Cheap flights from Ontario, CA to Belleville, IL

Flights starting at £87. Choose between Allegiant Air, Frontier Airlines, or Spirit Airlines to find the best price.

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Travelers usually depart from Ontario International, or Montclair (Ontario) when they travel from Ontario to Belleville. The most popular airlines for this route are Allegiant Air, Frontier Airlines, Spirit Airlines, JetBlue Airways, and Avianca. Ontario and Belleville have 56 direct flights per week.

Check-in for a flight from Ontario to Belleville

NameCarrier codeIATA CodePassport needed during bookingOnline check-in available
Allegiant AirAAYG4NoOpens 24 days before flight
Closes 1 hours before flight
Frontier AirlinesFFTF9NoOpens 24 days before flight
Closes 1 hours before flight
Spirit AirlinesNKSNKNoOpens 24 days before flight
Closes 1 hours before flight
JetBlue AirwaysJBUB6NoOpens 24 days before flight
Closes 2 hours before flight
AviancaAVAAVNoOpens 48 days before flight
Closes 1 hours before flight

Weather in Belleville

Average Weather

MonthAverage monthly max temperatureAverage monthly min temperature
January3°C-3°C
February6°C-2°C
March12°C3°C
April18°C8°C
May23°C14°C
June29°C19°C
July30°C20°C
August29°C19°C
September26°C16°C
October19°C10°C
November12°C3°C
December7°C0°C
Hottest Month
30°C
July
Coldest month
-3°C
January
Sunny days
264
days per year
Snow days
9
days per year

14 day forecast

Thursday
21 Mar
11°C0°C
28 Mar
14°C1°C
Friday
22 Mar
86%
16°C3°C
29 Mar
84%
15°C6°C
Saturday
23 Mar
10°C3°C
30 Mar
10°C5°C
Sunday
24 Mar
12°C2°C
31 Mar
11°C0°C
Monday
25 Mar
86%
15°C8°C
1 Apr
15°C1°C
Tuesday
26 Mar
64%
6°C4°C
2 Apr
76%
13°C7°C
Wednesday
27 Mar
11°C-1°C
3 Apr
10°C1°C

Frequently asked questions

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

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