Originally Posted by xliioper

Exact same award levels/fares apply to non-stop flights. Anything involving partner metal over the Atlantic is considered a DL partner award (or at least it used to be) as in the return flights above which has AF metal over Atlantic. Finding bucket availability on KL non-stops can be more challenging (they are also less than daily until mid-March), but there are examples below.

DL formerly had different award levels for it's own metal vs. partner metal over the Atlantic. They still had 3 tiers for partner awards (for 0- 20 day advance purchase, 21 - 59 advance, and 60 day or more advance purchase), but all partner awards still priced as one-way awards and the award levels were generally much cheaper than DL one-way awards. The have now harmonized the DL/partner metal award levels to/from US/Canada to be the same and cheapest award levels will require a roundtrip purchase whether flying DL or partner metal over the Atlantic.