Are there nonstop flights from Ottawa (YOW) to San Francisco (SFO)?

No. The fastest connection is via Toronto, about 5h 42m of total flying time.

What is the fastest connection from Ottawa (YOW) to San Francisco (SFO)?

via Toronto ≈ 5h 42m, via Chicago ≈ 5h 43m, via Montréal ≈ 5h 59m (estimated flying time, excluding layovers).

from 15,000 ANA miles (economy, one way, based on the published award charts).

Ottawa Macdonald-Cartier International Airport (YOW) to San Francisco International Airport (SFO)・3,927 km

No nonstop flights. The fastest connection is via Toronto (YYZ), about 5h 42m of flying time (layover not included).

With milesANA 15,000 miles+ (via YYZ)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

16 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.