Originally Posted by
Mommy Points
You can transfer Freedom points to Southwest's Rapid Rewards only if you also have a card that earns Ultimate Rewards (Chase Sapphire Preferred or Chase Ink Bold). You can't go from Rapid Rewards to Chase - it's a one-way street.

Also, I can confirm that Ultimate Reward points transferred to Rapid Rewards do not count as Companion Pass qualifying points. I tried it myself yesterday. Hope that helps!
It appears that Marriott >> Southwest would count toward companion pass credit according to several posts. Marriott is also a Chase Ultimate Rewards (UR) partner at 1:3 ratio. So presumably you could do the following:
30,000 UR >> 30,000 Marriott >> 10,000 Southwest
And that would count toward the companion pass? (Any opinions on this?)
Although I value 30,000 UR pretty high, so I'm not sure this is really worth it unless you are just flush with ultimate reward points.