Ontario Line Cost Explosion
The Ontario Line subway project has more than doubled in cost from $10.9 billion to over $27 billion while being delayed by four years.
🚇 An in effect Transit policy from April 2019 · Implemented · Well sourced
Updated · Created
"World-Class Transit for Ontario"
The Ontario Line is a transformative 15.6-kilometre subway line that will connect communities across Toronto from Ontario Place to the Ontario Science Centre.
"Cost Doubled to $27 Billion After Scrapping the Ready-to-Go Relief Line"
The government cancelled the Relief Line — which had completed significant planning and environmental assessment — to start over with its own design. The Ontario Line then ballooned from $10.9 billion to over $27 billion (a 148% increase) while being delayed from 2027 to 2031. The P3 model that contributed to overruns continues to be used.
- Cost increase: $10.9B → $27.2B (43% increase from 2022 estimate alone)source
- Completion date uncertain — construction to be finished in "early 2030s"source
- Cancelled the advanced Relief Line in 2019 to start fresh with new designsource
- NDP: P3 contracts have caused Ontario Line costs to balloonsource
This section represents editorial interpretation of documented evidence.
Figures are approximate, using publicly available Ontario cost data.
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