Extreme fluctuations on Swiss air from Budapest to Zurich

I just did a quick Google flights search and the difference I am seeing for the month is basically lower fares on the days the budget airlines fly (since they don’t go every day) - as opposed to Swiss Air. Sundays are high all month. But maybe I missed something.

The direct overnight option is a good option that saves both time and money. You go to bed in the evening in Switzerland and wake up the next morning in Hungary.

Or you can fly Wizzair out of Basel for under $100. The flights appear to begin at the end of May, but the June schedule isnt on the Wizzair website yet. Wait a few weeks.....

I avoid Google because I noticed a pattern of fluctuating prices. It seemed like I was being coaxed into jumping on one of their downswings. When I used other online searches, I didn't see the same fluctuations except for occasional airline specific sales.