WAS-NBO (Nairobi) on UA/star $2399 pp in Biz
Just booked the end of August to mid-September. Was working on mileage awards when I stumbled on low fares. Also $3500 or so on AA/BA, which is good but not $2400 good. Great time to go see the Great Migration!
I did not check other routes, but I did look at returning from DAR and it took it up to $3100 per person so still pretty good.
I booked on United.com
Enjoy!