Farah, who overcame early problems with his drinks bottle, fell well behind Kipchoge but still registered a time of 2:06:21 to break Steve Jones's British record achieved in 1985.
After reaching halfway in 1:06:54 a year ago, Keitany passed through the corresponding point still inside world record pace at 1:07:16.
"It's so different to being on the track, it's different pain and different training but I've enjoyed it".
As Vivian Cheruiyot and Eliud Kipchoge were winning London Marathon titles thousands of kilometres away from home, Sunday, elite and upcoming athletes converged on Eldoret's Klique Restaurant along Eldoret-Nakuru highway to cheer them to victory.
Gunners fan Farah added: "Maybe next time I will get an Arsenal one".
"I was saying to the people on motorbikes to tell the staff to be a bit helpful instead of taking pictures".
'But to finish third with a personal best, a British record, on the podium, I can't do any better than that.
Still not long afterwards Farah was admitting both his satisfaction and intention to go faster, in no way doubting the marathon would be his flawless distance come Tokyo 2020.More news: Americans told to toss romaine lettuce grown over E. coli fears
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"I'm satisfied with the result. It's so far-reaching. We fully needed it and not just us - for the community and the rest of the London Fire Brigade who attended". "I can't do any better than what I did", Farah said.
"My aim is to run another marathon in the autumn and then see what happens in the summer of 2019 in Doha".
The 37-year-old, seeking a third London win after placing third in last year's race, ended his career representing Australia with victory on the Gold Coast where he carried the flag at the closing ceremony.
After nine miles Keitany and main rival Dibaba were 25 seconds ahead of Radcliffe's time. But, unlike 12 months ago when her sole pacemaker Caroline Chepkoech peeled off the course just beyond Tower Bridge, Keitany still had two pacemakers for assistance.
"I didn't want to race against anybody, I wanted to race alone".
Cheruiyot said she was chastened by her debut last year when she paid the price for an over-exuberant first half but the 34-year-old duly learned from that experience, running consistent splits of 1:08:56 and 1:09:34 to cross the finish-line on The Mall in 2:18:31, moving to fourth on the world all-time list still headed by Radcliffe's mark from 15 years ago.
Meanwhile, Great Britain's David Weir won the men's wheelchair race for an unprecedented eighth time.