Delta Award Sale, NYC to London for 22K Miles Round-trip
Delta Air Line has an unadvertised sale for flights from JFK to LHR. There’s lots of availability for just 22,000 SkyMiles round-trip.
I see availability in February, March, April, May, July, September, October, November and early December. It includes even Thanksgiving week.
You will need to pay between $170 to $200 in taxes for these award flights. The prices are for round trip main cabin.
Some good deals for travel to Europe for just 22,000 miles. There could be other routes available at discounted prices. Search deals from your city using the Flex Booking Calendar and see if you can find more deals that work for you. If you need more Delta SkyMiles you can transfer American Express Membership Rewards or Marriott points.