De Silvestro raced for Newman Wachs Racing's Nuclear Clean Air Energy-Entergy team in the Atlantic Championship in 2008. She won the Atlantic race at the 2008 Grand Prix of Long Beach, becoming the second woman to win in that series after Katherine Legge. In 2009, she raced for Team Stargate Worlds and won four times, leading in points for most of the season before finishing third overall. De Silvestro participated in an IndyCar Series test in December 2009 at Sebring International Raceway, a joint effort between HVM Racing and Team Stargate Worlds.
De Silvestro competed full-time in the IndyCar Series for HVM Racing in 2010. She qualified 22nd for the 2010 Indianapolis 500 and finished 14th, earning Indianapolis 500 Rookie of the Year honors. She suffered a burned right hand after a crash at the Firestone 550 at Texas Motor Speedway in June 2010. For the season, de Silvestro started seventeen races, finished ten, and recorded two top-ten finishes, with a best finish of eighth at Mid-Ohio. She finished nineteenth overall in the series standings.
The 2011 season began with fourth- and ninth-place finishes at St. Petersburg and Barber. At the São Paulo Indy 300, an accident put her nine laps down, though she recorded the fastest lap of the race. De Silvestro received second-degree burns on her right hand during practice for the 2011 Indianapolis 500 due to a mechanical failure. She qualified 24th for the race using her backup car. After a crash at the Milwaukee Mile during qualifying, de Silvestro withdrew from the race due to dizziness and impaired vision, and was not cleared to compete at the next race in Iowa. She finished twentieth overall in the 2011 series standings.
De Silvestro returned to HVM Racing for the 2012 IndyCar Series season, piloting the No. 78 Dallara-Lotus. The Lotus engine proved to be significantly underpowered compared to the Chevrolet and Honda engines used by other teams, leading to consistently poor results. The car was black-flagged on several occasions for failing to maintain the minimum safe speed, including at the 2012 Indianapolis 500. She finished 24th overall in the series standings.
On 30 October 2012, de Silvestro signed with KV Racing Technology for the 2013 IndyCar Series season, driving the No. 78 Dallara-Chevrolet. At the Grand Prix of Houston on 5 October 2013, she finished second for her first podium finish, joining Danica Patrick and Sarah Fisher as the only women in IndyCar history to record a podium finish. On 2 April 2015, de Silvestro announced she would drive the Andretti Autosport No. 29 Honda in the 2015 IndyCar Series season. She finished fourth in the second race of the season, the Indy Grand Prix of Louisiana. On 19 January 2021, Paretta Autosport announced de Silvestro as their driver for the 2021 Indianapolis 500.
In February 2014, Formula One team Sauber announced that de Silvestro would join as an "affiliated driver" with the objective of racing in 2015. She began testing with the team at Fiorano Circuit in April 2014, completing 112 laps in the 2012 Sauber car. However, in October 2014, Sauber team principal Monisha Kaltenborn stated that de Silvestro's driving chances had been suspended due to contractual troubles.
On 15 June 2015, it was announced de Silvestro would drive for Andretti's Formula E team at the championship's finale in London. She was confirmed full-time for the 2015-16 season alongside Robin Frijns. In 2016, de Silvestro became the first female driver to score points in Formula E with a ninth place in the 2016 Long Beach ePrix. She finished the championship in eighteenth place with four points. De Silvestro returned to the driving seat for Venturi Racing at the December 2018 Ad Diriyah test, placing tenth overall and fastest of all female drivers. Between 2019 and 2023, de Silvestro served as Porsche's reserve driver. In 2024, she participated in the all-female pre-season test at Circuito del Jarama, joining new team Kiro Race Co.
On 19 August 2015, it was announced that de Silvestro would partner Renee Gracie at Prodrive Racing Australia in the Bathurst 1000 for V8 Supercars. The car finished 21st after extensive repairs. On 5 September 2016, de Silvestro signed a three-year contract as a full-time driver for Nissan Motorsport in the Australian Supercars Championship, starting from the 2017 season. She made another appearance at Bathurst alongside Gracie with the Nissan squad, finishing 14th. De Silvestro suffered a tumultuous debut season in 2017, finishing as the lowest-classified driver in the standings to complete every event. She improved to 23rd in the overall standings in 2018, claiming her first top-ten finish in Newcastle. De Silvestro remained with Kelly Racing for 2019, picking up a best result of 7th in New Zealand. She confirmed her exit from the championship prior to the penultimate round at Sandown, finishing the season 19th in the standings. De Silvestro made a cameo appearance in the 2023 Bathurst 1000 as a wildcard entry for Dick Johnson Racing, finishing 20th.
In 2020, de Silvestro returned to Europe as a factory Porsche GT driver, contesting the 2020 ADAC GT Masters for Timo Bernhard's Team75 with Klaus Bachler. She finished 23rd in the championship with 41 points. The duo switched to Herberth Motorsport for the 2021 ADAC GT Masters.
In early 2022, De Silvestro announced that she had started training in bobsleigh, with a goal to compete for Italy at the 2026 Winter Olympics in monobob. Her first competitive event was the 2022 Swiss championships where she placed fifth. De Silvestro qualified for both the monobob and two-person disciplines through her results in the 2025–26 Bobsleigh World Cup, finishing 23rd overall in both.
De Silvestro is of Italian descent through her father and holds dual Swiss and Italian citizenship.
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