$156 Find Cheap Flights from Los Angeles to Portsmouth - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Los Angeles to Portsmouth departing on 7/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$276
Typical prices: $287-$501
Southwest
Tue 8/18Wed 9/2
LAX - BOS • 2 stops
Cheapest non-stop
$277
Typical prices: $379-$589
United Airlines
Sun 7/12Wed 7/22
LAX - BOS • Non-stop
Arrival airport
You can't fly directly to Portsmouth. It is served by Boston (BOS), located 50.3 miles from Portsmouth.
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Los Angeles to Portsmouth (LAX-BOS)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Los Angeles to Portsmouth that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Los Angeles to Portsmouth

Tue, Aug 18 - Wed, Sep 2
Southwest Logo
12:50 am - 4:55 pm
LAX
-
BOS
13h 05m
2 stops
Southwest Logo
5:50 pm - 11:35 pm
BOS
-
LAX
8h 45m
1 stop
$276Southwest
Sun, Jul 12 - Wed, Jul 22
United Airlines Logo
11:04 pm - 7:45 am
LAX
-
BOS
5h 41mnonstop
United Airlines Logo
6:21 am - 9:35 am
BOS
-
LAX
6h 14mnonstop
$277United Airlines
Tue, Aug 18 - Thu, Aug 20
JetBlue Logo
11:59 pm - 11:33 am
LAX
-
BOS
8h 34m
1 stop
JetBlue Logo
3:55 pm - 7:06 pm
BOS
-
LAX
6h 11mnonstop
$278JetBlue
Mon, Aug 10 - Wed, Aug 19
Southwest Logo
5:00 am - 4:10 pm
LAX
-
BOS
8h 10m
1 stop
Southwest Logo
4:45 pm - 10:25 pm
BOS
-
LAX
8h 40m
1 stop
$279Southwest
Sun, Sep 6 - Sun, Sep 6
JetBlue Logo
8:00 am - 4:40 pm
LAX
-
BOS
5h 40mnonstop
JetBlue Logo
7:09 pm - 12:52 am
BOS
-
LAX
8h 43m
1 stop
$280JetBlue
Mon, Aug 10 - Wed, Aug 19
Southwest Logo
12:50 am - 4:55 pm
LAX
-
BOS
13h 05m
2 stops
Southwest Logo
8:15 am - 3:55 pm
BOS
-
LAX
10h 40m
2 stops
$281Southwest
Thu, Sep 24 - Wed, Sep 30
American Airlines Logo
3:00 pm - 11:28 pm
LAX
-
BOS
5h 28mnonstop
American Airlines Logo
10:30 am - 1:51 pm
BOS
-
LAX
6h 21mnonstop
$282American Airlines
Wed, Jul 29 - Wed, Aug 26
JetBlue Logo
1:55 pm - 10:36 pm
LAX
-
BOS
5h 41mnonstop
JetBlue Logo
12:44 pm - 7:25 pm
BOS
-
LAX
9h 41m
1 stop
$283JetBlue
Mon, Aug 10 - Wed, Aug 19
Southwest Logo
10:00 pm - 9:55 am
LAX
-
BOS
8h 55m
2 stops
Southwest Logo
7:30 am - 2:35 pm
BOS
-
LAX
10h 05m
1 stop
$284Southwest
Wed, Dec 9 - Mon, Dec 14
Southwest Logo
6:40 am - 4:45 pm
LAX
-
BOS
7h 05m
1 stop
Southwest Logo
5:35 am - 1:20 pm
BOS
-
LAX
10h 45m
2 stops
$285Southwest
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$156
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 17% increase in price.
Flight from Los Angeles to Boston

When to book flights from Los Angeles to Portsmouth

Are your dates flexible? Find out the best times to travel from Los Angeles to Portsmouth based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price

Flights from Los Angeles to Portsmouth: the best tips from KAYAK users' own experiences

Insights shared by verified travelers who flew the route from Los Angeles to Portsmouth 
alyciaFlew with American Airlines
LAX
-
BOS
Mar 2026
Switching terminals in Boston was a VERY long walk -- dont cut your connection close if you are going from B to E
NicoleFlew with JetBlue
LAX
-
BOS
Apr 2026
Bring your own snacks/food. Extra legroom is nice but not really worth the extra money, unless you want free alcohol.

FAQs for booking flights from Los Angeles to Portsmouth

  • Which airports will I be using when flying from Los Angeles to Portsmouth?

    When flying out of Los Angeles you’ll be using Los Angeles. Portsmouth does not have its own airport so you’ll be flying into nearby Boston Logan Intl airport, which is 50.3 mi away.

  • How long does a flight from Los Angeles to Portsmouth take?

    Direct flights cover the 2,604 miles separating Los Angeles and Portsmouth in about 5h 28m.

  • How many flights are there between Los Angeles and Portsmouth?

    56 direct flights run between Los Angeles and Portsmouth on a daily basis. On average, there are about 398 departures each week.

  • What’s the cheapest day of the week to fly between Los Angeles and Portsmouth?

    Consider leaving on a Tuesday and avoid Saturdays if you are looking for the best rates. For your return to Los Angeles, you’ll find the best rates on Thursdays and the most expensive ones on Sundays.

  • How does KAYAK find such low prices on flights from Los Angeles to Portsmouth?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Los Angeles to Portsmouth.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Los Angeles to Portsmouth?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portsmouth from Los Angeles is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Los Angeles to Portsmouth?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Portsmouth with an airline and back to Los Angeles with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Los Angeles to Portsmouth?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Portsmouth from Los Angeles up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from Los Angeles to Portsmouth?

    In the last 5 days, the cheapest one-way ticket between Los Angeles and Portsmouth found on KAYAK was with Frontier for $73. Frontier offered a round-trip connection from $111 and Alaska Airlines from $127.

Top tips for finding cheap flights from Los Angeles to Portsmouth

  • There is no airport in Portsmouth. Instead, you’ll be flying into Boston Logan Airport when flying between Los Angeles and Portsmouth.
  • The cheapest flight from Los Angeles to Portsmouth was found 85 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be May, June and July. The cheapest month to fly is January.

Reviews of the top 5 airlines serving Los Angeles to Portsmouth

 
Need help choosing which airline to fly with from Los Angeles to Portsmouth? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
SouthwestOverall score based on 4242 reviews
8.0Comfort
7.0Food
8.1Boarding
7.5Entertainment
8.6Crew
Airline reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

4.0 OkaySteven, Jun 2026
ONT - LAS
Read more Southwest reviews

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Was fine, delayed and feels like southwest is always late

The entire experience from boarding to landing was amazing! The crew were very friendly. Will definitely be back.

Delayed flight, lack of information, boarding process is a mess as is the carryon luggage causing issues when leaving the plane….just a poor experience.

Comfortable. Easy. No problems. Just wish they had gf options for snacks.

The crew was very kind and made going to Hawaii relaxing and fun to look forward to! Thank you Southwest for a pleasant flight!

Terrible. Even though there’s assigned seating now, they are still the slowest boarding airline of anyone.

It was good from LAX to Phoenix, But the connection in Phoenix to Tulsa was not that great. The staff on both flights were great. The choice of free entertainment was ok nothing to brag about. The 45 min delay because of some electrical issue wasn't great from Phoenix to Tulsa. We sat there with hardly any air, The seat I had was between windows so the side of the plane pushed in on you. My being a bigger man it then made the seating area uncomfortable. The seats on the plane had no power to connect to recharge your phone or anything. I would recommend that they should look into a slot or clamp to hold your phone to enjoy while watching the entertainment choices hands-free. Also make it possible to raise the inner seat by the window be able to raise the arm rest up to make more room for larger people to set more comfortably. I would also say other then that stop price gouging the airfare or nickel and diming everything. Not fair for people having to fly for emergencies and be paying for higher prices due to the season or holidays. Your making your money either way and the cost of flying is still going to be the same regardless if there's 100 people or 200 people.

Southwest was greaat! The most expensive but the least upsetting for those we were flying to see.

Boarding was easy. The seats are small and fairly uncomfortable

Very good flight. Crew was great. No issues and we even arrived early.

Be on time? When not on time a circling for over an hour offer more than 1 bag of chips to the passengers? It was a 7 hour flight by the time we got done.

Flight delayed four separate times. I’m now one hour hours late to landing.

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Long story short, it was one of the better flight experiences I've had in some time when compared with other airlines.

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Lost one piece of luggage even though I checked in 2.5 hours before the flight

The boarding process on the departure from LA was rather slow even though I was in Group 1. For first class, I was not expecting to have to pay for Wi-fi but I did and then the wi-fi was spotty. The entree was surprisingly good and so that was a pleasant surprise. However, once I got to Houston, it was terrible. Unfortunately there was bad weather but the constant gate changes for my connecting flight was difficult to manage due to having to navigate back and forth between different terminals.

I was promised by United Airline (operated by ANA) that I will be seated together with my kids as I am the only adult flying with two minors. We did not get seats together in our 11 hours flight from LA to Tokyo. When asked at the gate, ANA representative said United Airline should have informed them that there is a parent flying with two minors. He said they can’t do anything in the system as the flight is full. He ask me to ask passengers next to me and the kids if they are willing to change seats. This is ridiculous! However, I went in the flight and asked other passages but no one willing to change seats. 11 hours and we were seating separately. I was very disappointed with this. It made things super inconvenient for me.

Service was professional and quick. Premium economy seat was comfortable given the class

The staff was extremely helpful and friendly at all times! They went above and beyond to get us into an earlier flight in San Diego to make our connection in SFO possible, because our original flight did actually not make it! I did so much appreciate the UA team and how they made this possible. We also didn’t have seats together on the long flight to Singapore, but they found us seats together last moment with no additional cost! Nobody sat next to us, so that we were able to sleep! Thanks to UA for improving their service and Underpricer for booking this trip! Please be careful: 1,5 hrs for transfer in San Francisco might not be enough time in the future

Flight was delayed but more than 90 minutes. This caused me to miss my available windows for pick-up by a friend. I had to pay $125 for an uber back home from the airport which was an added expense that I had not budgeted for my trip. Staff was friendly.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

The business class seat is exceptional. I wish the food is more palatable.

My flight was canceled a few hours before boarding. I was rebooked on Copa airlines and missed an important meeting .

Business class seats felt very cramped compared to other airlines.

Luggage did not make it onto my plane. Business seats were economy with empty row seat. Just horrible experience. Why would the company allow for transfers that don’t give employees enough time to transfer luggages??

The gate experience at LAX was abysmal (same for the arrival experience two days prior). Despite the LAX -> SAT schedule of two flights daily, our departure gate was at a smaller hub that we had to be bussed to from Terminal 4. Fortunately, I arrived at LAX extra early and had time to spare, but if I had not known, I might have missed my flight. I looked at the LAX airport map in the AA app and there was no indication of the additional boarding process. Lastly the gate area we were bussed to was crowded with limited food and beverage options. On flight, the fight attendant was hospitable and attentive, the flight was smooth, and AA's free (and working) wifi for AA members were all on the positive side.

Our flight from JFK to Madrid was delayed. We had to go from one side of the Madrid airport (Terminal 4s to the far end of terminal 4 - Gate K98) to our gate in less than 30 minutes. Put passport control and security/baggage check and that’s very hard unless you’re Usain Bolt. I called Iberia Airlines and the telephone customer service told me that I was going to have to pay to re-book. Luckily the help desk in the airport (who was dealing with dozens of people from the same JFK-Madrid flight) did not charge us extra to reschedule to a flight 8 hours later. They also gave us a voucher for breakfast and lunch. Glad the actual person at the airport had some actual sense.

For an long range economy flight I feel more space and more meal options need to be offered for flights over 5 hours

The flight from LA to Chicago was smooth and service was very good overall.

It's a long flight and that is always difficult. I was comfortable and well. The movies available were great and the crew was good.

The crew was very attentive through out the flight. Seats were comfortable, nice flight bag with pillow and blanket. Food was okay, since it was a overnight flight seemed to go by fast.

Left early arrived early..right amount of talking from pilots..of course had to love the biscuit and water!

Boarding gate at LAX was too crowded—two gates next to one another

On time departure and early arrival. Flight attendant very nice.

The flight was delayed 14 hours and communication was very poor. No one seemed to know what was happening and the gate agent was trying to help people for several flights. She was by herself trying to help 100s of people.

Domestic flights are good. Just stay away from international travel

Flight left 2 hours late with no explanation as to the delay

The aircraft was fine, it’s was just the service. The flight got canceled several times and that was very inconvenient for my 69 years old mom.

My checked in luggage cost was $59, almost ticket price. The first 13 rows were empty, but fly attendant did not alow women with little boy change her middle sit, sweet boy was crying, I am so sorry for mother and passengers. At the end of the flight the cabin became impossible cold. Only good was timing of departure and early landing, but it suppose to be normal.

I tried to book a flight with Jet Blue. Your third party company hijacked my attempt with a website that looked like I was booking with Jet Blue. I realized it when I paid. I tried to cancel and was told by a man in India that there were no refunds. $735 stolen, Thanks Kayak!

It was inexplicably canceled and we are stuck in LA, haven't gotten home and it has been an inconvenience having lost work (on unpaid leave for my husband).

JetBlue worker, Blythe, was so amazing at the DCA counter. If it wasn’t for her, I’m not sure we would’ve made it through. Please thank her!

They lost my luggage and refuse to help. Terrible airline. I've never experienced worse customer service in my life. Pretty much just told me too bad that I lost all my luggage, not caring that I am stuck in Europe for 2 weeks with absolutely nothing.

You should have had Wifi to make it much enjoyable.

Everything you need to know for your flight from Los Angeles to Portsmouth

Complete your trip to Portsmouth with a hotel stay or car rental