[5] Lampaert won the 2017 Dwars door Vlaanderen, a local race for him,[6] after he soloed away to the victory after making the race-defining split along with teammate Philippe Gilbert, Alexey Lutsenko from the Astana team, and Orica–Scott's Luke Durbridge.

[7] Lampaert attacked with 7.5 kilometres (4.7 miles) remaining and ultimately won the race by 39 seconds ahead of Gilbert.

Lampaert won Stage 2 of the 2017 Vuelta a España after he broke clear of the peloton in strong winds with three kilometres to go with three Quick Step teammates, Niki Terpstra, Julian Alaphilippe and Matteo Trentin.

[10] Lampaert won the first stage of the 2022 Tour de France, ahead of Wout van Aert and Tadej Pogačar.

[11] In November 2022, Lampaert signed a three-year contract extension with the Quick-Step Alpha Vinyl Team, until the end of the 2025 season.