Havret, runner-up to Graeme McDowell in last year's championship at Pebble Beach, was playing his first event since leaving midway through the Wales Open two weeks ago following the death of his father, who died of vascular disease.
"He was here (US Open) last year with my mother and it's obviously something special coming back here shortly after what happened," Havret told Reuters after his final round. "Being able to play some good golf was the best answer for me."
Havret struggled with emotions and his game in the opening round and registered a six-over-par 77.
But the 34-year-old Frenchman battled back to make the cut with a second-round 69, then matched par Saturday and closed on Father's Day with a strong final round that included four consecutive birdies from the sixth hole.
"I started obviously quite badly with a six over par and I carried that all week, which is a shame because my game was quite good on the whole all week long," he said.
Havret said it was difficult for him to get his game in gear when he first teed off early Thursday morning.
"The morning at 7:22 was something for me to tee up and play golf, but that's the way things are," he said. "We have to keep going and I'm sure he (his father) will be quite proud to see what I've done this weekend."
Havret said he felt good about his game with two important tournaments coming up.
"I have the French Open and the Scottish Open, and this one is done, nicely done."