According to this source it is 13 flips with 1 race still undecided
https://virginiamercury.com/2025/11/04/blue-wave-rebuilds-the-house-democrats-soar-to-at-least-64-seats-in-virginia/
Blue wave rebuilds the House: Democrats soar to at least 64 seats in Virginia
Democrats managed to increase their majority in the Virginia House of Delegates, moving from 51 to 64 seats (with one race still undecided as of 11 p.m.) as voters turned out Tuesday in a pivotal election for control of the chamber. The win came amid a backdrop of fierce competition across suburban and exurban battlegrounds, with both parties viewing the outcome as a bellwether for 2026 and beyond.
Despite heavy Republican spending and Youngkins late push to recapture momentum, Democrats successfully defended vulnerable incumbents and flipped several key districts in vote-rich regions around Richmond, Northern Virginia and Hampton Roads.
Turnout surged in several suburban swing areas, reflecting continued polarization over national issues like abortion and democracy as well as local concerns over housing, health care and school funding.
Democratic leaders credited what they described as a disciplined, issue-focused campaign that emphasized protecting abortion access and investing in public services, while Republicans leaned on messages about parental rights, public safety and economic management.