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Cheap flights from Portland to Los Angeles from $88

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 1/6. 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.
Frontier Logo
12:47 pm - 11:59 pmPDX-ONT
11h 12m1 stop
Frontier Logo
3:26 pm - 10:34 amONT-PDX
19h 08m1 stop
$124Frontier
Find Deal
Thu, Jan 8 - Sun, Jan 11
Frontier Logo
3:59 pm - 11:57 pmPDX-ONT
7h 58m1 stop
Frontier Logo
6:15 am - 9:34 amONT-PDX
27h 19m1 stop
$127Frontier
Find Deal
Mon, Dec 1 - Thu, Dec 4
Frontier Logo
12:51 pm - 2:25 pmPDX-ONT
25h 34m1 stop
Frontier Logo
6:15 am - 9:34 amONT-PDX
27h 19m1 stop
$128Frontier
Find Deal
Thu, Dec 4 - Thu, Dec 11
Alaska Airlines Logo
10:30 am - 12:46 pmPDX-ONT
2h 16mnonstop
Alaska Airlines Logo
7:10 am - 9:41 amONT-PDX
2h 31mnonstop
$151Alaska Airlines
Find Deal
Tue, Dec 9 - Tue, Dec 16
Alaska Airlines Logo
5:45 pm - 8:03 pmPDX-ONT
2h 18mnonstop
Alaska Airlines Logo
7:10 am - 9:41 amONT-PDX
2h 31mnonstop
$156Alaska Airlines
Find Deal
Wed, Dec 10 - Sat, Dec 13
Hawaiian Airlines Logo
5:45 pm - 8:03 pmPDX-ONT
2h 18mnonstop
Hawaiian Airlines Logo
7:10 am - 9:41 amONT-PDX
2h 31mnonstop
$161Hawaiian Airlines
Find Deal
Sat, Dec 13 - Sun, Dec 14
Delta Logo
5:25 pm - 9:55 pmPDX-ONT
4h 30m1 stop
Delta Logo
5:49 pm - 12:15 amONT-PDX
6h 26m1 stop
$167Delta
Find Deal
Sat, Dec 13 - Tue, Dec 16
Hawaiian Airlines Logo
5:45 pm - 8:03 pmPDX-ONT
2h 18mnonstop
Hawaiian Airlines Logo
7:10 am - 9:41 amONT-PDX
2h 31mnonstop
$174Hawaiian Airlines
Find Deal
Sat, Dec 13 - Sun, Dec 14
Southwest Logo
7:15 am - 2:15 pmPDX-ONT
7h 00m1 stop
Southwest Logo
5:25 pm - 9:25 pmONT-PDX
4h 00m1 stop
$184Southwest
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Mon, Dec 8 - Wed, Dec 10
Delta Logo
7:09 pm - 11:58 pmPDX-ONT
4h 49m1 stop
Delta Logo
4:49 pm - 12:04 amONT-PDX
7h 15m1 stop
$187Delta
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Thu, Dec 4 - Mon, Dec 8

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
Jan 8
PDX12:47 pmPortland
11h 12m
1 stop
ONT11:59 pmOntario
Jan 11
ONT3:26 pmOntario
19h 08m
1 stop
PDX10:34 amPortland
$124
Find similar
Frontier
Nov 18
PDX1:26 pmPortland
8h 01m
1 stop
ONT9:27 pmOntario
Nov 23
ONT12:29 pmOntario
2h 35m
PDX3:04 pmPortland
$125
Find similar
Frontier
Dec 1
PDX3:59 pmPortland
7h 58m
1 stop
ONT11:57 pmOntario
Dec 4
ONT6:15 amOntario
27h 19m
1 stop
PDX9:34 amPortland
$127
Find similar

Alaska Airlines flights from Portland to Ontario

Our best Alaska Airlines deals on Portland to Ontario flight tickets
Alaska Airlines
Dec 9
PDX10:30 amPortland
2h 16m
ONT12:46 pmOntario
Dec 16
ONT7:10 amOntario
2h 31m
PDX9:41 amPortland
$151
Find similar
Alaska Airlines
Dec 10
PDX5:45 pmPortland
2h 18m
ONT8:03 pmOntario
Dec 13
ONT7:10 amOntario
2h 31m
PDX9:41 amPortland
$156
Find similar
Alaska Airlines
Dec 9
PDX10:30 amPortland
2h 16m
ONT12:46 pmOntario
Dec 13
ONT7:10 amOntario
2h 31m
PDX9:41 amPortland
$157
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 November 12, 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

Thu 1/8

12:47 pm-11:59 pm

1 stop11h 12m

Ontario

Sun 1/11

3:26 pm-10:34 am

1 stop19h 08m

$124

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 12/1

3:59 pm-11:57 pm

1 stop7h 58m

Ontario

Thu 12/4

6:15 am-9:34 am

1 stop27h 19m

$127

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

12:51 pm-2:25 pm

1 stop25h 34m

Ontario

Thu 12/11

6:15 am-9:34 am

1 stop27h 19m

$128

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 12/9

10:30 am-12:46 pm

Nonstop2h 16m

Ontario

Tue 12/16

7:10 am-9:41 am

Nonstop2h 31m

$151

PortlandOntario

PDX - ONT

PDXONT

Portland

Wed 12/10

5:45 pm-8:03 pm

Nonstop2h 18m

Ontario

Sat 12/13

7:10 am-9:41 am

Nonstop2h 31m

$156

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/13

5:45 pm-8:03 pm

Nonstop2h 18m

Ontario

Sun 12/14

7:10 am-9:41 am

Nonstop2h 31m

$161

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/13

5:25 pm-9:55 pm

1 stop4h 30m

Ontario

Tue 12/16

5:49 pm-12:15 am

1 stop6h 26m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 12/13

5:45 pm-8:03 pm

Nonstop2h 18m

Ontario

Sun 12/14

7:10 am-9:41 am

Nonstop2h 31m

$174

PortlandOntario

PDX - ONT

PDXONT

Portland

Mon 12/8

7:15 am-2:15 pm

1 stop7h 00m

Ontario

Wed 12/10

5:25 pm-9:25 pm

1 stop4h 00m

$184

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 12/4

7:09 pm-11:58 pm

1 stop4h 49m

Ontario

Mon 12/8

4:49 pm-12:04 am

1 stop7h 15m

$187

Flights are sorted by cheapest round-trip flights 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 $176. 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 $286.

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 $181. 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 in the afternoon when prices are $283 on average. Flights to Ontario from Portland in the afternoon 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 $230 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 $154 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 November 2025, prices for Portland to Ontario flights are approximately 31% 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

$117

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 $117. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $177.
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)
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 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 $64Free CancellationRating
5.8
3,113 reviews
Search Frontier flights
DeltaPriceFrom $93Free CancellationRating
7.9
8,008 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $98Free CancellationRating
7.8
2,806 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $158Free CancellationRating
7.4
9,015 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $167Free CancellationRating
8.0
11,275 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $173Free CancellationRating
8.0
4,235 reviews
Search Southwest flights

  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 14 times per week, with 11,275 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 $301 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.8/10 from 2,809 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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