Are there nonstop flights from Denver (DEN) to Ottawa (YOW)?

No. The fastest connection is via Toronto, about 3h 55m of total flying time.

What is the fastest connection from Denver (DEN) to Ottawa (YOW)?

via Toronto ≈ 3h 55m, via Chicago ≈ 3h 55m, via Montréal ≈ 4h 14m (estimated flying time, excluding layovers).

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

Denver International Airport (DEN) to Ottawa Macdonald-Cartier International Airport (YOW)・2,436 km

No nonstop flights. The fastest connection is via Toronto (YYZ), about 3h 55m 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.

NEWStarting soon: United Express

17 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.