Cheap Flights from Ontario, CA to Chicago, IL from $64

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On Cheapflightsplus.com you will find 206 connecting flights from Ontario to Chicago. You can compare airfare deals from 4 airlines and multiple travel sites from $64, book and save on cheap plane tickets and last minute offers. Also check out ONT-CHI flight schedule to find best flight time, convenient departure and arrival airports.

Find One-Way and Round-Trip Ontario to Chicago Flight Deals

To find the cheapest one way airline ticket select the date with the lowest price on the calendar below and click «Find Flights». To search for round-trip flight deals click on the link «Check prices for return flights» and select the date of the return flight. Cheapest flights in November: $64 (one-way), $110 (round-trip).

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Best Flights from Ontario to Chicago Today

Take a look at the list of non stop flights and flights with layovers from Ontario to Chicago with the lowest price of $64. Take a look at the list of flights with layovers from Ontario to Chicago from $64. There’re no direct flights. The fastest connecting flight – 5h 40m.

Price	Departure	Arrival	Flight Duration	Airline	Flight
from $64 Find flight	06:30 Ontario Ontario Int.	15:50 Chicago Midway	7h 20m layover 2h 34m - Denver	Frontier Airlines	F91500 F91228
from $67 Find flight	20:35 Ontario Ontario Int.	04:47+1 день Chicago O'Hare International	6h 12m layover 1h 5m - Las Vegas	Frontier Airlines	F94206 F92146
from $67 Find flight	20:35 Ontario Ontario Int.	06:33+1 день Chicago Midway	7h 58m layover 3h 5m - Las Vegas	Frontier Airlines	F94206 F92330
from $67 Find flight	10:39 Ontario Ontario Int.	00:13+1 день Chicago Midway	11h 34m layover 6h 58m - Denver	Frontier Airlines	F91262 F92210
from $67 Find flight	12:28 Ontario Ontario Int.	06:33+1 день Chicago Midway	16h 5m layover 11h 10m - Las Vegas	Frontier Airlines	F91358 F92330
from $67 Find flight	10:55 Ontario Ontario Int.	09:47+1 день Chicago O'Hare International	20h 52m layover 15h 52m - Denver	Frontier Airlines	F91262 F91484
from $70 Find flight	08:04 Ontario Ontario Int.	17:28 Chicago O'Hare International	7h 24m layover 2h 25m - Las Vegas	Frontier Airlines	F94758 F92146
from $70 Find flight	08:04 Ontario Ontario Int.	11:48+1 день Chicago Midway	25h 44m layover 20h 59m - Las Vegas	Frontier Airlines	F94758 F92330
from $70 Find flight	11:20 Ontario Ontario Int.	15:50+1 день Chicago Midway	26h 30m layover 21h 49m - Denver	Frontier Airlines	F91262 F91228
from $71 Find flight	17:30 Ontario Ontario Int.	06:33+1 день Chicago Midway	11h 3m layover 6h 16m - Las Vegas	Frontier Airlines	F92232 F92330
from $71 Find flight	05:45 Ontario Ontario Int.	19:05 Chicago O'Hare International	11h 20m layover 5h 57m - Dallas	Frontier Airlines	F91406 F93242
from $77 Find flight	11:58 Ontario Ontario Int.	00:05+1 день Chicago O'Hare International	10h 7m layover 4h 17m - Houston	Frontier Airlines	F93132 F93136
from $85 Find flight	06:57 Ontario Ontario Int.	15:59 Chicago Midway	7h 2m layover 1h 26m - Dallas	Frontier Airlines	F91406 F91888
from $87 Find flight	11:46 Ontario Ontario Int.	19:30 Chicago O'Hare International	5h 44m layover 0h 44m - Las Vegas	Frontier Airlines	F91358 F92146
from $88 Find flight	16:08 Ontario Ontario Int.	00:13+1 день Chicago Midway	6h 5m layover 1h 29m - Denver	Frontier Airlines	F92908 F92210
from $92 Find flight	22:59 Ontario Ontario Int.	10:42+1 день Chicago Midway	9h 43m layover 4h 53m - Phoenix	Frontier Airlines	F92404 F91736

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*Departure and arrival times - local. Prices indicated for one-way flights. Information updated on May 09, 2025

Flight Schedule Ontario (California) to Chicago (Illinois)

Full flight schedule will help you in detecting at what time planes fly from Ontario to Chicago. You can also specify the concrete flights and airlines on the route and how long the flight actually is. Use the calendar for today, tomorrow or other specific date as some flights are available only on certain days of the week.

Departure	Flight Details	Flight Duration	Price
00:49 — 11:52	06:30 — 09:54 F91500 Frontier Airlines Ontario — Denver 4h 20m stop 08:50 — 12:13 F92210 Frontier Airlines Denver — Chicago	9h 3m including layover	Find flight from$67
05:45 — 17:05	05:45 — 09:11 F91500 Frontier Airlines Ontario — Denver 4h 18m stop 13:29 — 17:05 F93174 Frontier Airlines Denver — Chicago	9h 20m including layover	Find flight from$67
05:45 — 19:05	05:45 — 10:47 F91406 Frontier Airlines Ontario — Dallas 5h 57m stop 16:44 — 19:05 F93242 Frontier Airlines Dallas — Chicago	11h 20m including layover	Find flight from$71
06:30 — 15:50	05:45 — 09:11 F91500 Frontier Airlines Ontario — Denver 2h 34m stop 13:54 — 17:17 F91228 Frontier Airlines Denver — Chicago	7h 20m including layover	Find flight from$64
06:30 — 09:47 +1 day	06:30 — 09:54 F91500 Frontier Airlines Ontario — Denver 20h 16m stop 06:10 — 09:47 F91484 Frontier Airlines Denver — Chicago	25h 17m including layover	Find flight from$67
07:00 — 13:02 +1 day	07:00 — 09:25 AS123 Alaska Airlines Ontario — Portland 21h 35m stop 07:00 — 13:02 AS324 Alaska Airlines Portland — Chicago	28h 2m including layover	Find flight from$247
07:00 — 13:04 +1 day	07:00 — 09:33 AS1058 Alaska Airlines Ontario — Portland 21h 34m stop 07:00 — 13:07 AS324 Alaska Airlines Portland — Chicago	28h 4m including layover	Find flight from$257
08:04 — 17:28	08:04 — 09:12 F94758 Frontier Airlines Ontario — Las Vegas 2h 25m stop 11:37 — 17:28 F92146 Frontier Airlines Las Vegas — Chicago	7h 24m including layover	Find flight from$70
08:04 — 11:48 +1 day	08:04 — 09:12 F94758 Frontier Airlines Ontario — Las Vegas 20h 59m stop 06:11 — 11:48 F92330 Frontier Airlines Las Vegas — Chicago	25h 44m including layover	Find flight from$70
10:39 — 00:13 +1 day	10:55 — 14:18 F91262 Frontier Airlines Ontario — Denver 6h 58m stop 08:50 — 12:13 F92210 Frontier Airlines Denver — Chicago	11h 34m including layover	Find flight from$67
10:55 — 09:47 +1 day	10:55 — 14:18 F91262 Frontier Airlines Ontario — Denver 15h 52m stop 06:10 — 09:47 F91484 Frontier Airlines Denver — Chicago	20h 52m including layover	Find flight from$67
11:20 — 15:50 +1 day	11:20 — 14:39 F91262 Frontier Airlines Ontario — Denver 21h 49m stop 12:28 — 15:50 F91228 Frontier Airlines Denver — Chicago	26h 30m including layover	Find flight from$70
11:58 — 00:05 +1 day	11:58 — 17:11 F93132 Frontier Airlines Ontario — Houston 4h 17m stop 22:08 — 00:45 F93136 Frontier Airlines Houston — Chicago	10h 7m including layover	Find flight from$77
12:28 — 06:33 +1 day	09:26 — 10:33 F91358 Frontier Airlines Ontario — Las Vegas 11h 10m stop 06:50 — 12:34 F92330 Frontier Airlines Las Vegas — Chicago	16h 5m including layover	Find flight from$67
13:45 — 21:25	13:45 — 17:04 UA2278 United Airlines Ontario — Denver 51m stop 17:55 — 21:25 UA1898 United Airlines Denver — Chicago	5h 40m including layover	Find flight from$217
13:45 — 23:59	13:45 — 17:04 UA2278 United Airlines Ontario — Denver 3h 25m stop 20:29 — 23:59 UA377 United Airlines Denver — Chicago	8h 14m including layover	Find flight from$217
14:00 — 23:25	14:00 — 19:16 F93132 Frontier Airlines Ontario — Houston 1h 38m stop 20:54 — 23:25 F93282 Frontier Airlines Houston — Chicago	7h 25m including layover	Find flight from$157
15:24 — 23:59	15:24 — 16:34 F91284 Frontier Airlines Ontario — Las Vegas 1h 44m stop 18:18 — 23:59 F92146 Frontier Airlines Las Vegas — Chicago	6h 35m including layover	Find flight from$157
16:08 — 00:13 +1 day	16:08 — 19:26 F92908 Frontier Airlines Ontario — Denver 1h 29m stop 20:55 — 00:13 F92210 Frontier Airlines Denver — Chicago	6h 5m including layover	Find flight from$88
17:30 — 06:33 +1 day	15:56 — 17:09 F92232 Frontier Airlines Ontario — Las Vegas 6h 16m stop 06:11 — 11:48 F92330 Frontier Airlines Las Vegas — Chicago	11h 3m including layover	Find flight from$71
17:56 — 04:37 +1 day	17:56 — 20:41 F91122 Frontier Airlines Ontario — Salt Lake City 3h 18m stop 23:59 — 04:37 F92028 Frontier Airlines Salt Lake City — Chicago	8h 41m including layover	Find flight from$189
18:13 — 15:50 +1 day	18:13 — 21:35 F92908 Frontier Airlines Ontario — Denver 14h 53m stop 12:28 — 15:50 F91228 Frontier Airlines Denver — Chicago	19h 37m including layover	Find flight from$163
18:13 — 23:16 +1 day	18:13 — 21:35 F92908 Frontier Airlines Ontario — Denver 22h 7m stop 19:42 — 23:16 F93174 Frontier Airlines Denver — Chicago	27h 3m including layover	Find flight from$163
19:15 — 04:53 +1 day	19:15 — 20:44 UA1757 United Airlines Ontario — San Francisco 1h 51m stop 22:35 — 04:53 UA2482 United Airlines San Francisco — Chicago	7h 38m including layover	Find flight from$220
19:15 — 06:13 +1 day	19:15 — 20:44 UA1757 United Airlines Ontario — San Francisco 3h 11m stop 23:55 — 06:13 UA1112 United Airlines San Francisco — Chicago	8h 58m including layover	Find flight from$220
20:35 — 04:47 +1 day	18:44 — 19:53 F94206 Frontier Airlines Ontario — Las Vegas 1h 5m stop 18:31 — 00:12 F92146 Frontier Airlines Las Vegas — Chicago	6h 12m including layover	Find flight from$67
20:35 — 06:33 +1 day	18:44 — 19:53 F94206 Frontier Airlines Ontario — Las Vegas 3h 5m stop 06:50 — 12:34 F92330 Frontier Airlines Las Vegas — Chicago	7h 58m including layover	Find flight from$67
22:59 — 10:42 +1 day	22:59 — 01:27 F92404 Frontier Airlines Ontario — Phoenix 4h 53m stop 06:20 — 10:42 F91736 Frontier Airlines Phoenix — Chicago	9h 43m including layover	Find flight from$92

Departure	Arrival	Flight Details	Flight Time	Price
		stop stop	including layover	Find flight from$

*Departure and arrival times - local. Updated on May 9, 2025

Flight Information

Below we will explain in detail what the flights cost on the destination from Ontario to Chicago depends on and how to choose the most interesting flight option for you.

Distance between Ontario and Chicago is 2751 miles. Time difference between the cities is 2h. Airplanes depart 00:49 to 22:59 from 2 Ontario airports and arrive 00:49 to 22:59 to 7 Chicago airports. Average flight time is 14h 11m.

The fastest flight 5h 40m
Average flight time 14h 11m
The earliest flight 00:49
The latest flight 22:59
Distance 1710 ml

The cheapest months to travel to Chicago are november (from 64 $), december (from 70 $), february (from 85 $).

The most expensive months are january (from 93 $), february (from 85 $), december (from 70 $).

What is the lowest airfare Ontario to Chicago?

The cheapest plane ticket found by our users is $64. This airfare is for economy class on one-way F91500 flight by Frontier Airlines for November 12, 2024 which leaves Ontario Int. in Ontario at 06:30 am and arrives at Chicago Midway at 15:50.

Economy class

$64

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Business class

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First class

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Popular Airlines on the Route

The flight Ontario — Chicago is served by 4 regular airlines and 2 low-cost airlines. Most of the flights on this route are operated by Alaska Airlines - 65 departures per week at the price of from $ 183 . And the most expensive tickets are offered by Volaris airline - from $ 826.

Direct flights

There’re no direct flights on this route. Try flights with stops.

Connecting Flights

There are 206 flights with layovers on the route. The fastest connecting flight is UA2278 by United Airlines takes 5h 40m and the cheapest is F91500 by Frontier Airlines for $64.

AS - Alaska Airlines

from $183

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F9 - Frontier Airlines

from $64

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Y4 - Volaris

from $432

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UA - United Airlines

from $217

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Airports

You can fly from Ontario to Chicago from 2 airports (Ontario Int., International Heliport).

Ontario airports

Ontario Int.-ONT

from $64
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International Heliport-JIO

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Chicago airports

O'Hare International-ORD

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Midway-MDW

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Dupage County-DPA

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Chicago FSS-CHI

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Merrill C Meigs (closed)-CGX

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Pal-Waukee-PWK

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Chicago NAS-NOH

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Airplanes

There are flights to Chicago from Ontario by 4 airlines that use 0 aircraft brands. They range from huge modern airplanes to small-sized.

Top Domestic Destinations from Ontario

You may also consider searching for discounted plane tickets to some other popular places from Ontario within United States.

Ontario — Phoenix

from $56

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Ontario — Denver

from $65

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Ontario — Austin

from $67

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Ontario — Miami

from $62

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Ontario — Tucson

from $80

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Ontario — Las Vegas

from $63

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Ontario — Seattle

from $65

Find
Ontario — Boise

from $70

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Ontario — Chicago

from $78

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Ontario — Philadelphia

from $62

Find

Top International Destinations from Ontario

Our state-of-the art metasearch will definitely provide you with the best airfare on international flights. We’re proud to partner with many reliable travel suppliers located outside the US what gives us an opportunity to offer the most competitive prices on far destinations.

Ontario — London

from $62

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Ontario — San Jose

from $61

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Ontario — Guadalajara

from $70

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Ontario — Cancun

from $74

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How to book a plane ticket yourself?

Fill in the search parameters — cities of departure and destination, departure and return dates and click «Find flights»
Select the best flight that you like. Please, check the airports of departure and arrival. Select the best fare, but pay attention to the following flight details - airports of departure and arrival, flight duration and layovers. Please use filters and sort to find the best flight.
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That's it — you will receive an email with your e-ticket usually within 10 minutes after your flight is confirmed. Please, print the e-ticket and have it with you at the airport. You would need to have only a passport and/or a required form of ID to travel. Please, check your Visa requirements if you travel outside of the United States or Canada.
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