In 2011, Frijns joined the Eurocup Formula Renault 2.0 championship full-time, continuing to drive for Josef Kaufman Racing.

[6] He won the title on his first attempt, winning five races over the course of the season – including both races at Silverstone – and finishing forty-five points ahead of his nearest rival, Carlos Sainz Jr. Frijns also competed in the Northern European Cup, finishing the season fourth overall, despite missing the Oschersleben, Most and Monza rounds of the championship.

[7] As in 2011, Frijns won the title on his first attempt,[8] winning races at Motorland Aragón, the Moscow Raceway and the Hungaroring, and scoring five podiums and four poles over the course of the season.

Frijns' title came amidst controversy when he was involved in a collision with rival driver Jules Bianchi in the final race of the season in Barcelona.

[14] Reflecting on Frijns' 2012 season, ESPN commentator Ben Evans opined that "anything less than a Formula One race seat next year would be a travesty".

On 24 August 2015, it was announced that Frijns would partner fellow former Sauber test driver Simona de Silvestro at Andretti for the 2015–16 Formula E season.

He took his first podium for the team at the Marrakesh E-Prix, coming very close to overtaking Mahindra Racing's Jérome d'Ambrosio, but ultimately finishing second.

A forgettable weekend came next in Mexico City, starting 20th, after both Envision Virgin Racing cars hit problems in qualifying, battling his way up to 11th.

For the Paris ePrix, Frijns started from 3rd on the grid, behind Buemi and Rowland, but when both drivers hit trouble, he took the lead and dominated in tricky conditions, mastering torrential rain and hailstones.

André Lotterer closed in on Frijns, who had a damaged front wing, towards the end of the race, but the Dutch driver did enough to hold on and win the ePrix.

At the next race in Monaco, Frijns had started towards the back of the grid, but made several overtakes, most notably one on Alex Lynn at Tabac, to get him into a top 10 position.

During qualifying at the next race at Santiago, Frijns spun spectacularly whilst on his fast lap & consigned himself to the back of the grid.

He returned to form at Mexico City & was running high up in the points & in podium contention until he was wiped out by the Mercedes EQ car of Nyck de Vries who was using Fanboost to attack Antonio Felix Da Costa.

[22] The season started at Mexico City, where, having qualified 20th, Frijns was involved in a collision with Norman Nato on the opening lap, which ended up breaking the Dutchman's left wrist and forced him to undergo surgery shortly after.

[23] As a result, Frijns missed the next round at Diriyah, held two weeks after Mexico, and was replaced by Kelvin van der Linde.

However, his breakthrough came when Frijns shockingly claimed pole under wet conditions, forming an ABT Cupra 1-2 alongside teammate Müller.

[40] For the 2023–24 season, Frijns returned to the defending champion Envision Racing, partnering Sébastien Buemi and replacing the outgoing Nick Cassidy.

[43] Despite missing the opening round at Nogaro after Frijns crashed the car in qualifying, the team bounced back with a pair of double victories at Brands Hatch and Zolder.

[44][45][46] Another victory came in the Algarve, helping Frijns to finish second in the Sprint Series standings, losing out to the pairing of Vincent Abril and Maximilian Buhk during the final round.

[47] In the Endurance Series, a pair of podiums at the start of the campaign put Frijns into the championship battle, though scoring no points from the 24 Hours of Spa would destroy any title hopes.

[54] On 29 January 2018, it was announced that Frijns will drive for Audi Sport in the Deutsche Tourenwagen Masters, replacing Mattias Ekström, who elected to focus solely on the FIA World Rallycross Championship.

[55] Frijns partnered Nico Müller for the 2019 season at Audi Sport Team Abt Sportsline & finished 5th overall in the drivers championship down to his consistency more than results, having stood on the podium 5 times without a win.

On 21 January 2021, Team WRT announced it would enter an Oreca 07 in the FIA World Endurance Championship with Robin Frijns as one of its drivers.

[57] The season started out strongly, as after a second place in the 1000 Miles of Sebring Frijns and his teamamtes won the 6 Hours of Spa-Francorchamps, taking the championship lead in the process.

Despite a strong end to the season, in which Frijns and his comrades took victories at Fuji, where Frijns experienced an issue with the team radio during the second part of the race, meaning that he couldn't communicate with his engineer,[61] and Bahrain, the point-less middle part of the campaign meant that the team missed out on the championship to Jota, finishing second in the standings.

[64] A luckless season followed, as the trio lost out on a podium at the 24 Hours of Le Mans due to a suspension problem, gave up victory at Monza due to a rare failure of the Gibson engine, and had to settle for second in Bahrain, where a wheel gun issue at the final stop dropped Frijns to second - behind the title-winning sister car.