I'm quite new to using points and trying to figure out which would airline would be for my situation.

I currently have 66k in chase rewards. I am willing to sign up for citi to get an additional 40k that could be transferred to Singapore air. I don't think citi can be transferred to Korean Air though, but please correct me if I'm mistaken.

So I'm close to having 2 tickets paid for but I know I'll need to change my return flight since I don't know how long I'll be staying in Korea, at a minimum 6 weeks but I could stay up to 10 weeks. So I plan to book round trip tickets for 12 weeks and change if needed.

We will need 2 adult tickets and 1 child ticket.

Would it be better to do it this route or do one way tickets? I priced out one way and they are almost 2/3rds the cost of a round trip.

Also the time frame that I'll be traveling is during July, peak season. I know KAL has blackouts until June 30th, but I'm not aware of any blackouts for Singapore. These will be economy tickets, the cheapest

Any help would be appreciated. Open to other suggestions like Asiana or transferroing points to a different program.

Thanks!

Route: SFO - ICN and ICN - SFO
Time frame: July-Sept.