Air France operates a daily nonstop ORD–CDG, and that flight is the backbone of the best award redemption out of Chicago. Book it through Air France Flying Blue at approximately 65,000 miles one way in business class — and sometimes less during their monthly Promo Rewards sales, which have historically dropped this specific route to as low as 50,000 miles. Flying Blue is a dynamic program, meaning prices move, but the ORD–CDG nonstop is one of the more consistent values in the program. The hard product on Air France's 777 is genuine business class — lie-flat, direct aisle access — not the recliner-in-nice-clothes that gets passed off as premium on shorter hauls.
If Flying Blue inventory is thin, the second play: Delta One on the ORD–CDG codeshare, bookable through Virgin Atlantic Flying Club at 50,000 points one way — still one of the last fixed-rate redemptions standing after years of devaluation across every other program. Virgin Atlantic transfers from Chase Ultimate Rewards, Amex Membership Rewards, Capital One, and Citi at 1:1, meaning a single strong welcome bonus covers two business-class seats to Paris with points left over. British Airways Avios via Iberia can also work for connecting itineraries through Heathrow if the nonstop is sold out in points space.
For building the points, the Chase Sapphire Reserve and the Amex Platinum are both doing the necessary work here — each transfers 1:1 to Flying Blue and Virgin Atlantic. The Reserve's 3x on travel and dining means anyone eating seriously in Chicago is quietly accumulating Paris business class without a spreadsheet. Amex runs transfer bonuses to Flying Blue a few times a year; catch one, and a single welcome offer becomes 75,000–80,000 miles.