Lukas started his professional karting career in 2014 competing in the Mini Max category of Eastern European Rotax Max Challenge Central. For the finale of that campaign, he finished 2nd. He then went on to compete again in the Rotax Max Challenge Central-Eastern Europe in 2016 but this time in the junior category.
Dunner then made his single seater debut with MP Motorsport in Formula 4 SMP Championship. In this championship, he finished in 13th behind Estonian Jan-Erik Meikup. Also during 2017, he competed in Formula 4 Spanish Championship, driving again with MP Motorsport. With 2 podiums, he scored 129 points finishing in 8th. Dunner also raced in the 2nd Mugello round in Italian Formula 4, with Prema Powerteam. His best position that weekend was 9th, earning 2 points. As a guest driver though, he was unable to classify within the standings.
For 2018, he competed in a round of endurance, racing in V de V Endurance Series in the LMP3 class. In the race, he finished in 2nd place putting him with 54 points. This meant he finished 31st as he only competed in one round of the championship. Also during this year, Lukas made his Euroformula Open debut with Drivex School. Earning 2 podiums meant he achieved 83 points, putting him 7th in his first outing in Euroformula.
2019 provided a year of racing. Once again, Lukas drove in Euroformula Open, this time with Teo Martín Motorsport. This time, he achieved 6 podiums, with the highest position being 2nd twice in Spa and Hungaroring. With 125 points under his name, he finished 3rd in the standings with Marino Sato and Liam Lawson ahead of him. Dunner competed with Inter Europol Competition in the 4 hours of Spa, driving with Adrien Tambay and Jakub Smiechowski. In the Ultimate Cup Series, he competed with Wimmer Werk Motorsport, competing in 2 races. In these races, he finished 1st in both, meaning he gained 75 points. This meant he finished 6th in the standings overall.
FIA Formula 3
Lukas made his debut with Formula 3 machinery in the 2019 Macau Grand Prix. He raced with MP Motorsport for the race. In the qualifying session, he ended up 24th, starting the qualifying race there. Lukas then made up 12 positions to 12th, behind Irani Keyvan Andres. For the main race, he finished in 14th behind Dan Ticktum.
Lukas Dunner will make his proper Formula 3 debut in the 2020 season, driving for MP Motorsport. He will be joined with Richard Verschoor and Bent Viscaal. The car he will be driving will be number #19.