Firstly, many thanks for reading this -- I greatly appreciate it.

Do any FTers have experience of upgrading Swiss revenue flights from economy to J paying cash? More specifically, would anyone know if there is a tried-and-trusted pattern for the price volatility of such upgrades, with particular emphasis on close-in upgrades, i.e. from roughly 2 weeks out up until the date of departure?

I ask simply as the price of a one-way upgrade from LHR-ZRH had been GBP 71.00 for several weeks. Then, about five days ago, it went up to GBP 85.00. Then, until today, for the last two days it had shot up to GBP 117.00. Today it is back to GBP 85.00. For clarity, my departure is in 9 days' time.

As a result, I just wondered whether there might be a reliable pattern when it comes to Swiss upgrades and whether the cheapest £71.00 upgrade cost might return, say, within 48 hours of departure or something like that?

Any guidance would be much appreciated!

Thank you.