I'm looking at a couple of flights BKK-AMS in late April/early May. I do not usually fly KLM, so I'm not familiar with their site or tools but have a lot of Chase miles. I did a check and found that on one date in May, upgrades are available for 21,000. The dates I checked in April were 74,000.

Is there a way for me to see a calendar of dates for upgrades so I can try and book on a 21k day? There did not seem to be a way to look at multiple dates or even try another date without starting the entire search over.

Also, what would the odds of a paid upgrade be for this route? Is BKK-AMS usually busy?

Thank you!