$156 Cheap Flights from Ontario International

One-way

Departing from

Going to

Departing from

Ontario International

Going to

anywhere

Santa Rosa (STS)

United States • May, 2026

99% AI deal score

$650 $156

Bangkok (BKK)

Thailand • May, 2026

95% AI deal score

$990 $445

Rome (FCO)

Italy • August, 2026

92% AI deal score

$1,000 $317

Top Destinations Where Can You Fly from Ontario International

Cheap flights from Ontario International

Santa Rosa, United States

TOP

Apr • Direct

$325

$79

-$246

76%

Denver, United States

TOP

Apr • Direct

$105

$29

-$76

72%

Las Vegas, United States

TOP

Apr • Direct

$68

$34

-$34

50%

San Francisco, United States

TOP

Apr • Direct

$93

$59

-$34

37%

Houston, United States

TOP

Jun • Direct

$253

$106

-$147

58%

Find flights from Ontario International to anywhere

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Looking for inspiration on destinations? Here are some popular flight deals from Ontario International one-way fares:

Denver, United States - from $29 (direct)

Las Vegas, United States - from $34 (direct)

San Francisco, United States - from $58 (direct)

Los Angeles, United States - from $65 (1 stop • Las Vegas (LAS))

El Paso, United States - from $79 (1 stop • Denver (DEN))

Santa Rosa, United States - from $79 (direct)

Chicago, United States - from $86 (1 stop • Las Vegas (LAS))

Oklahoma City, United States - from $94 (1 stop • Denver (DEN))

Houston, United States - from $96 (direct)

Fayetteville, United States - from $96 (1 stop • Las Vegas (LAS))

See more destinations you can fly to from Ontario International – anywhere in the world at the best prices.

See More Destinations

Last-Minute Flights from Ontario International

The best flight deals leaving from Ontario International soon

Mon, Apr 6

⌛ Last-Minute

Da Nang, Vietnam

Ontario (ONT) - Da Nang (DAD)

Korean Air airlines • 2 stops • Seattle (SEA), Seoul (ICN)

$1,150

$454

-$696

61%

Mon, Apr 6

⌛ Last-Minute

Dubai, United Arab Emirates

Ontario (ONT) - Dubai (DXB)

United Airlines airlines • 2 stops • Chicago (ORD), Zürich (ZRH)

$565

$597

+$32

Tue, Apr 7

⌛ Last-Minute

London, United Kingdom

Ontario (ONT) - London (LHR)

United Airlines airlines • 1 stop • San Francisco (SFO)

$875

$484

-$391

45%

Tue, Apr 7

⌛ Last-Minute

Las Vegas, United States

Ontario (ONT) - Las Vegas (LAS)

Frontier Airlines airlines • 1 stop • Salt Lake City (SLC)

$68

$90

+$22

32%

Tue, Apr 7

⌛ Last-Minute

Redmond, United States

Ontario (ONT) - Redmond (RDM)

Hawaiian Airlines airlines • 1 stop • Seattle (SEA)

$680

$254

-$426

63%

Tue, Apr 7

⌛ Last-Minute

Paris, France

Ontario (ONT) - Paris (CDG)

Frontier Airlines airlines • 2 stops • Las Vegas (LAS), Calgary (YYC)

$1,225

$359

-$866

71%

See More Details

Facts About Flights from Ontario International

Nearby airport(s)

Ontario International (ONT)

Ontario, United States

Insights for flights from Ontario International

Cheapest route found

$150

Recent fare for flights from Ontario International.

Cheapest month to fly

February

Average fares are lowest in this month.

Typical price range (round-trip)

150$ - 400$

For economy class tickets from Ontario International, found in the last week.

Most popular airlines from Ontario International

American Airlines

Alaska Airlines, Inc.

JetBlue Airways

Delta Air Lines

Frontier Airlines

Allegiant Air

ONT Airport Deal Stats

Current most discounted routes

ONT - Bangkok

80% OFF

ONT - Santiago de Compostela

80% OFF

ONT - Rome

76% OFF

Avg. most discounted routes (last 3 months)

ONT - Valencia

74% OFF

ONT - Paris

71% OFF

ONT - Barcelona

70% OFF

ONT airport insights

Best days to catch a deal

Thursday, Monday

For the best flight deals from Ontario International airport, focus your search on Saturdays, when the lowest fares are most frequently found. Tuesdays also offer good deals out of Ontario International, making them a smart choice for booking your trip.

Avg. deal survival time

12.6 hours

Deals from Ontario International airport typically last around 12.6 hours. This means that travelers need to act fast to secure flights they are interested in.

Rare deal frequency

19 deals

We uncovered 19 rare flight deals originating from Ontario International airport in the last month. These exclusive deals, identified by an AI Deal Score of 90+, typically include mistake fares, special promotions, or ultra-discounts.

Average price drop

-45%

Travelers departing from Ontario International Airport can rejoice, as deal prices typically drop by an average of 45.1%. Keep an eye on flights from Ontario International to snag potential savings.

Next 4 weeks: deal forecast

Ontario International Flight Deals Next Month

Based on current data from 3/27/2026, flight deals from Ontario International are expected to remain stable next month. We do not anticipate any significant price drops or increases at this time.

Top 5 biggest price drops (last 3 months)

Found on March 25

ONT - Bangkok

$3,150 → $636

80%

Found on March 27

ONT - Santiago de Compostela

$1,775 → $358

80%

Found on March 21

ONT - Rome

$1,315 → $316

76%

Found on March 27

ONT - Valencia

$1,450 → $379

74%

Found on March 24

ONT - Paris

$1,225 → $359

71%

Check these nearby airports too

Looking for more options? These airports near ONT sometimes drop rare deals too:

Los Angeles International (LAX)

~9 rare deals/month

San Diego International (SAN)

~12 rare deals/month

John Wayne (SNA)

~3 rare deals/month

If you’re flexible with departure cities, it’s worth keeping an eye on nearby airports — especially LAX and SAN for long-haul deal surprises.

Travel Trends: Popular Destinations from Ontario International

Every month, we analyze search and booking data to see where travelers from Ontario International are heading. Here are the current hot destinations from Ontario International:

Top domestic destinations

Vancouver

TOP

Ontario International

Calgary

TOP

Ontario International

Montreal

TOP

Ontario International

These cities are seeing the most searches and bookings from Ontario International this month.

Top international destinations

London

TOP

United Kingdom

Rome

TOP

Italy

Tokyo

TOP

Japan

Travelers from Ontario International are flocking here, possibly due to seasonal events or great deals.

Travel trend insight

Travelers from Ontario are increasingly seeking culturally rich experiences abroad. London, Rome, and Tokyo are trending due to their historical significance, iconic landmarks, and unique cultural offerings, providing diverse and memorable travel experiences.

Booking Flights from Ontario International: Frequently Asked Questions

Flight costs from Ontario, CA, can vary wildly depending on your destination, the time of year, and how far in advance you book. For example, a short hop to Las Vegas might only set you back $50-$100, while a transcontinental flight to New York could range from $200-$500. International flights, of course, will be pricier, potentially costing anywhere from $500 to several thousand dollars. To snag the best deal, consider using RatePunk Flights Search to monitor prices and set up fare alerts for your desired routes. Remember, flexibility is your friend – flying on weekdays or during the off-season can save you some serious cash.

Booking cheap flights is an art, not a science! Start by being flexible with your travel dates; flying mid-week or during the shoulder season (spring and fall) is usually cheaper. Keep an eye on budget airlines that fly from Ontario, as they often have promotional fares. Setting up fare alerts on websites like RatePunk will notify you when prices drop. Also, consider booking connecting flights instead of direct ones, as they can sometimes be significantly cheaper. Finally, don't be afraid to mix and match airlines – flying out on one airline and back on another can sometimes yield a better deal.

Generally, the sweet spot for snagging the cheapest flights from Ontario is during the shoulder seasons (spring and fall). Summer and major holidays (Thanksgiving, Christmas) are peak travel times, which means higher prices. If you're looking to escape the summer heat, consider flying in late spring (April-May) or early fall (September-October). Conversely, if you're dreaming of a winter getaway, look at traveling in January or February. The key is to avoid the crowds and be flexible with your dates.

Pro Tips for Finding Cheap Flights from Ontario International

Finding the cheapest airfare from Ontario International is easier if you use a few smart strategies. Here are our top tips to help you score a great deal:

Be Flexible with Dates: Sometimes shifting your travel dates by just a day or two can lead to significant savings. Mid-week flights are often cheaper than weekend flights, and consider flying on holidays themselves!

Set Destination to 'Anywhere': Not sure where to go? Set your destination to 'Anywhere' on flight search engines. You might stumble upon a ridiculously cheap flight to a place you've never considered. It is a fun way to pick your next trip!

Explore More Destinations from Ontario International

Looking for more options? Here are some popular routes and related travel deals:

Flights from Ontario to Hong Kong - Find cheap flights from Ontario to hkg

Flights from Ontario to Reykjavik - Find cheap flights from Ontario to rek

Cheap flights to Ontario - Searching for cheap flights to Ontario? (Great for friends/family visiting you, or return trips.)

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$156 Cheap Flights from Ontario International

Top Destinations Where Can You Fly from Ontario International

Cheap flights from Ontario International

Santa Rosa, United States

$79

Denver, United States

$29

Las Vegas, United States

$34

San Francisco, United States

$59

Houston, United States

$106

Find flights from Ontario International to anywhere

Last-Minute Flights from Ontario International

The best flight deals leaving from Ontario International soon

Mon, Apr 6

Ontario (ONT) - Da Nang (DAD)

$454

Mon, Apr 6

Ontario (ONT) - Dubai (DXB)

$597

Tue, Apr 7

Ontario (ONT) - London (LHR)

$484

Tue, Apr 7

Ontario (ONT) - Las Vegas (LAS)

$90

Tue, Apr 7

Ontario (ONT) - Redmond (RDM)

$254

Tue, Apr 7

Ontario (ONT) - Paris (CDG)

$359

Facts About Flights from Ontario International

Nearby airport(s)

Ontario International (ONT)

Insights for flights from Ontario International

$150

February

150$ - 400$

Most popular airlines from Ontario International

ONT Airport Deal Stats

Current most discounted routes

Avg. most discounted routes (last 3 months)

ONT airport insights

Thursday, Monday

12.6 hours

19 deals

-45%

Ontario International Flight Deals Next Month

Top 5 biggest price drops (last 3 months)

ONT - Bangkok

ONT - Santiago de Compostela

ONT - Rome

ONT - Valencia

ONT - Paris

Check these nearby airports too

Los Angeles International (LAX)

San Diego International (SAN)

John Wayne (SNA)

Travel Trends: Popular Destinations from Ontario International

Top domestic destinations

Vancouver

Calgary

Montreal

Top international destinations

London

Rome

Tokyo

Travel trend insight

Booking Flights from Ontario International: Frequently Asked Questions

How much does it typically cost to fly from Ontario, CA?

How much does it typically cost to fly from Ontario, CA?

What are some insider tips for booking cheap flights from Ontario?

What are some insider tips for booking cheap flights from Ontario?

When is the best time of year to fly out of Ontario for the lowest prices?

When is the best time of year to fly out of Ontario for the lowest prices?