How popular is this Portland to Ontario flight route?

Flights from Portland to Ontario have been viewed 116 times in the past calendar month.

How long is the flight from Portland to Ontario?

Airlines like Frontier fly from Portland to Ontario in about 2h 21m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 839 mi. Generally, flights for this route are nonstop.

What are the cheapest airlines flying from Portland to Ontario round-trip?

Frontier, at $69, was found to be the cheapest airline from Portland to Ontario.Alternate airlines to your destination round-trip include Delta and Hawaiian Airlines. Frontier is priced at 67% lower than the current average price of a flight leaving 3 months from now.

How far ahead should I book a flight from Portland to Ontario?

The price you pay for your flight from Portland to Ontario may vary depending on when you book. For the best chance of a lower fare, look to book 73 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

What is the cheapest month to book a flight from Portland to Ontario?

Currently, August is the cheapest month in which you can book a flight from Portland to Ontario (average of $246). Flying from Portland to Ontario in March is currently the most expensive (average of $328). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest day to fly from Portland to Ontario?

Travelers seeking maximum savings on their Portland to Ontario flight should consider departing on Saturday at noon when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Ontario ranges from 0.1 - 3.4 inches per month. February is typically the wettest month, when rainfall can reach 3.4 in. June is typically the driest time to visit Ontario when rainfall is around 0.1 in.

If weather is an important factor for your trip to Ontario, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 78.8 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 53.6 F).

What are the cheapest flights from Portland to Ontario?

While on average a flight from Portland to Ontario is generally $159, our data shows the cheapest flight currently is $66. When looking at the most popular route, (Portland - Ontario), you can expect to pay $76 for that flight.

What are the most reliable airlines from Portland to Ontario?

The top 3 most reliable airlines when flying from Portland to Ontario are Alaska Airlines (87%), Horizon Air (87%) and Hawaiian Airlines (87%).

What are the most popular airlines that fly from Portland to Ontario?

The most popular airlines flying from Portland to Ontario are Alaska Airlines, Delta and Frontier. Something to consider prior to booking your flight.

What is the cheapest day to fly round-trip from Portland to Ontario?

Flights from Portland to Ontario are found to be more expensive on Tuesday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Ontario.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 58 days in advance, which can save you up to 176% on flights from Portland to Ontario compared to booking the week you need them. Waiting 58 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $195. For sooner than that we have options available in the next 3 days from $298.

What is the cheapest month to fly from Portland to Ontario?

Due to multiple factors, expect to potentially pay more when booking in November. For low rates, January can be a great choice for travel to Ontario. Flights to Ontario from Portland in January are about $194 on average during January, but can be found for as low as $49.

What is the cheapest time of day to fly from PDX to ONT?

When flying from Portland to Ontario, the time of day you fly usually plays a role in the price. Save by searching for a flight in the morning, which can drop the price by up to 23% versus a flight in the evening.

What airports do I use to fly from Portland to Ontario?

You will need to book a flight from Portland to Ontario if you want to fly from Portland to Ontario. At least 6 different airlines have flights from Portland (PDX) to Ontario (ONT) on a regular basis. There is 1 flight to Ontario from the Portland airport per day. If you manage to book one that is nonstop, then you can expect the flight time from PDX to ONT to be around 2h 16m.

Can I find deals for flights from Portland to Ontario that include hotel bookings?

Yes. In addition to deals on Portland to Ontario flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Portland to Ontario?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Ontario.

Can I find deals for business class flights from Portland to Ontario?

Yes. Cheapflights offers flight deals from Portland to Ontario by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

$73+ Flights from Portland to Ontario

Round-trip from	$102 (Cheapflightsfares)
One-way from	$73 (CheapOair)
Popular in	March
Cheapest in	September
Average price	$146
Good round-trip deal	$139 or less
Good one-way deal	$100 or less

Alaska Airlines offers 32” legroom in Main Cabin, enhancing comfort on short domestic flights.

Alaska Airlines' Wi-Fi is available for a flat fee, ideal for working during flights.

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$69	Average$140	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$93	Average$286	FlexibilityNo cancel fee	On-timeN/A
Hawaiian Airlines	Cheapest$108	Average$236	FlexibilityNo cancel fee	On-time85%
Alaska Airlines	Cheapest$156	Average$281	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$158	Average$341	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$173	Average$290	FlexibilityNo cancel fee	On-time63%

$73+ Cheap flights from Portland to Ontario (PDX - ONT)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 11/7. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Portland to Ontario with Cheapflights

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Cheapflights Tip: The best prices from Portland to Ontario are usually found in September or August, booked 73 days in advance, depart on a Thursday or Friday and return on a Friday

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Cheapest flights from Portland to OntarioExplore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

Explore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.

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Use the filters below to find and compare flights from Portland to Ontario that are best for you.

The best insider tips for Portland to Ontario flights

Cheapflights partnered with top experts to bring you the best recommendations for your Portland to Ontario trip

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ONT

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Best time to book a flight from Portland to Ontario

Have a flexible travel schedule? Discover the best time to fly to Ontario from Portland with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Portland to Ontario

How far ahead should I book a flight from Portland to Ontario?

What is the cheapest month to book a flight from Portland to Ontario?

What is the cheapest time of day to fly from PDX to ONT?

What is the cheapest day to fly from Portland to Ontario?

Reviews of airlines servicing Ontario

Read through reviews of airlines operating flights from Portland to Ontario, such as Alaska Airlines, Southwest, and Delta. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

Find useful and relevant information for your journey from Portland to Ontario. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

What airports do I use to fly from Portland to Ontario?

How popular is this Portland to Ontario flight route?

How long is the flight from Portland to Ontario?

What are the cheapest airlines flying from Portland to Ontario round-trip?

What are the most reliable airlines from Portland to Ontario?

What are the cheapest flights from Portland to Ontario?

Can I find deals for flights from Portland to Ontario that include hotel bookings?

How can I find direct flights from Portland to Ontario?

Can I find deals for business class flights from Portland to Ontario?

What is the cheapest month to book a flight from Portland to Ontario?

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Alternative routes for Portland to Ontario

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Top 6 airlines flying from Portland to Ontario

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Cheapest flights from Portland to Ontario
Explore the most affordable flight options available from Portland to Ontario. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 20, 2025.