Bolt and other taxi prices prediction

[OneMoreFarang]

I plan to take a taxi like Bolt from Bangkok to Bangsaen and later on the same day back again. 

I understand that the prices vary depending on a couple of factors.

Are there any (official) predictions about the prices through the day and maybe workday or weekend.

I.e. I checked this morning about 8:20 and the Bolt standard price for above trip was 2400B. Now, 10:10, it shows 1230B.

In November I paid for that trip on a Sunday 1017B and then back 794B.

 

I am flexible with my time. I don't need to concentrate on the last 100B difference, but I prefer to pay 1200 instead of 2400.

Is there an easy way to predict when to go for a reasonable price?

[Lorry]

The whole idea of price discrimination (nowadays often a different price for every customer) is to be unpredictable and thus squeezing the last 1200 baht out of the customer. 

[Puccini]

There probably is a correlation between the estimated travel time and the price.