In 2018, Spratt elected to forgo a debut senior Commonwealth Games representation for Australia on the Gold Coast, to focus on an Ardennes campaign in Europe. She achieved her first ever one-day podium at World Tour or World Cup level, with a third placing at the Amstel Gold Race in April. Then in May, she won her first Women's World Tour race with a large enough leading margin to move up ten places on the final stage to also win the general classification at Emakumeen Euskal Bira.