Low-cost airline Frenchbee offers cheap return flights this autumn from Paris, France to San Francisco, United States. Prices can go as low as $292! That works out to a cost of just about 2.63 Cents (Pence) Per Mile flown.
The fare only includes carry-on luggage, so you will need to pay extra if you want to check-in bags. The price for adding checked luggage is of €35 / $40 per direction.
The great offers seem to extend through January – February 2021. Here is a sample itinerary in early November (Nov 4 – Nov 14):