There is a way to embed your flow as an iFrame within a website.
First, please click on the "Integrate' tab that is available in your flow that you are willing to embed.
Then, you see the option of 'Embed in a web page', this is where you the code for the Iframe is present. You will need to add in a <iframe src> tag within the body of your HTML code, such as the below:
Copy this HTML code to your website and you will have your flow embedded to your website.