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Cheap flights from Illinois to Ontario from $61

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Ontario departing on 2/26. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Illinois to Los Angeles

Cheap round-trip flights

These are some of the best round-trip flight deals from Illinois to Los Angeles that have been recently found on momondo from popular airlines, departing in the coming months.

Cheap one-way flights

Flying one-way? These are some of the best deals recently discovered on momondo for flights from Illinois to Los Angeles.

Cheap last minute flights

Planning a quick getaway from Illinois to Los Angeles? These are the last-minute flight deals available now.

Cheap direct flights

If you prefer a non-stop journey, check out our latest direct flight deals to Los Angeles, so you can enjoy a seamless trip without layovers.

Cheap bus & train deals from Illinois to Los Angeles

Find recent round-trip train or bus tickets from Illinois to Los Angeles.

All round-trip flight deals to Los Angeles

The cheapest plane tickets to Los Angeles found on KAYAK recently.
6:50 am - 12:09 amORD-ONT
19h 19m1 stop
12:59 am - 1:25 pmONT-ORD
10h 26m1 stop
$120Frontier
Find Deal
Wed, Feb 19 - Tue, Feb 25
7:05 am - 12:09 amMDW-ONT
19h 04m1 stop
12:59 am - 12:17 amONT-MDW
21h 18m1 stop
$120Frontier
Find Deal
Wed, Feb 19 - Tue, Feb 25
3:40 pm - 9:57 pmORD-ONT
8h 17m1 stop
6:00 am - 5:10 pmONT-ORD
9h 10m1 stop
$246United Airlines
Find Deal
Tue, Jan 7 - Tue, Jan 14
10:35 am - 8:29 pmORD-ONT
11h 54m2 stops
1:45 pm - 9:25 pmONT-ORD
5h 40m1 stop
$251United Airlines
Find Deal
Thu, Jan 9 - Mon, Jan 13
2:25 pm - 10:32 pmORD-ONT
10h 07m1 stop
1:05 pm - 11:59 pmONT-ORD
8h 54m1 stop
$256Delta
Find Deal
Thu, Jan 30 - Wed, Feb 5
6:00 am - 11:55 amMDW-ONT
7h 55m1 stop
1:05 pm - 10:20 pmONT-MDW
7h 15m1 stop
$256Delta
Find Deal
Wed, Jan 29 - Wed, Feb 5
3:35 pm - 10:13 pmORD-ONT
8h 38m1 stop
11:33 am - 11:59 pmONT-ORD
10h 26m1 stop
$266Alaska Airlines
Find Deal
Thu, Jan 30 - Mon, Feb 3
3:35 pm - 10:49 amORD-ONT
21h 14m2 stops
7:00 am - 1:07 pmONT-ORD
28h 07m1 stop
$284Alaska Airlines
Find Deal
Fri, Jan 31 - Sun, Feb 2
10:49 am - 11:58 pmSTL-ONT
15h 09m2 stops
12:59 am - 9:16 amONT-STL
6h 17m1 stop
Sat, Feb 22 - Thu, Feb 27
7:45 am - 4:59 pmORD-ONT
11h 14m2 stops
12:59 am - 1:25 pmONT-ORD
10h 26m1 stop
Fri, Feb 28 - Tue, Mar 4
6:53 pm - 12:09 amSTL-ONT
7h 16m1 stop
$61Frontier
Find Deal
Wed, Feb 26
6:53 pm - 12:09 amSTL-ONT
7h 16m1 stop
$62Frontier
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Wed, Feb 19
7:10 am - 12:40 pmORD-ONT
7h 30m1 stop
$123United Airlines
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Sat, Jan 4
7:20 pm - 11:53 pmORD-ONT
6h 33m1 stop
$128Delta
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Mon, Feb 17
6:00 am - 11:55 amMDW-ONT
7h 55m1 stop
$128Delta
Find Deal
Sat, Jan 25
2:07 pm - 8:13 pmORD-ONT
8h 06m1 stop
$143Alaska Airlines
Find Deal
Wed, Jan 29
6:00 am - 12:01 pmORD-ONT
8h 01m1 stop
$144American Airlines
Find Deal
Wed, Dec 18
4:05 pm - 11:05 amORD-ONT
21h 00m1 stop
$149Alaska Airlines
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Fri, Mar 14
4:48 pm - 10:29 pmORD-ONT
7h 41m1 stop
$156United Airlines
Find Deal
Wed, Jan 1
9:39 am - 3:25 pmSTL-ONT
7h 46m2 stops
$168American Airlines
Find Deal
Tue, Dec 17
4:48 pm - 12:04 amORD-ONT
9h 16m1 stop
12:34 pm - 5:28 pmONT-ORD
26h 54m1 stop
$216Frontier
Find Deal
Wed, Nov 27 - Wed, Dec 4
9:34 am - 12:04 amSTL-ONT
16h 30m1 stop
10:11 pm - 7:34 pmONT-STL
19h 23m1 stop
$244Frontier
Find Deal
Wed, Nov 27 - Wed, Dec 4
5:06 pm - 11:01 pmMLI-ONT
7h 55m1 stop
7:10 am - 4:45 pmONT-MLI
7h 35m1 stop
$488Delta
Find Deal
Wed, Nov 27 - Thu, Nov 28
2:15 pm - 10:45 pmORD-ONT
10h 30m1 stop
1:18 pm - 9:58 pmONT-ORD
6h 40m1 stop
$518Delta
Find Deal
Tue, Nov 26 - Wed, Dec 4
4:48 pm - 6:02 pmORD-ONT
27h 14m2 stops
7:45 am - 5:30 amONT-ORD
43h 45m3 stops
Wed, Nov 27 - Tue, Dec 3
4:20 pm - 9:00 pmORD-ONT
6h 40m1 stop
11:45 am - 10:35 pmONT-ORD
8h 50m1 stop
$563Southwest
Find Deal
Tue, Nov 26 - Tue, Dec 3
11:51 am - 9:04 amORD-ONT
23h 13m2 stops
10:52 pm - 1:09 amONT-ORD
24h 17m2 stops
Tue, Nov 26 - Sun, Dec 1
6:15 am - 1:20 pmORD-ONT
9h 05m2 stops
11:45 am - 10:35 pmONT-ORD
8h 50m1 stop
$568Southwest
Find Deal
Tue, Nov 26 - Tue, Dec 3
5:49 pm - 11:59 pmORD-ONT
8h 10m1 stop
8:19 pm - 5:28 amONT-ORD
7h 09m1 stop
$583Alaska Airlines
Find Deal
Tue, Nov 26 - Wed, Nov 27
6:00 am - 1:27 pmORD-ONT
9h 27m1 stop
4:21 pm - 5:28 amONT-ORD
11h 07m1 stop
$648Alaska Airlines
Find Deal
Wed, Nov 27 - Wed, Nov 27
9:00 am - 11:30 amMDW-ONT
4h 30mnonstop
11:25 am - 5:05 pmONT-MDW
3h 40mnonstop
$344Southwest
Find Deal
Thu, Jan 23 - Wed, Feb 12
9:00 am - 11:30 amMDW-ONT
4h 30mnonstop
8:30 am - 2:15 pmONT-MDW
3h 45mnonstop
$436Southwest
Find Deal
Wed, Feb 26 - Sat, Mar 8
11:55 am - 2:15 pmMDW-ONT
4h 20mnonstop
8:30 am - 2:15 pmONT-MDW
3h 45mnonstop
$532Southwest
Find Deal
Sat, Mar 15 - Sat, Mar 22
10:00 am - 12:25 pmMDW-ONT
4h 25mnonstop
10:30 am - 4:20 pmONT-MDW
3h 50mnonstop
$857Southwest
Find Deal
Thu, Dec 5 - Sun, Dec 8

Frontier flights from Illinois to Ontario

Our best Frontier deals on Illinois to Ontario flight tickets
Frontier
Feb 19
ORD6:50 amChicago O'Hare Intl
19h 19m
1 stop
ONT12:09 amOntario
Feb 25
ONT12:59 amOntario
10h 26m
1 stop
ORD1:25 pmChicago O'Hare Intl
Frontier
Dec 13
ORD8:25 pmChicago O'Hare Intl
20h 41m
1 stop
ONT3:06 pmOntario
Dec 16
ONT6:34 pmOntario
16h 15m
1 stop
ORD12:49 pmChicago O'Hare Intl
Frontier
Dec 12
ORD6:36 pmChicago O'Hare Intl
22h 30m
1 stop
ONT3:06 pmOntario
Dec 16
ONT6:34 pmOntario
16h 15m
1 stop
ORD12:49 pmChicago O'Hare Intl

United Airlines flights from Illinois to Ontario

Our best United Airlines deals on Illinois to Ontario flight tickets
United Airlines
Jan 7
ORD3:40 pmChicago O'Hare Intl
8h 17m
1 stop
ONT9:57 pmOntario
Jan 14
ONT6:00 amOntario
9h 10m
1 stop
ORD5:10 pmChicago O'Hare Intl
United Airlines
Jan 9
ORD10:35 amChicago O'Hare Intl
11h 54m
2 stops
ONT8:29 pmOntario
Jan 13
ONT1:45 pmOntario
5h 40m
1 stop
ORD9:25 pmChicago O'Hare Intl
United Airlines
Jan 3
ORD4:48 pmChicago O'Hare Intl
7h 26m
1 stop
ONT10:14 pmOntario
Jan 7
ONT6:00 amOntario
9h 10m
1 stop
ORD5:10 pmChicago O'Hare Intl

See travel insights to Los Angeles from

How to get the cheapest flight ticket from Illinois to Ontario

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from Illinois to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $166. If you aren’t able to travel during the month of September, then book flights to Ontario from Illinois during November instead. Flights to Ontario in November, while not as cheap as those in September, still average around $240.

What is the cheapest day to depart on your flight to Ontario?

The cheapest day to depart on your flight to Ontario is on a Tuesday when prices can be found for as low as $304. This is often the case because there is less demand to fly during this day of the week. When flying out on a Sunday, the most expensive travel day of the week, you can expect to see flight prices from Illinois to Ontario for around $427.

What is the cheapest time of day to depart on your flight to Ontario?

In the evening is the cheapest time of day to fly from Illinois to Ontario when you can find flight prices for as low as $219. Flying to Ontario in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $395 on average. Flights to Ontario from Illinois at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Illinois to Ontario flight route?

Fly from Chicago Midway to Ontario for the best Illinois - Ontario flight prices

How far in advance should I book a flight to Ontario?

Most flyers found that booking tickets 40 days in advance of their planned departure date is the best time to get cheap flights to Ontario. During this timeframe, flight prices are around $300. However, in the past 72 hours, people saw flights from Illinois for as low as $124.

What cabin class options are available on Illinois to Ontario flights?

There are 1 cabin classes available to choose from on Illinois to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Ontario flights?

You could potentially save up to 56% on your flight if you consider stops on a Illinois to Ontario flight.

Cheap Illinois to Ontario flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Illinois to Ontario

Best Price Found

$61

Fastest flight time

4h 20m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Illinois in the past 72 hours is $61. The best round-trip flight deal from Illinois to Ontario found on momondo in the last 72 hours is $120.
The fastest flight from Illinois to Ontario takes 4h 20m
Direct flights go from Illinois to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • When did momondo last update prices for flights from Illinois to Ontario Airport?

    Prices for flights from Illinois to Ontario Airport refresh daily.

  • How many operators does momondo search for flights from Illinois to Ontario Airport?

  • How old do you have to be to fly from Illinois to Ontario Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Illinois to Ontario Airport.

  • What documentation or ID do you need to fly to Ontario Airport?

    The travel and health documents required for your trip to Ontario Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Ontario Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Illinois to Ontario?


Best airlines flying from Illinois to Ontario

Compare and see reviews for airlines that fly from Illinois to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $121Free CancellationRating
6.1
3,526 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $122Free CancellationRating
6.3
8,176 reviews
Search Spirit Airlines flights
American AirlinesPriceFrom $204Free CancellationRating
7.2
10,000 reviews
Search American Airlines flights
DeltaPriceFrom $256Free CancellationRating
8.0
8,734 reviews
Search Delta flights
SouthwestPriceFrom $256Free CancellationRating
8.1
4,984 reviews
Search Southwest flights
United AirlinesPriceFrom $293Free CancellationRating
7.4
9,156 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Illinois to Ontario?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Illinois to Ontario. momondo saves you time and could save you money on your trip.

Can I find flights from Illinois to Ontario with flexible booking policies on momondo?

All flight searches from Illinois to Ontario on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from Illinois to Ontario?

Once all potential Illinois to Ontario flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Illinois to Ontario right now. Can momondo alert me if prices change?

Price alerts on flights to Ontario from Illinois are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.


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