Flights to Ontario

$29 Cheap flights to Ontario

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight to Ontario departing on 8/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Price Alerts

Not ready to book? to track prices.

Find the cheapest flights from the United States to Ontario

Cheap round-trip flights

United Airlines Logo
10:45 am - 12:14 pmSFO-ONT
1h 29mnonstop
United Airlines Logo
6:39 pm - 8:06 pmONT-SFO
1h 27mnonstop
$57United Airlines
Find Deal
Mon, Aug 4 - Mon, Aug 11
Frontier Logo
10:11 pm - 11:40 pmSFO-ONT
1h 29mnonstop
Frontier Logo
9:41 pm - 11:14 pmONT-SFO
1h 33mnonstop
$66Frontier
Find Deal
Fri, Aug 22 - Sun, Aug 24
American Airlines Logo
8:54 am - 10:05 amDFW-ONT
3h 11mnonstop
American Airlines Logo
2:54 pm - 7:57 pmONT-DFW
3h 03mnonstop
$149American Airlines
Find Deal
Thu, Sep 11 - Tue, Sep 16
Southwest Logo
5:15 am - 11:05 amSEA-ONT
5h 50m1 stop
Southwest Logo
12:10 pm - 7:00 pmONT-SEA
6h 50m1 stop
$154Southwest
Find Deal
Thu, Aug 14 - Mon, Aug 18
Southwest Logo
1:15 pm - 6:00 pmSLC-ONT
5h 45m1 stop
Southwest Logo
4:55 pm - 11:20 pmONT-SLC
5h 25m1 stop
$155Southwest
Find Deal
Sat, Aug 9 - Sat, Aug 16
American Airlines Logo
6:10 pm - 10:48 pmLGA-ONT
7h 38m1 stop
American Airlines Logo
11:59 pm - 12:00 pmONT-LGA
9h 01m1 stop
$159American Airlines
Find Deal
Wed, Aug 6 - Sat, Aug 9
Alaska Airlines Logo
8:42 pm - 11:05 amORD-ONT
16h 23m1 stop
Alaska Airlines Logo
2:21 pm - 11:59 pmONT-ORD
7h 38m1 stop
$213Alaska Airlines
Find Deal
Thu, Aug 7 - Wed, Aug 13
Alaska Airlines Logo
7:00 am - 2:12 pmIAD-ONT
10h 12m1 stop
Alaska Airlines Logo
7:47 pm - 7:33 amONT-IAD
8h 46m1 stop
$234Alaska Airlines
Find Deal
Wed, Sep 3 - Mon, Sep 8
Delta Logo
7:15 am - 10:42 pmORD-ONT
17h 27m1 stop
Delta Logo
1:15 pm - 10:04 pmONT-ORD
6h 49m1 stop
$254Delta
Find Deal
Tue, Aug 26 - Sat, Aug 30
Delta Logo
5:35 am - 10:30 amORD-ONT
6h 55m1 stop
Delta Logo
2:14 pm - 11:56 pmONT-ORD
7h 42m1 stop
$257Delta
Find Deal
Tue, Aug 5 - Wed, Aug 6

See travel insights to Ontario from

Ontario flights insights and trends

Explore insights for your Ontario flight to craft the best travel plan

What is the cheapest month to fly to Ontario?

In general, September is the cheapest month to fly from United States to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $289. If you aren’t able to travel during the month of September, then book flights to Ontario from United States during April instead. Flights to Ontario in April, while not as cheap as those in September, still average around $307.

What is the absolute cheapest flight to Ontario?

In the past two weeks, users have booked deals to Ontario for $65/person, which is 78% cheaper than the average flight to Ontario. To find the cheapest price to Ontario from your area, use momondo’s Airport-to-Airport Pricing Tool.
See prices from:

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 Saturday when prices can be found for as low as $326. This is often the case because there is less demand to fly during this day of the week. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from United States to Ontario for around $377.

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

At noon is the cheapest time of day to fly from United States to Ontario when you can find flight prices for as low as $334. Flying to Ontario at noon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $362 on average. Flights to Ontario from United States in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

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

You are more likely to see cheaper flights to Ontario from United States when booking weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $370 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from United States for as low as $250 on momondo.

Cheap Ontario flight deals and tips

Summary info about Ontario flight prices, duration and airlines

Best One-Way Price

$29

Best Round-Trip Price

$57

Fastest flight time

1h 27m

Popular in

April
The best one-way flight price to Ontario from United States in the last 72 hours is $29 (San Francisco to Ontario).
The best round-trip flight price to Ontario from United States in the last 72 hours is $57 (San Francisco to Ontario).
The fastest flight to Ontario from United States takes 1h 27m (San Francisco to Ontario).
April has the highest demand for flights to Ontario, with a 21% price increase on average.

Frequently asked questions about flying to Ontario

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

Most flyers found that booking tickets 54 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 $358. However, in the past 72 hours, people saw flights from United States for as low as $138.

Is there an alternative airport near Ontario?

Finding an alternative and possibly cheaper destination airport near Ontario is possible. If you are planning a flight to Ontario, consider booking flights to Ontario Airport (3 mi from Ontario city center), San Bernardino Int Airport (24 mi from Ontario city center), Santa Ana J. Wayne/Orange Cnty Airport (29 mi from Ontario city center), Long Beach Municipal Airport (33 mi from Ontario city center) or Burbank Bob Hope Airport (42 mi from Ontario city center).

Is there a cheaper alternative to flying into Ontario?

Prices vary based on where travelers are departing from, but on average, the cheapest airport to fly to in Ontario is San Bernardino Int Airport where the average price is $97. Users typically find the best prices when using momondo’s Airport-to-Airport Pricing Tool.

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

Prices for flights to Ontario Airport refresh daily.

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

How old do you have to be to fly to Ontario Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel to Ontario Airport.

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

The required travel and health documents for your Ontario Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Ontario Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.


Why use momondo?

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

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

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

Yes. All flights to Ontario on momondo can be compared and filtered by various policies on offer, including flexible booking.

How can momondo help me find flights to Ontario?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as filter your options to help you make an informed choice when booking flights to Ontario.

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

If you are not ready to book a flight to Ontario now, use our insights above to find helpful tips or alternatively set up a price alert; this is where momondo will track prices on flights to Ontario and let you know when they change.


An easier way to manage your Ontario trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.
1 adult
Tue 7/15
Tue 7/22

Find better results for your trip to Ontario