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Cheap flights from Portland to Los Angeles from $94

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 Los Angeles departing on 12/29. 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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0 bags

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Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
7:10 am - 1:54 pm
PDX
-
ONT
6h 44m1 stop
Delta Logo
6:00 am - 12:25 pm
ONT
-
PDX
6h 25m1 stop
$162Delta
Sat, Feb 28 - Thu, Mar 5
Frontier Logo
2:19 pm - 9:17 pm
PDX
-
ONT
6h 58m1 stop
Frontier Logo
10:18 pm - 9:34 am
ONT
-
PDX
11h 16m1 stop
$163Frontier
Thu, Jan 1 - Thu, Jan 8
American Airlines Logo
8:29 am - 4:05 pm
PDX
-
ONT
7h 36m1 stop
American Airlines Logo
5:06 pm - 12:16 am
ONT
-
PDX
7h 10m1 stop
$166American Airlines
Sun, Feb 8 - Fri, Feb 13
Delta Logo
5:15 pm - 10:51 pm
PDX
-
ONT
5h 36m1 stop
Delta Logo
7:30 am - 6:50 pm
ONT
-
PDX
11h 20m1 stop
$167Delta
Fri, Jan 9 - Sun, Jan 11
Delta Logo
5:50 am - 12:16 pm
PDX
-
ONT
6h 26m1 stop
Delta Logo
3:30 pm - 8:59 pm
ONT
-
PDX
5h 29m1 stop
$168Delta
Thu, Jan 15 - Sat, Jan 17
Alaska Airlines Logo
2:43 pm - 5:03 pm
PDX
-
ONT
2h 20mnonstop
Alaska Airlines Logo
7:00 am - 9:33 am
ONT
-
PDX
2h 33mnonstop
$169Alaska Airlines
Fri, Jan 9 - Sun, Jan 11
Alaska Airlines Logo
10:46 am - 1:06 pm
PDX
-
ONT
2h 20mnonstop
Alaska Airlines Logo
7:56 pm - 6:18 am
ONT
-
PDX
10h 22m1 stop
$170Alaska Airlines
Wed, Jan 14 - Fri, Jan 16
Frontier Logo
6:34 pm - 5:54 pm
PDX
-
ONT
23h 20m1 stop
Frontier Logo
4:34 pm - 10:33 am
ONT
-
PDX
17h 59m1 stop
$171Frontier
Mon, Jan 12 - Thu, Jan 15
Delta Logo
5:15 pm - 11:58 pm
PDX
-
ONT
6h 43m2 stops
Delta Logo
3:30 pm - 8:59 pm
ONT
-
PDX
5h 29m1 stop
$172Delta
Thu, Jan 29 - Sun, Feb 1
Delta Logo
1:30 pm - 11:58 pm
PDX
-
ONT
10h 28m2 stops
Delta Logo
5:00 pm - 11:53 pm
ONT
-
PDX
6h 53m1 stop
$175Delta
Fri, Feb 6 - Fri, Feb 20

Alaska Airlines flights from Portland to Ontario

Our best Alaska Airlines deals on Portland to Ontario flight tickets
Alaska Airlines
Jan 9
PDX2:43 pmPortland
2h 20m
ONT5:03 pmOntario
Jan 11
ONT7:00 amOntario
2h 33m
PDX9:33 amPortland
$169
Find similar
Alaska Airlines
Jan 14
PDX10:46 amPortland
2h 20m
ONT1:06 pmOntario
Jan 16
ONT7:56 pmOntario
10h 22m
1 stop
PDX6:18 amPortland
$170
Find similar
Alaska Airlines
Jan 21
PDX9:10 amPortland
5h 58m
1 stop
ONT3:08 pmOntario
Jan 23
ONT4:03 pmOntario
4h 44m
1 stop
PDX8:47 pmPortland
$176
Find similar

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
Jan 1
PDX2:19 pmPortland
6h 58m
1 stop
ONT9:17 pmOntario
Jan 8
ONT10:18 pmOntario
11h 16m
1 stop
PDX9:34 amPortland
$163
Find similar
Frontier
Jan 12
PDX6:34 pmPortland
23h 20m
1 stop
ONT5:54 pmOntario
Jan 15
ONT4:34 pmOntario
17h 59m
1 stop
PDX10:33 amPortland
$171
Find similar
Frontier
Dec 25
PDX12:47 pmPortland
11h 12m
1 stop
ONT11:59 pmOntario
Jan 14
ONT7:15 amOntario
27h 49m
1 stop
PDX11:04 amPortland
$188
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Portland to Ontario that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 4, 2025.
Use the filters below to find and compare flights from Portland to Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 2/28

7:10 am-1:54 pm

1 stop6h 44m

Ontario

Thu 3/5

6:00 am-12:25 pm

1 stop6h 25m

$162

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 1/1

2:19 pm-9:17 pm

1 stop6h 58m

Ontario

Thu 1/8

10:18 pm-9:34 am

1 stop11h 16m

$163

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 2/8

8:29 am-4:05 pm

1 stop7h 36m

Ontario

Fri 2/13

5:06 pm-12:16 am

1 stop7h 10m

$166

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 1/9

5:15 pm-10:51 pm

1 stop5h 36m

Ontario

Sun 1/11

7:30 am-6:50 pm

1 stop11h 20m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 1/15

5:50 am-12:16 pm

1 stop6h 26m

Ontario

Sat 1/17

3:30 pm-8:59 pm

1 stop5h 29m

$168

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 1/9

2:43 pm-5:03 pm

Nonstop2h 20m

Ontario

Sun 1/11

7:00 am-9:33 am

Nonstop2h 33m

$169

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 1/14

10:46 am-1:06 pm

Nonstop2h 20m

Ontario

Fri 1/16

7:56 pm-6:18 am

1 stop10h 22m

$170

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 1/12

6:34 pm-5:54 pm

1 stop23h 20m

Ontario

Thu 1/15

4:34 pm-10:33 am

1 stop17h 59m

$171

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 1/29

5:15 pm-11:58 pm

2 stops6h 43m

Ontario

Sun 2/1

3:30 pm-8:59 pm

1 stop5h 29m

$172

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 2/6

1:30 pm-11:58 pm

2 stops10h 28m

Ontario

Fri 2/20

5:00 pm-11:53 pm

1 stop6h 53m

$175

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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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, July 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 $168. If you aren’t able to travel during the month of July, then book flights to Ontario from Portland during August instead. Flights to Ontario in August, while not as cheap as those in July, still average around $172.

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 Friday when prices can be found for as low as $177. This is often the case because there is less demand to fly during this day of the week. When flying out on a Wednesday, the most expensive travel day of the week, you can expect to see flight prices from Portland to Ontario for around $287.

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

In the morning is the cheapest time of day to fly from Portland to Ontario when you can find flight prices for as low as $183. Flying to Ontario in the morning is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $286 on average. Flights to Ontario from Portland at noon 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 weeks ahead of your departure date. In general, you can expect to find flights to Ontario for around $231 when searching 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 $157 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 December 2025, prices for Portland to Ontario flights are approximately 46% 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

$108

Fastest flight time

2h 18m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Portland in the past 72 hours is $108. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $204.
The fastest flight from Portland to Ontario takes 2h 18m
Direct flights go from Portland to Ontario every day.
There is 1 airport near Ontario: Ontario (ONT)
Search flight deals

  • 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 18m.

  • 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 $61Free CancellationRating
5.8
3,092 reviews
Search Frontier flights
DeltaPriceFrom $83Free CancellationRating
7.9
8,010 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $98Free CancellationRating
7.8
2,817 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $158Free CancellationRating
7.4
9,066 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $167Free CancellationRating
8.0
11,402 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $173Free CancellationRating
8.0
4,251 reviews
Search Southwest flights

  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 9 times per week, with 11,402 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Portland to Ontario in the last 72 hours was $167 (round-trip), much lower than the average airfare cost of $299 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.8/10 from 2,817 reviews) operates around 14 flights from Portland to Ontario in any given week. The average Hawaiian Airlines airfare for this route is around $238, with deals from around $98 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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