Retaining his seat for his 2024 campaign, Sargeant was replaced by Franco Colapinto after the Dutch Grand Prix following a series of high-profile accidents.

Sargeant later moved to Europe, where he competed in the ROK Cup International Final, Trofeo Delle Industrie, and WSK Euro Series.

[6] In the winter of 2016-17, Sargeant made his single-seater car racing debut in the Formula 4 UAE Championship with Team Motopark.

For the 2020 season, Sargeant switched to reigning Teams' Champions Prema Racing, partnering Frederik Vesti and former British F4 rival Oscar Piastri.

He scored his first FIA F3 victory in the second feature race at Silverstone, again from pole position, which promoted him into the lead of the championship.

[19] However, collisions with Clément Novalak and teammate Vesti at Monza Circuit left him with no points in either race and a grid penalty for the final round.

[21] In April, he took part in a pre-season F3 test with Charouz Racing System, who had finished last in the Teams' Championship the previous year.

In December 2021, it was announced that Sargeant would join Carlin, the team he had previously raced for in F4 and F3, to contest the 2022 Formula 2 Championship alongside Liam Lawson.

He achieved another pole position at the next round at Circuit Paul Ricard, but retired from the feature race after stalling in the pits.

In October 2021, on the weekend of the United States Grand Prix, it was announced that Sargeant had joined the Williams Driver Academy.

[29][30] He drove a Formula One car for the first time in the Yas Marina Circuit post-season test at the wheel of the Williams FW43B,[31] which he described as an "experience of a lifetime.

[37][38] He achieved the required Super Licence points at the Abu Dhabi weekend and was officially announced as a 2023 Williams race driver the following day.

He received a penalty for colliding with Bottas in the early laps, with the damage ultimately causing both cars to retire from the race.

He was later promoted to 10th after the disqualifications of Lewis Hamilton and Charles Leclerc, making Sargeant the first American driver to score a point in Formula One since Michael Andretti at the 1993 Italian Grand Prix.

He failed to set a qualifying time at the Mexico City Grand Prix and later retired from the race with a fuel pump issue.

He achieved his career best qualifying performance at the Las Vegas Grand Prix, starting sixth, but both Williams drivers dropped outside the points at the finish.

He again failed to set a qualifying time at the season-ending Abu Dhabi Grand Prix as his attempts were deleted for violating track limits.

[57] At the season opener at the Bahrain International Circuit, he qualified 18th, improved to 14th by the second lap, but finished 20th following a steering wheel issue.

He described the Chinese Grand Prix as a "massive struggle" after starting from the pit lane and finishing 17th with a penalty for a safety car infringement.

[61] He gained eight places to finish 10th in the sprint at the Miami Grand Prix, but was forced into retirement from the main race after a collision with Kevin Magnussen.

[70] Formula One returned from its summer break at the Dutch Grand Prix, at which Sargeant crashed heavily in practice,[71] forcing him to miss qualifying as the car could not be repaired in time.

Two days after the race, Sargeant was released from the team with immediate effect and was replaced by Formula 2 driver Franco Colapinto for the remainder of the 2024 season.

Vowles stated that the decision "gives Williams the best chance to compete for points" over the remaining nine races,[72] and later commented that keeping Sargeant for the second half would be "almost unfair.

[74] Sargeant raced for Iron Lynx in the GT3 class for two rounds of the 2021 Le Mans Cup, where he claimed two pole positions and two victories.

[77] In December 2024, Sargeant signed with IDEC Sport for the 2025 European Le Mans Series, alongside Jamie Chadwick and Mathys Jaubert.