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Cheap flights from Portland to Ontario from $38

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Ontario departing on 5/25. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
0 bags

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Find the cheapest flights from Portland to Los Angeles

Cheap round-trip flights

KAYAK's recommended round-trip deals from the most popular airlines that fly from Portland to Los Angeles.
Frontier Logo
11:04 am - 1:24 pmPDX-ONT
2h 20mnonstop
Frontier Logo
2:30 pm - 4:55 pmONT-PDX
2h 25mnonstop
$77Frontier
Find Deal
Thu, May 29 - Mon, Jun 2
Frontier Logo
11:04 am - 1:24 pmPDX-ONT
2h 20mnonstop
Frontier Logo
2:30 pm - 4:55 pmONT-PDX
2h 25mnonstop
$100Frontier
Find Deal
Thu, May 29 - Mon, Jun 2
Alaska Airlines Logo
7:00 am - 9:16 amPDX-ONT
2h 16mnonstop
Alaska Airlines Logo
7:00 am - 9:26 amONT-PDX
2h 26mnonstop
$157Alaska Airlines
Find Deal
Wed, May 7 - Sat, May 10
Alaska Airlines Logo
9:42 pm - 11:58 pmPDX-ONT
2h 16mnonstop
Alaska Airlines Logo
7:00 am - 9:26 amONT-PDX
2h 26mnonstop
$167Alaska Airlines
Find Deal
Mon, May 5 - Tue, May 13
United Airlines Logo
7:54 am - 12:24 pmPDX-ONT
4h 30m1 stop
United Airlines Logo
6:00 am - 12:33 pmONT-PDX
6h 33m1 stop
$182United Airlines
Find Deal
Wed, May 21 - Sun, May 25
Delta Logo
7:23 am - 1:55 pmPDX-ONT
6h 32m1 stop
Delta Logo
11:45 am - 4:32 pmONT-PDX
4h 47m1 stop
$187Delta
Find Deal
Sun, May 4 - Tue, May 6
Delta Logo
7:05 pm - 11:41 pmPDX-ONT
4h 36m1 stop
Delta Logo
2:35 pm - 8:49 pmONT-PDX
6h 14m1 stop
$227Delta
Find Deal
Wed, Apr 30 - Sun, May 4
Southwest Logo
6:25 am - 11:15 amPDX-ONT
4h 50m1 stop
Southwest Logo
6:10 am - 10:15 amONT-PDX
4h 05m1 stop
$232Southwest
Find Deal
Thu, Apr 24 - Mon, Apr 28
United Airlines Logo
3:42 pm - 10:59 pmPDX-ONT
7h 17m1 stop
United Airlines Logo
6:00 am - 12:33 pmONT-PDX
6h 33m1 stop
$275United Airlines
Find Deal
Fri, May 23 - Tue, May 27
Southwest Logo
6:15 pm - 10:25 pmPDX-ONT
4h 10m1 stop
Southwest Logo
5:30 am - 1:35 pmONT-PDX
8h 05m2 stops
$293Southwest
Find Deal
Wed, Jun 18 - Wed, Jun 25

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
May 29
PDX11:04 amPortland
2h 20m
ONT1:24 pmOntario
Jun 2
ONT2:30 pmOntario
2h 25m
PDX4:55 pmPortland
Frontier
May 29
PDX11:04 amPortland
2h 20m
ONT1:24 pmOntario
Jun 2
ONT2:30 pmOntario
2h 25m
PDX4:55 pmPortland
Frontier
Jun 13
PDX11:13 amPortland
2h 22m
ONT1:35 pmOntario
Jun 15
ONT2:30 pmOntario
2h 25m
PDX4:55 pmPortland

Alaska Airlines flights from Portland to Ontario

Our best Alaska Airlines deals on Portland to Ontario flight tickets
Alaska Airlines
May 7
PDX7:00 amPortland
2h 16m
ONT9:16 amOntario
May 10
ONT7:00 amOntario
2h 26m
PDX9:26 amPortland
Alaska Airlines
May 5
PDX9:42 pmPortland
2h 16m
ONT11:58 pmOntario
May 13
ONT7:00 amOntario
2h 26m
PDX9:26 amPortland
Alaska Airlines
Apr 28
PDX9:42 pmPortland
2h 16m
ONT11:58 pmOntario
May 2
ONT8:59 pmOntario
2h 21m
PDX11:20 pmPortland

See travel insights to Los Angeles from

How to get the cheapest flight ticket from Portland 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 Portland to Ontario. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $125. If you aren’t able to travel during the month of September, then book flights to Ontario from Portland during August instead. Flights to Ontario in August, while not as cheap as those in September, still average around $142.

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 $138. 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 Portland to Ontario for around $214.

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

In the afternoon is the cheapest time of day to fly from Portland to Ontario when you can find flight prices for as low as $148. Flying to Ontario in the afternoon 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 evening when prices are $185 on average. Flights to Ontario from Portland in the evening are generally more expensive because this time of day is more convenient for travelers’ schedules.

What is the cheapest Portland to Ontario flight route?

Fly from Portland to Ontario for the best Portland - Ontario flight prices

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

You are more likely to see cheaper flights to Ontario from Portland when booking 5 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $196 when searching 5 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Ontario from Portland for as low as $125 on momondo.

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

There are 3 cabin classes available to choose from on Portland to Ontario flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

How have Portland to Ontario flight prices changed over time?

As of April 2025, prices for Portland to Ontario flights are approximately 70% cheaper when compared to flights at the same time last year.

When to book flights from Portland to Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from Portland to Ontario according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland to Ontario (PDX to ONT) flight deals and tips

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

Best Price Found

$38

Fastest flight time

2h 16m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Portland in the past 72 hours is $38. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $77.
The fastest flight from Portland to Ontario takes 2h 16m
Direct flights go from Portland to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)

  • How far is Portland to Ontario by plane?

    The straight-line distance from Portland to Ontario is 834.5 mi. By plane, this route typically takes 2h 16m.

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

    Prices for flights from Portland Airport to Ontario Airport are refreshed on a daily basis.

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

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

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport 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 Portland to Ontario?

  • What is the most popular airline from Portland to Ontario?


Best airlines flying from Portland to Ontario

Compare and see reviews for airlines that fly from Portland to Ontario with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $55Free CancellationRating
6.0
3,276 reviews
Search Frontier flights
Spirit AirlinesPriceFrom $68Free CancellationRating
6.3
7,886 reviews
Search Spirit Airlines flights
DeltaPriceFrom $138Free CancellationRating
8.0
7,898 reviews
Search Delta flights
Alaska AirlinesPriceFrom $156Free CancellationRating
8.0
9,820 reviews
Search Alaska Airlines flights
United AirlinesPriceFrom $171Free CancellationRating
7.4
8,615 reviews
Search United Airlines flights
Hawaiian AirlinesPriceFrom $177Free CancellationRating
7.9
2,345 reviews
Search Hawaiian Airlines flights
SouthwestPriceFrom $188Free CancellationRating
8.0
4,277 reviews
Search Southwest flights
  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 21 times per week, with 9,823 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Portland to Ontario in the last 72 hours was $156 (round-trip), much lower than the average airfare cost of $278 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.9/10 from 2,345 reviews) operates around 21 flights from Portland to Ontario in any given week. The average Hawaiian Airlines airfare for this route is around $337, with deals from around $177 rare but found on momondo. Referenced prices are for round-trip Portland to Ontario flight searches in the last 72 hours.


Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Portland to Ontario for you.

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

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

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

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Portland to Ontario.

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

Yes. momondo can track prices for Portland to Ontario flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.


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