Luhnow, who picked up Bowa at the airport on Friday morning, would not confirm whether Bowa was a candidate for the club's full-time managerial position. Bowa described the meeting as an "exchange of baseball ideas."
Luhnow later said in a text message to MLB.com: "Larry is here to meet with me on some baseball related matters."
Bowa's visit to Houston came one day after Nationals third-base coach Bo Porter was in town to interview. Earlier in the week, the Astros interviewed Rays bench coach Dave Martinez for their managerial position, a source told MLB.com.
Martinez, 47, has been the bench coach of the Rays since 2008 and served as a Spring Training coach for manager Joe Maddon the previous two seasons. Martinez played with eight teams over 16 seasons in the Major Leagues.
As a player, Bowa was a five-time All-Star selection with the Phillies and also played for the Cubs and the Mets. A fiery personality as a player and later as a manager, he was a career .260 hitter in 16 Major League seasons, and he finished his career with 2,191 hits and won a World Series with the Phillies in 1980.
Bowa managed the Padres in 1987 and '88, and he later managed the Phillies from 2001-04. He also served as a coach with the Phillies, Angels, Mariners, Yankees and Dodgers. In six years as a manager, Bowa was 418-435 (.490) with no postseason appearances.
Bowa was named National League Manager of the Year in 2001 after the Phillies went from last place in '00 to within two games of the NL East title the next year. He was dismissed with two games remaining in the '04 season.
Bowa, 66, has been a studio analyst for MLB Network since early 2011.
The Astros began interviewing managerial candidates this week in an effort to find a full-time manager. Brad Mills was dismissed last month after nearly three years at the helm of the club, and Tony DeFrancesco has been managing the club on an interim basis.