Flying can be quicker than driving, so you can go further. However, in the US, flying is usually more expensive than driving. It comes down to time vs. money.
In Europe, we not only found flights to be the quickest way, but also the cheapest way to travel. We’re seriously being ripped off in the US, but I digress.
When flying, we use the same time allowances as driving. However, we deduct 3 hours for the airport hassle factor (driving there, parking, security, boarding, waiting, baggage).
This means, if we had 7 days for a trip, we would look for a flight time of 9 hours or less, including layovers (12-hour journey allowance, less the 3 hours in the airport).
Don’t forget to consider time zone differences, especially if there are multiple. Though the time balances out on the return, don’t underestimate jet lag ruining a day or two.
You can create a flight radius map on Google Flights by limiting the duration of the flight in the filters.