the looks and don't care about what it actually does to the car.
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That said, in the future I might run 15x11 wheels with 275 race tires but would also rebuild the entire front suspension which likely means a tubular subframe, longer control arms and raised inner pick up points to make it work right, flares would be required of course.