Hi, we're landing at CPT on 5:10pm on UA 1122, and trying to get to JNB that evening.

Thinking of booking CPT-JNB on FlySafair because they have the most flights, which gives us the most flexibility in case we miss our connection. Is that smart? We won't have checked bags. Should we buy the 6:30pm flight or the 7:25pm flight?

If we miss our connection, how "flexible" will they be with flat tire rule stuff? There's also an 8:00pm and 8:50pm flight. Will they just put us on one of those, or will they try to charge us some full fare?

Thanks so much!