Yesterday I thought I would try something with checking Skyscanner for flights with and without cookies.
Many people on other forums state that clearing your cookies will prevent a price increase and many say it wont.
I dont think things are as easy as that.
I suspect that Skyscanner has some sort of deal going on with the companies they list. They obviously get commision on flights booked through them but I suspect they also get a better rate of commission if they hike the prices a little.
Yesterday morning I scanned fares on Skyscanner firstly with the 'Show all' listing, and '1 stop' option
Firstly all was good rreasonable fares.
I logged off and didnt clear my cookies then 20 minutes later went back on. My departure and return dates were already there but strangely some airlines werent even listed this time. When I used the clear all and individually selected the missing companies, sure enough their flights and prices came up but why didnt they show on the first attempt??
Also, when logging back in to Skyscanner without clearing cookies some flights were increased by £25 upwards. I logged off, cleared the cookies then logged back on, using the same dates etc and sure enough the prices were back to the lower fare.
I logged off, shut the computer down then restarted just in case some cookies had been retained, doubtfull as I use Firefox and use a lot of their options as well as a Tracking blocker.
This time I logged on to Skyscanner using the Non Stop option but the same dates as previously.
Thai came up at £532 and a few Eva flights at £590.
Clicking reload a few times prices stayed the same.
I logged off then back on again without clearing the cookies. Same details as before. Thai now £596 and Eva over £700 !!
This morning Thai are back to £532
One can only assume that Skyscanner are arbitrarily raising and lowering prices as their click through's go up
But it also showed that sometimes, clearing your cookies will get a lower price if returning to Skyscanner.
I might try this with Kayak and see what they show.