How are these photos got same color flavor and look so similar?

The comments to the question are well-founded, so what follows is only a hypothesis.

It may have been done in the following manner:

On location : Use of standard parameters, in particular concerning the color balance, or better, but more complex, systematic calibration of the balance on a reference test pattern (medium grey card).

Under Lightroom (or any other software allowing batch corrections)

• Homogenization e.g. by using the automatic
• adjustment function but probably also some manual adjustments Using a LUT profile

Whatever, nice work showing a very sharp mastery of both shooting and development.

Those images have one thing in common. That is the warm color tone and also the neutral whites. Take a look at this image:

Instagram

Did you ever see a gray sky like this? To achieve this look I would go to the HSL section in the develop tab in lightroom and set the saturation of cooler colors to a small value. I would not set them to 0 because then you will end up with a black & white look.

However I dont think they are all edited with only one preset. Some images share low contrast and some others have high contrast. I would try to use the black levels, contrast and saturation of certain colors to achieve some sort of flat look like this.