Consiglio del giorno che ti può essere utile:
Prices normally go up on sites (mainly travel) if theres a lot of traffic on the page. You can overcome this by only visiting with a VPN, a different browser or clearing your cookies.
Even better is only go when you're ready to book. If a group of you are planning to go somewhere get one to book for the group.
As little as 10 visits by the same person can cause the price to increase.
How do I know this?. Customers ask me to implement this functionality.
Edit: Mainly low cost budget airlines.