I would like to take part in the stopover offers by varies airlines on my way from SFO to London in Sept.
It appears that I need to purchase the fair on airline web site as opposed to Chase Travel.
If I do, can I pay with points - I recall some purchases, chase doesn't allow.

Is the fare really cheaper to buy through the airlines stop over deals?
On the return, it might require me to fly via their city again. If so, I might consider another town - say TAP airlines.
I am also interested in seeing Denmark - unsure if it is possible!

Tips, workaround? Thanks