Cheap Flights from Ontario (ONT) to Portsmouth (PSM)

Popular airlines from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth, NH (PSM-Portsmouth Intl.)

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Flights from Ontario (ONT) to Portsmouth (PSM)
Origin airport
Los Angeles - Ontario Intl.
Destination airport
Portsmouth Intl.
Distance
2567 mi

Ontario to Portsmouth Flights

The cheapest times to fly from Ontario to Portsmouth

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from Ontario to Portsmouth are during the month of . You can find some of the cheapest flights from Ontario to Portsmouth with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from Ontario to Portsmouth

Sunday is one of the best days to book for cheap flights from Ontario to Portsmouth: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from Ontario to Portsmouth

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from Ontario to Portsmouth in 2026. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap Ontario to Portsmouth flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your Ontario to Portsmouth airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

Frequently asked questions

How much does a flight from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM) cost?
Grab a cheap one-way flight or cheap return flight from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM)?
Planning your getaway for is a good way to save, as it's the cheapest month for flights between ONT and PSM. You'll usually find the lowest fares during off-peak months.
What is the cheapest airline that flies from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM)?
To find the cheapest airline that'll fly you from ONT to PSM, use Expedia's filter tool. Tailor your search based on what matters most to you, such as preferred carriers and cabin class. You can then sort your results by "Price (lowest to highest)" to see the cheapest flights first.
How many flights per day from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM)?
You'll need to take a flight with a layover when traveling from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM). There are no daily direct flights on this route. However, just filter your search to include one or two stops to discover an option that works for you.
What day of the week has the most flights from ONT to PSM?
Friday is generally the busiest day for flights, while Tuesday tends to be the quietest.* Remember that flight schedules can vary depending on a range of factors, such as the time of year and carrier.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM)?
To land at Portsmouth Intl. Airport (PSM) on schedule, opt for a flight that leaves from Los Angeles - Ontario Intl. Airport (ONT) before 3 PM. The chance of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM) last-minute?
Last-minute bookings from ONT to PSM are usually more expensive. To lock in the cheapest rates, start searching for flights early. That being said, if you're flexible with your travel plans, it's possible to find a cheap fare right before you leave.
Is it cheaper to book an ONT to PSM flight and hotel package?
You can save money by booking an ONT to PSM flight and hotel package compared to booking separately. In fact, you could save hundreds of dollars by bundling with Expedia. And it's easy to manage it all in one convenient place. Once you've selected your preferred flights and accommodations, consider adding extras including activities, tours and car rentals.
Can I cancel or change the date of my flight from Los Angeles - Ontario Intl. Airport (ONT) to Portsmouth Intl. Airport (PSM)?
Typically, you're able to reschedule or cancel your ONT to PSM flight. However, additional fees may apply, especially if your booking was made more than 24 hours ago. Check your itinerary for the airline's policies and fees on flight changes, or if you need more details, head to our Customer Service portal.

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