Are there direct flights from Denver to Ontario?

Yes, direct flights are available. Minimum direct price — from $53.

Cheap flights Denver — Ontario from $53

Q: How long is the flight from Denver to Ontario?

Approximate flight time — 2h 1m.

Q: How much do flights from Denver to Ontario cost?

The minimum price over 3 months — from $53 on 11.11.2026.

Q: Which airlines fly from Denver to Ontario?

This route is served by 1 airline: Frontier Airlines.

Q: From which airports does Denver operate flights?

From Denver: DEN (Denver International Airport).

Q: To which airports in Ontario do flights arrive?

To Ontario: ONT (Ontario International Airport).

Q: Which day of the week is cheapest?

The cheapest day of the week — Wednesday.

Q: When is the best time to buy tickets Denver — Ontario?

Optimal — 1–3 months before departure. Check the calendar above — it shows the best dates.

How many travellers?

Adults

12+ years

Children

2–11 years

Infants

under 2

Choose your departure date

Cheapest: $53 on 11.11.2026

Prices shown are from searches by other travellers over the last 24 hours. Missing a date? Click any day — we'll find tickets anyway.

November 2026

December 2026

January 2027

Prices found for 6 of 90 days. Prices update as more travellers search. Click any date to search live.

Depart

—

Return

—

Cheapest flights found

11 Nov 2026, Wed

Frontier Airlines F9 1261

08:29

DEN Denver International Airport

10:51

ONT Ontario International Airport

2h 22m Direct

View this ticket

14 Nov 2026, Sat

Frontier Airlines F9 2907

19:17

DEN Denver International Airport

21:42

ONT Ontario International Airport

2h 25m Direct

View this ticket

16 Dec 2026, Wed

Frontier Airlines F9 2907

19:20

DEN Denver International Airport

21:45

ONT Ontario International Airport

2h 25m Direct

View this ticket

15 Nov 2026, Sun

Frontier Airlines F9 2907

19:10

DEN Denver International Airport

21:35

ONT Ontario International Airport

2h 25m Direct

View this ticket

Flights by stops

Direct

from $53

4 flights

All flights 4 days

11 Nov 2026, Wed

Frontier Airlines F9 1261

08:29

DEN Denver International Airport

10:51

ONT Ontario International Airport

2h 22m Direct

View this ticket

14 Nov 2026, Sat

Frontier Airlines F9 2907

19:17

DEN Denver International Airport

21:42

ONT Ontario International Airport

2h 25m Direct

View this ticket

15 Nov 2026, Sun

Frontier Airlines F9 2907

19:10

DEN Denver International Airport

21:35

ONT Ontario International Airport

2h 25m Direct

View this ticket

16 Dec 2026, Wed

Frontier Airlines F9 2907

19:20

DEN Denver International Airport

21:45

ONT Ontario International Airport

2h 25m Direct

View this ticket

Route characteristics

Distance

1 289 km

Flight time

2h 1m

Time difference

-1h

Minimum price

from $53 (11.11.2026)

Average price

$60

Maximum price

$64

Departures per week

Cheapest day

Wednesday

Departure airports (1)

DEN Denver International Airport

Arrival airports (1)

ONT Ontario International Airport

Airlines (1)

F9 Frontier Airlines

Agencies (3)

Trip.com Farera Tickets

Prices by day of week

Price trend by month

Airlines — cheapest prices 1

Frontier Airlines

Low-cost 7 flights · 7 days

$53

Where to buy tickets 3

Trip.com

4 tickets · 4 days

from $53

Farera

2 tickets · 2 days

from $174

Tickets

1 tickets · 1 days

from $253

Airports

From — Denver (1)

DEN Denver International Airport

To — Ontario (1)

ONT Ontario International Airport

Other destinations from Denver

Frequently asked questions about the route Denver — Ontario

How long is the flight from Denver to Ontario?

Approximate flight time — 2h 1m. This is an average for a direct flight. With connections, the time may be longer.

What is the distance from Denver to Ontario?

The straight-line distance — 1 289 km.

How much do flights from Denver to Ontario cost?

The minimum price over 3 months — from $53 on 11.11.2026.

What is the average ticket price?

The average price — $60. Range: $53 — $64.

What is the time difference between Denver and Ontario?

The difference — -1h.

From which airports does Denver operate flights?

From Denver: DEN (Denver International Airport).

To which airports in Ontario do flights arrive?

To Ontario: ONT (Ontario International Airport).

Which airlines fly this route?

This route is served by 1 airline: Frontier Airlines.

Are there direct flights?

Yes, there are direct flights. Minimum direct price — from $53. Total direct flights found: 4.

Which day of the week is cheapest?

The cheapest day of the week — Wednesday.

When is the best time to buy tickets?

Optimal — 1–3 months before departure. Check the calendar above — it shows the best dates.

How do I book flights?

Click "View this ticket" on any flight card — you'll be redirected to the booking page with this specific ticket pre-selected.

About the route Denver — Ontario

Flights Denver — Ontario is a popular route. The straight-line distance is 1 289 km. Flight time 2h 1m. Time difference -1h.

From Denver (DEN) flights depart from 1 airport: DEN. To Ontario (ONT) — 1 arrival airport: ONT.

1 airline operate on this route: Frontier Airlines.

The minimum price for the next 3 months — from $53 (11.11.2026). The cheapest dates are highlighted in the calendar above.

The average ticket price — $60, ranging from $53 to $64. Book 1–3 months in advance to get the best deals.

Cheapest day to fly — Wednesday.

Other destinations in United States from Denver

Cheap flights Denver — Ontario

From — Denver (1)

To — Ontario (1)

Flights

Data

Documents

Contacts