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Cheap flights from Portland to Los Angeles from $64

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 9/22. 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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Find the cheapest flights from Portland to Los Angeles

Cheap round-trip flights

Frontier Logo
7:30 pm - 9:52 pmPDX-ONT
2h 22mnonstop
Frontier Logo
8:25 am - 10:51 amONT-PDX
2h 26mnonstop
$66Frontier
Find Deal
Fri, Oct 17 - Sun, Oct 26
Frontier Logo
7:30 pm - 9:52 pmPDX-ONT
2h 22mnonstop
Frontier Logo
8:25 am - 10:51 amONT-PDX
2h 26mnonstop
$67Frontier
Find Deal
Fri, Oct 17 - Sun, Oct 19
Frontier Logo
7:30 pm - 9:52 pmPDX-ONT
2h 22mnonstop
Frontier Logo
8:25 am - 10:51 amONT-PDX
2h 26mnonstop
$75Frontier
Find Deal
Sun, Oct 12 - Sun, Oct 19
Frontier Logo
7:17 pm - 9:38 pmPDX-ONT
2h 21mnonstop
Frontier Logo
8:07 am - 10:33 amONT-PDX
2h 26mnonstop
$83Frontier
Find Deal
Fri, Sep 26 - Sun, Sep 28
Logo
7:30 pm - 9:52 pmPDX-ONT
2h 22mnonstop
Logo
5:45 pm - 8:03 pmONT-PDX
2h 18mnonstop
$150
Find Deal
Fri, Oct 17 - Tue, Oct 21
Delta Logo
7:22 pm - 11:59 pmPDX-ONT
4h 37m1 stop
Delta Logo
5:49 pm - 10:37 pmONT-PDX
4h 48m1 stop
$151Delta
Find Deal
Tue, Dec 2 - Sat, Dec 6
Logo
9:32 pm - 11:56 pmPDX-ONT
2h 24mnonstop
Logo
12:05 pm - 2:31 pmONT-PDX
2h 26mnonstop
$154
Find Deal
Thu, Oct 30 - Sun, Nov 2
Southwest Logo
5:40 am - 12:50 pmPDX-ONT
7h 10m2 stops
Southwest Logo
3:15 pm - 7:55 pmONT-PDX
4h 40m1 stop
$156Southwest
Find Deal
Sat, Nov 15 - Mon, Nov 17
Delta Logo
5:55 am - 12:34 pmPDX-ONT
6h 39m1 stop
Delta Logo
5:05 pm - 11:54 pmONT-PDX
6h 49m1 stop
$167Delta
Find Deal
Tue, Feb 24 - Thu, Feb 26
Alaska Airlines Logo
2:46 pm - 5:05 pmPDX-ONT
2h 19mnonstop
Alaska Airlines Logo
10:59 am - 1:25 pmONT-PDX
2h 26mnonstop
$177Alaska Airlines
Find Deal
Sat, Nov 8 - Wed, Nov 12

Frontier flights from Portland to Ontario

Our best Frontier deals on Portland to Ontario flight tickets
Frontier
Oct 17
PDX7:30 pmPortland
2h 22m
ONT9:52 pmOntario
Oct 26
ONT8:25 amOntario
2h 26m
PDX10:51 amPortland
$66
Find similar
Frontier
Oct 17
PDX7:30 pmPortland
2h 22m
ONT9:52 pmOntario
Oct 19
ONT8:25 amOntario
2h 26m
PDX10:51 amPortland
$67
Find similar
Frontier
Oct 12
PDX7:30 pmPortland
2h 22m
ONT9:52 pmOntario
Oct 19
ONT8:25 amOntario
2h 26m
PDX10:51 amPortland
$75
Find similar

Delta flights from Portland to Ontario

Our best Delta deals on Portland to Ontario flight tickets
Delta
Dec 2
PDX7:22 pmPortland
4h 37m
1 stop
ONT11:59 pmOntario
Dec 6
ONT5:49 pmOntario
4h 48m
1 stop
PDX10:37 pmPortland
$151
Find similar
Delta
Feb 24
PDX5:55 amPortland
6h 39m
1 stop
ONT12:34 pmOntario
Feb 26
ONT5:05 pmOntario
6h 49m
1 stop
PDX11:54 pmPortland
$167
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 September 16, 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

Fri 10/17

7:30 pm-9:52 pm

Nonstop2h 22m

Ontario

Sun 10/26

8:25 am-10:51 am

Nonstop2h 26m

$66

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 10/17

7:30 pm-9:52 pm

Nonstop2h 22m

Ontario

Sun 10/19

8:25 am-10:51 am

Nonstop2h 26m

$67

PortlandOntario

PDX - ONT

PDXONT

Portland

Sun 10/12

7:30 pm-9:52 pm

Nonstop2h 22m

Ontario

Sun 10/19

8:25 am-10:51 am

Nonstop2h 26m

$75

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 9/26

7:17 pm-9:38 pm

Nonstop2h 21m

Ontario

Sun 9/28

8:07 am-10:33 am

Nonstop2h 26m

$83

PortlandOntario

PDX - ONT

PDXONT

Portland

Fri 10/17

7:30 pm-9:52 pm

Nonstop2h 22m

Ontario

Tue 10/21

5:45 pm-8:03 pm

Nonstop2h 18m

$150

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 12/2

7:22 pm-11:59 pm

1 stop4h 37m

Ontario

Sat 12/6

5:49 pm-10:37 pm

1 stop4h 48m

$151

PortlandOntario

PDX - ONT

PDXONT

Portland

Thu 10/30

9:32 pm-11:56 pm

Nonstop2h 24m

Ontario

Sun 11/2

12:05 pm-2:31 pm

Nonstop2h 26m

$154

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 11/15

5:40 am-12:50 pm

2 stops7h 10m

Ontario

Mon 11/17

3:15 pm-7:55 pm

1 stop4h 40m

$156

PortlandOntario

PDX - ONT

PDXONT

Portland

Tue 2/24

5:55 am-12:34 pm

1 stop6h 39m

Ontario

Thu 2/26

5:05 pm-11:54 pm

1 stop6h 49m

$167

PortlandOntario

PDX - ONT

PDXONT

Portland

Sat 11/8

2:46 pm-5:05 pm

Nonstop2h 19m

Ontario

Wed 11/12

10:59 am-1:25 pm

Nonstop2h 26m

$177

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, October 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 $161. If you aren’t able to travel during the month of October, then book flights to Ontario from Portland during July instead. Flights to Ontario in July, while not as cheap as those in October, still average around $168.

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 $166. 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 $251.

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 $173. 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 $258 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 $222 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 $156 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 September 2025, prices for Portland to Ontario flights are approximately 0% more expensive 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

$89

Fastest flight time

2h 10m

Direct flights

Every day

Airports in Ontario

1 airport
The best one-way flight to Ontario from Portland in the past 72 hours is $89. The best round-trip flight deal from Portland to Ontario found on momondo in the last 72 hours is $117.
The fastest flight from Portland to Ontario takes 2h 10m
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 10m.

  • 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 $63Free CancellationRating
5.8
3,172 reviews
Search Frontier flights
DeltaPriceFrom $93Free CancellationRating
7.9
7,954 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $98Free CancellationRating
7.8
2,723 reviews
Search Hawaiian Airlines flights
United AirlinesPriceFrom $158Free CancellationRating
7.4
8,929 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $161Free CancellationRating
8.0
10,000 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $173Free CancellationRating
8.0
4,242 reviews
Search Southwest flights

  • Alaska Airlines Flights From Portland to Ontario

    Alaska Airlines flies from Portland to Ontario around 18 times per week, with 10,000 momondo users rating the airline 8.0/10. The cheapest Alaska Airlines deal from Portland to Ontario in the last 72 hours was $161 (round-trip), much lower than the average airfare cost of $290 for Alaska Airlines flights on this route.

  • Hawaiian Airlines Flights From Portland to Ontario

    Hawaiian Airlines (7.8/10 from 2,723 reviews) operates around 18 flights from Portland to Ontario in any given week. The average Hawaiian Airlines airfare for this route is around $243, 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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