Nonstop flights from Ontario to Denver

3 airlines fly this route, with up to 8 flights a day.

ONTOntario International

817 mi · 53 flights a week

DENDenver International

ONTDEN

When they leave

Ontario time

5:00a7:56pFirst departure 5:00 AM, last 7:56 PM

11 in the morning, 5:00 AM to 10:55 AM, then four in the afternoon, 12:25 PM to 2:00 PM, then two in the evening, 5:55 PM to 7:56 PM.

Every flight

Earliest first

5:00 AM→8:21 AMUnited AirlinesBoeing 737Daily
6:00 AM→9:24 AMFrontier AirlinesAirbus A320neoDaily
6:20 AM→9:30 AMSouthwest AirlinesBoeing 737Mon, Thu, Fri
6:25 AM→9:40 AMSouthwest AirlinesBoeing 737 MAX 8Sun
6:55 AM→10:10 AMSouthwest AirlinesBoeing 737Tue, Sat
7:00 AM→10:15 AMSouthwest AirlinesBoeing 737Wed
8:10 AM→11:20 AMSouthwest AirlinesBoeing 737 MAX 8Mon, Thu, Fri
9:25 AM→12:35 PMSouthwest AirlinesBoeing 737 MAX 8Sat
10:40 AM→1:50 PMSouthwest AirlinesBoeing 737 MAX 8Sun
10:49 AM→2:10 PMFrontier AirlinesAirbus A320neoMon, Thu, Fri, Sat, Sun
10:55 AM→2:05 PMSouthwest AirlinesBoeing 737Tue, Wed
12:25 PM→3:35 PMSouthwest AirlinesBoeing 737-700Mon, Thu, Fri, Sat, Sun
1:18 PM→4:39 PMUnited AirlinesBoeing 737 MAX 9Daily
1:50 PM→5:05 PMSouthwest AirlinesBoeing 737 MAX 8Tue, Wed
2:00 PM→5:15 PMSouthwest AirlinesBoeing 737-700Mon, Thu, Fri
5:55 PM→9:10 PMSouthwest AirlinesBoeing 737Sun
7:56 PM→11:21 PMFrontier AirlinesAirbus A320neoTue, Wed

Schedules last checked Sep 19, 2026. Times are local.

Flying from Ontario to Denver

Southwest Airlines flies most often, 3 to 4 times a day on the Boeing 737, Boeing 737 MAX 8 and Boeing 737-700. Frontier Airlines flies twice a day on the Airbus A320neo. United Airlines flies twice a day on the Boeing 737 and Boeing 737 MAX 9.

There are 7 or 8 flights every day of the week. The first arrival in Denver is at 8:21 AM and the last at 11:21 PM. The flight covers 817 miles.

Flying back, Denver to Ontario has 53 nonstop flights a week.

Return flights

Denver to OntarioView

Find the cheapest day to fly from Ontario to Denver.

Schedules as of Oct 9, 2026.