Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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

Question 3

How can momondo help me find flights to Ontario?

Accepted Answer

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.

Question 4

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

Accepted Answer

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.

Question 5

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

Accepted Answer

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 $348. However, in the past 72 hours, people saw flights from United States for as low as $138.

Question 6

Is there an alternative airport near Ontario?

Accepted Answer

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).

Question 7

Is there a cheaper alternative to flying into Ontario?

Accepted Answer

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 $129. Users typically find the best prices when using momondo’s Airport-to-Airport Pricing Tool.

Question 8

Which airlines fly to Ontario?

Accepted Answer

When flying to Ontario from United States, momondo travelers will most often fly with one of these popular airlines: American Airlines, Delta, Frontier or United Airlines. Depending on what airport in United States you fly from, you may be able to find flights with any of these popular airlines.

Question 9

Alaska Airlines Flights to Ontario

Accepted Answer

Alaska Airlines operates around 17 flights into Ontario in any given week. The most common departure point for these flights was from Portland, with the best round-trip Alaska Airlines deal found being $59 (San Francisco to Ontario). Users have rated Alaska Airlines 8.0/10 in over 10,000 reviews on momondo.

Question 10

Southwest Flights to Ontario

Accepted Answer

Southwest flight deals to Ontario start from $97 - this is the best price found recently on momondo, and was a round-trip journey departing from Atlanta Hartsfield-Jackson. Over any normal week, Southwest flight prices are typically higher, but vary depending on where you fly from - Sacramento Intl is the most popular Southwest departure point to Ontario so generally has the most availability. Southwest is scored a 8.0/10 in 4,242 reviews.

Question 11

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

Accepted Answer

Prices for flights to Ontario Airport refresh daily.

Question 12

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

Accepted Answer

As of August 2025, there are 18 operators available to choose from for flights to Ontario Airport.

Question 13

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

Accepted Answer

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.

Question 14

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

Accepted Answer

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.

Question 15

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

Accepted Answer

The cheapest day to depart on your flight to Ontario is on a Friday when prices can be found for as low as $302. 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.

Question 16

What is the absolute cheapest flight to Ontario?

Accepted Answer

In the past two weeks, users have booked deals to Ontario for $55/person, which is 82% 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.

Question 17

How long does it take to fly to Ontario?

Accepted Answer

Average flight duration from United States to Ontario depends on which airport you fly into and out of. Flying from Miami to Los Angeles is 5h 22m on average, while flying from San Francisco to Los Angeles is 1h 28m on average. Los Angeles is the most popular airport in Ontario.

Question 18

What is the cheapest month to fly to Ontario?

Accepted Answer

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 $287. If you aren’t able to travel during the month of September, then book flights to Ontario from United States during July instead. Flights to Ontario in July, while not as cheap as those in September, still average around $292.

Question 19

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

Accepted Answer

In the evening is the cheapest time of day to fly from United States to Ontario when you can find flight prices for as low as $319. 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 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.

Question 20

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

Accepted Answer

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 $358 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 $237 on momondo.

Best One-Way Price	$41
Best Round-Trip Price	$69
Fastest flight time	1h 20m
Popular in	December

$41 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 9/25. 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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What is the cheapest month to fly to Ontario?

What is the absolute cheapest flight to Ontario?

In the past two weeks, users have booked deals to Ontario for $55/person, which is 82% 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?

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

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

How long does it take to fly to Ontario?

Average flight duration from United States to Ontario depends on which airport you fly into and out of. Flying from Miami to Los Angeles is 5h 22m on average, while flying from San Francisco to Los Angeles is 1h 28m on average. Los Angeles is the most popular airport in Ontario.

Cheap Ontario flight deals and tips

Summary info about Ontario flight prices, duration and airlines

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Best Round-Trip Price

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Frequently asked questions about flying to Ontario

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

Is there an alternative airport near Ontario?

Is there a cheaper alternative to flying into Ontario?

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

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

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

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

Why use momondo?

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

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

How can momondo help me find flights to Ontario?

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

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Popular flights to Ontario

Popular routes according to searches in the past day on momondo