Allen began racing in karting in Australia, winning several national titles before moving to Europe for single-seater competition. He made his car-racing debut in the 2013 Formula BMW Talent Cup, then spent 2014 and 2015 competing in both the Formula Renault 2.0 Alps Series and the Eurocup Formula Renault 2.0 with ARTA Engineering. Results were modest — a lone points finish in the Alps Series in 2014, 11th in 2015 — but the experience prepared him for a prototype career. In 2016 he joined JD Motorsport for the Eurocup and the Northern European Cup, where he took his maiden podium at Spa-Francorchamps and won a race at the Hockenheim season finale.
Allen entered the European Le Mans Series in 2017 with Graff Racing in the LMP2 class. Driving alongside Richard Bradley and Gustavo Yacamán, he helped secure victory at the 4 Hours of Spa-Francorchamps — Allen himself passing silver-ranked Will Owen for the lead during the second hour — and then repeated at the Portimão season finale to finish third in the championship standings. Allen also made his 24 Hours of Le Mans debut that year, finishing fifth in LMP2 alongside Bradley and Franck Matelli despite beaching the car during the morning hours.
He stayed at Graff for 2018 under the G-Drive Racing brand but struggled with repeated co-driver changes and fell to 15th in the standings. A nighttime crash by co-driver José Gutiérrez ended his Le Mans campaign. Towards the close of 2018 Allen made his FIA World Endurance Championship debut in the top LMP1 class with DragonSpeed, retiring at Fuji before finishing sixth at Shanghai alongside Ben Hanley and Renger van der Zande.
For 2019 Allen remained at DragonSpeed for the ELMS alongside Hanley and bronze-ranked Henrik Hedman. He led the crew to victory at Le Castellet in the opening round, setting the fastest lap and passing Roman Rusinov for the race lead, and the team finished fifth in the teams' championship.
Upgraded to FIA Gold driver status ahead of 2020, Allen returned to Graff Racing and partnered Thomas Laurent and silver-ranked Alexandre Cougnaud. The trio finished second at Spa and third at Le Castellet — Laurent delivering a late overtake on Will Stevens — and scored points every weekend on their way to fifth in the teams' standings.
In 2021 Allen moved to Panis Racing alongside Will Stevens and Julien Canal. He tested positive for COVID-19 before the opening round in Barcelona and was replaced by Gabriel Aubry, but returned for round two. At Monza the trio combined to score Panis Racing's first ever ELMS victory. A third place at Spa contributed to a third-place teams' championship finish.
Allen joined Algarve Pro Racing for 2022, contesting a double programme across the FIA WEC and ELMS in the LMP2 Pro-Am subclass. In the WEC alongside René Binder and Steven Thomas, he claimed two subclass victories including one at Le Mans, and finished second overall in the Pro-Am standings.
The 2023 season opened with the most dramatic result of Allen's career at the 24 Hours of Daytona, racing for Proton Competition. In the closing minutes Allen passed Matthieu Vaxivière for second then chased down former teammate Ben Hanley, edging past him at the finish line to win by just 0.016 seconds. In the Asian Le Mans Series that February, Allen took the opening race in Dubai for Algarve Pro thanks to a quick final pit stop.
In the ELMS, Allen was joined by Kyffin Simpson and Cadillac Hypercar driver Alex Lynn at Algarve Pro. A late-race overtake on Louis Delétraz at Le Castellet won round two; the team took the championship lead at a chaotic Spa round, then sealed the title with two second-place results at the double-header finale. Allen also retained his LMP2 Pro-Am class win at Le Mans that year, driving alongside Colin Braun and George Kurtz.
Allen joined Duqueine Team for the 2024 ELMS, partnering rookies Jean-Baptiste Simmenauer and Niels Koolen. It proved a difficult season, the team finishing 13th of 14 in the standings and retiring from Le Mans. Later in 2024 Allen joined new outfit RD Limited in the Asian Le Mans Series. At the first race in Sepang, Allen took the lead from Matthieu Vaxivière before co-driver Tristan Vautier held off the challenge on the final lap to win; they added a second place in race two. Despite strong performances across the rounds, Algarve Pro clinched the title at Abu Dhabi, with RD Limited finishing second in the championship.
At Daytona in early 2025, Allen raced for United Autosports alongside Paul di Resta, Rasmus Lindh, and Dan Goldburg. After original winners Tower Motorsports were disqualified, Allen and his co-drivers were elevated to overall victory, giving him a second Daytona 24 Hours win in three years.
During 2025 Allen split his time between an ELMS campaign with Nielsen Racing in LMP2 Pro-Am — taking a class win at Le Castellet — and his GT3 debut in the GT World Challenge Europe Endurance Cup with Optimum Motorsport, scoring points in all five races with Mikey Porter and Largim Ali. He collected two more podiums for RD Limited in the 2025–26 Asian Le Mans Series. Entering 2026, Allen remained at Nielsen for the ELMS and won the Pro-Am class at Le Castellet in round two alongside Alex Quinn and Kriton Lendoudis.
Allen's career is defined by an ability to execute decisive late-race overtakes in endurance racing — the 0.016-second Daytona winning margin in 2023 being the most vivid example — underpinned by broad versatility across LMP1, LMP2, and GT machinery. The 2023 ELMS title capped a six-season run of continuous podium-building in the championship, establishing him as a premier LMP2 driver of his era.
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