Cheap flights from Cincinnati, OH to Ontario, CA

Flights starting at $91. Choose between Frontier Airlines, United Airlines, or Alaska Airlines to find the best price.

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Book your trip to arrive at Ontario International, or Montclair (Ontario). The most popular airlines for this route are Frontier Airlines, United Airlines, Alaska Airlines, Allegiant Air, and Spirit Airlines. Cincinnati and Ontario have 97 direct flights per week.

Check-in for a flight from Cincinnati to Ontario

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
United AirlinesUALUAYesNo
Alaska AirlinesASAASNoOpens 24 days before flight
Closes 1 hours before flight
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight

Weather in Ontario

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January18°C7°C
February18°C7°C
March20°C8°C
April23°C10°C
May25°C13°C
June29°C16°C
July33°C19°C
August33°C20°C
September32°C18°C
October27°C15°C
November22°C10°C
December17°C7°C
Hottest Month
33°C
August
Coldest month
7°C
February
Sunny days
339
days per year

14 day forecast

Sunday
10 Mar
19°C9°C
17 Mar
25°C12°C
Monday
11 Mar
17°C9°C
18 Mar
26°C13°C
Tuesday
12 Mar
85%
19°C11°C
19 Mar
26°C14°C
Wednesday
13 Mar
20°C11°C
20 Mar
24°C14°C
Thursday
14 Mar
19°C10°C
21 Mar
20°C11°C
Friday
15 Mar
20°C11°C
22 Mar
17°C11°C
Saturday
16 Mar
22°C10°C
23 Mar
20°C10°C

Frequently asked questions

What are the most popular routes to and from Cincinnati?
What are the most popular routes to and from Ontario?
Which airports are there in Cincinnati?
What airports are near Cincinnati?
What airports are near Ontario?
Is it possible to combine flights, buses, and trains in one itinerary when traveling between Cincinnati and Ontario?
What is Virtual Interlining and how do I use it?
Which airlines fly between Cincinnati and Ontario?
When's the best time to travel between Cincinnati and Ontario?
What flights operate between Cincinnati and Ontario?
How many airports are there near Cincinnati?
How many airports are there near Ontario?
What time do nonstop (direct) flights between Cincinnati and Ontario depart?
What time do nonstop (direct) flights between Cincinnati and Ontario arrive?
What time do flights between Cincinnati and Ontario depart?
What time do flights between Cincinnati and Ontario arrive?

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