The venue for F1 Monaco Grand Prix 2027 is Circuit de Monaco, Monte Carlo, Monaco. From Toronto it's roughly 6,640 km — plan on about 9h 11m in the air, landing at NCE. For the festival dates, round-trip fares start around $585; they climb fastest in the last 6–8 weeks.
Sample fares Toronto → NCE. Final prices and dates are on the partner site.