Andretti won eight races in the 2003
Barber Formula Dodge Eastern Championship, and was champion in the Barber National and Southern class the following year. , where he finished first In 2005, Andretti raced in the
Star Mazda series and made six starts in the
Indy Pro Series. Andretti's win established him as the 2006
Bombardier Rookie of the Year.
2007 at the
2007 Indianapolis 500 The 2007 season was not as successful for Andretti. He failed to finish ten times and only completed seven races. The team struggled to find balance on ovals, with accidents eliminating him from the races in
Japan,
Indianapolis,
Milwaukee, and Chicago, as well as the Mid Ohio road course. After finishing second at Michigan, Andretti finished eleventh place overall with 350 points.
2008 Andretti ran his first night race at Homestead-Miami Speedway, the first race of the 2008 season, with a 2nd-place finish behind
Scott Dixon. He also led the most laps of the race – leading 85 – and received an additional three points. At St. Petersburg, Andretti snapped a half-shaft on his car trying to leave the pits, causing him to retire. In the third race of the season at Motegi, Japan, Andretti spun out on the first lap of the race. At the
2008 Indianapolis 500, Andretti finished third, after leading several laps. During the race, he passed teammate,
Tony Kanaan, who then crashed into the wall, blaming Andretti. A week later, Andretti captured his first IndyCar Series pole at the
Milwaukee Mile and became the youngest IndyCar pole winner at the time – at the age of – but crashed out with three laps to go in the race. His car slipped up the track, collecting
Ed Carpenter, which in turn caused
Vítor Meira to go airborne as he drove over Andretti's tire. The eventual winner,
Ryan Briscoe just missed the wreckage, as Andretti finished 21st. At
Texas Motor Speedway, Andretti had one of the best cars and was able to drive the high line all night, but
Ryan Hunter-Reay and Andretti made contact with just a few laps to go. Andretti finished third at
Iowa, and then ran a strong race at
Richmond but lost position when he pitted under green and a subsequent caution allowed the race leaders to pit under yellow; he finished ninth. Andretti finished fifth at
Watkins Glen before mechanical failure caused his car to crash out at
Nashville. He also raced earlier the same day in the
American Le Mans Series race at
Lime Rock Park. At Mid-Ohio, Andretti got caught up in a four-car wreck on a restart on lap 42 which ended his race, before a seventeenth place finish at Edmonton after contact with his teammate
Danica Patrick. At
Kentucky, Andretti took the lead from
Scott Dixon, but as the race neared its end, all drivers had to pit for more fuel and Dixon took the win, while Andretti finished third. Andretti failed to finish higher than eighth in the final three races, as he finished seventh in points.
2009 in May 2009 The 2009 season began on two
street circuits, allowing Andretti to show the benefits of his
A1 Grand Prix experience. At
St. Petersburg he tangled late in the race with veteran
Alex Tagliani, finishing thirteenth, but overcame a nineteenth place start in
Long Beach to finish 6th due to a different pitting sequence. This was Andretti's first time at Long Beach, a circuit at which both his father and grandfather won multiple times. After a sixth place finish at
Kansas. Andretti looked to
Indianapolis, where he had been second and third in two of his three starts. Starting eighth, Andretti attempted to pass
KV Racing Technology's
Mario Moraes on the outside of the South chute between turns 1 and 2. Moraes moved towards the wall, apparently unaware that Andretti was outside of him, and both cars collected the wall. Both Andretti and Moraes expressed their displeasure with each other in their on-air interviews. Andretti called the second-year driver "clueless" and said that "he doesn't get it and never will. I should have known who I was racing with." The remainder of the year did not yield much success, as Andretti's best finish of the year was fourth at
Texas. He continued his improved form on the road and street courses, finishing fifth at
Watkins Glen, eighth in his first race in
Toronto – where
his father won a record seven times – and sixth at
Mid-Ohio before finishing eighth in the final standings.
2011 and 2012 In 2011, Andretti placed ninth at
Indianapolis after starting 27th. On June 25, 2011, Andretti won his second IndyCar Series race at
Iowa Speedway. It was his first win in 79 races since his win at
Sonoma Raceway in 2006. In 2012, Andretti started the year with fourteenth place at St. Petersburg, eleventh at Alabama, 25th at Long Beach, and fourteenth at São Paulo. He led the most laps (59) at Indianapolis but hit the turn 1 wall on Lap 188. Andretti continued the season with eleventh at Detroit, seventeenth at Texas, fifteenth at Milwaukee, and a best finish of the season at Iowa, where he finished second. Following his runner-up at Iowa, he had sixteenth at Toronto, fourteenth at Edmonton, eighth at Mid-Ohio, and 25th place at Sonoma. At Baltimore, Andretti made another finish in the back of the field, finishing fourteenth. Just as the season was about to end, he achieved the second pole position of his career at Fontana, finishing the race eighth. Andretti finished sixteenth in the point standings.
2013 Andretti started the 2013 season with a third-place finish at St. Petersburg. This was followed by two seventh place finishes at Barber and Long Beach, matching his top-ten tally from the 2012 season. In the fourth race of the season at São Paulo, Andretti finished third and was able to move to second in the championship thirteen points behind
Takuma Sato. He also led his first seven laps of the season. At the Indy 500, Andretti qualified third and was consistently in the top-five throughout the race. He led 31 laps and finished fourth after two late yellow flags that prevented him from moving forward in the field. After the race, Andretti said he was "frustrated" with the finish because he had not been below fourth all race. However, after the 500 he took the points lead by eleven points over Sato. Andretti continued his season with the first doubleheader at Detroit, finishing twentieth in the first race – his lowest finish of the season – and 6th in the second race, marking improvement between the two. At Texas, he performed relatively well, staying within the top-ten for most of the race, and later finishing fifth. He claimed his third pole position at Milwaukee, but despite his success in qualifying, his engine blew after the first pit stop, leaving him with a twentieth place finish, before he finished ninth at Iowa. At Pocono, where his grandfather and father had once raced, he was at the top of his game, setting the track record for the fastest lap, and gaining a fourth career pole. Despite leading early in the race, he faded to a tenth place finish in the end. At the Toronto doubleheader, he qualified and finished in the top-ten, staying consistently well during the race. He finished fourth in race one, and finished ninth in the other race at Toronto, without any other events altering his finish. At Mid-Ohio, he finished ninth, without having many eventful occurrences throughout the race. He finished the season fifth in points.
2014 to 2017 2018 in 2019 On December 7, 2017, Andretti Autosport announced plans for Andretti to swap car numbers with teammate
Alexander Rossi for the 2018 season. Rossi would move to the No. 27 team while Andretti took over Rossi's No. 98.
2020 Following disappointing 2018 and 2019 seasons in which he failed to secure any podium finishes, Andretti qualified for the pole position at the
2020 Indianapolis 500, posting an average speed of 231.068 MPH—the first time an Andretti had sat on the pole for the Indy 500 since his grandfather Mario in 1987. The high point in his season proved short-lived, however, as he quickly faded after the race's start and ended up finishing thirteenth. Andretti would finish no higher than tenth during the
pandemic-shortened 2020 season.
IndyCar In January 2021, Andretti announced that he would "step away" from full-time IndyCar racing, though he will continue to work with the Andretti Autosport team in a testing and development role. He placed 19th in the
2021 Indianapolis 500. He finished 22nd in the
2022 Indianapolis 500, 17th in the
2023 Indianapolis 500, 25th in the
2024 Indianapolis 500 and 29th in the
2025 Indianapolis 500. On October 29, 2025, Andretti would announce his retirement from motor racing and the Indianapolis 500. ==Sponsorship==