$154 Find Cheap Flights from Los Angeles to Portsmouth

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 9/13. 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
$268
Typical prices: $518-$297
United Airlines
Mon 5/18Sat 5/23
LAX - BOS • Non-stop
Cheapest one-way
$154
Typical prices: $149-$328
JetBlue
Sun 9/13
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

Mon, May 18 - Sat, May 23
United Airlines Logo
10:43 pm - 7:24 am
LAX
-
BOS
5h 41mnonstop
United Airlines Logo
6:26 pm - 9:51 pm
BOS
-
LAX
6h 25mnonstop
$268United Airlines
Tue, May 19 - Sat, May 23
Multiple Airlines Logo
3:28 pm - 8:44 am
LAX
-
BOS
14h 16m
1 stop
Multiple Airlines Logo
3:55 pm - 7:18 pm
BOS
-
LAX
6h 23mnonstop
$269Multiple Airlines
Thu, Jul 16 - Sat, Jul 25
Frontier Logo
10:59 am - 1:23 am
LAX
-
BOS
11h 24m
1 stop
Frontier Logo
6:00 am - 5:16 pm
BOS
-
LAX
14h 16m
1 stop
$270Frontier
Fri, May 29 - Thu, Jun 4
Frontier Logo
3:28 pm - 7:49 am
LAX
-
BOS
13h 21m
1 stop
Frontier Logo
6:21 am - 9:35 am
BOS
-
LAX
6h 14mnonstop
$271Frontier
Fri, May 29 - Fri, Jun 5
JetBlue Logo
10:09 pm - 6:45 am
LAX
-
BOS
5h 36mnonstop
JetBlue Logo
6:02 am - 9:31 am
BOS
-
LAX
6h 29mnonstop
$272JetBlue
Thu, Jul 9 - Mon, Jul 13
Southwest Logo
5:10 am - 11:25 pm
LAX
-
BOS
15h 15m
2 stops
Southwest Logo
5:20 pm - 12:05 am
BOS
-
LAX
9h 45m
2 stops
$273Southwest
Sat, May 30 - Thu, Jun 4
Multiple Airlines Logo
3:28 pm - 7:49 am
LAX
-
BOS
13h 21m
1 stop
Multiple Airlines Logo
5:40 pm - 9:06 pm
BOS
-
LAX
6h 26mnonstop
$274Multiple Airlines
Tue, May 12 - Wed, Jun 3
Frontier Logo
3:28 pm - 8:44 am
LAX
-
BOS
14h 16m
1 stop
Frontier Logo
6:00 am - 2:15 pm
BOS
-
LAX
11h 15m
1 stop
$275Frontier
Sat, May 30 - Tue, Jun 2
Southwest Logo
5:40 am - 9:25 pm
LAX
-
BOS
12h 45m
1 stop
Southwest Logo
2:25 pm - 9:20 pm
BOS
-
LAX
9h 55m
1 stop
$277Southwest
Tue, May 19 - Sat, May 23
United Airlines Logo
11:53 pm - 11:01 am
LAX
-
BOS
8h 08m
1 stop
United Airlines Logo
6:26 pm - 9:51 pm
BOS
-
LAX
6h 25mnonstop
$278United Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$154
Best time to beat the crowds with an average 28% drop in price.
Most popular time to fly with an average 14% 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 27m.

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

    59 direct flights run between Los Angeles and Portsmouth on a daily basis. On average, there are about 413 departures each week.

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

    Consider leaving on a Friday and avoid Wednesdays 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 72 hours, the cheapest one-way ticket between Los Angeles and Portsmouth found on KAYAK was with Frontier for $74. Spirit Airlines offered a round-trip connection from $99 and Frontier from $113.

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 32 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 March, April and May. 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 4305 reviews
8.0Comfort
8.6Crew
7.5Entertainment
7.0Food
8.1Boarding
Airline reviews

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

10.0 Excellentlarry, Apr 2026
LGB - PHX
Read more Southwest reviews

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

The problem with the seat assignments is that there were a lot of rows in the front that were empty but my row at the back was full. Just not so pleasant.

Good but I prefer choose your own seat. With the new assigned seats they should board from the back I see no advantage to this new boarding. Just like every other airline

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!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

Booked through Kayak Business, had a seat in middle and towards back due to booking rate, not comfortable.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

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.

It was a red-eye, but the flight felt surprisingly quick. The seats were very comfortable, and that made resting much easier. I also want to thank the gentleman seated next to me, who graciously moved so my mom could sit beside me. We slept almost the entire way. The cabin crew was respectful in not disturbing us, while also being courteous and professional throughout. Thank you, United.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

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.

OK, we were delayed and had to de plane and reboard.

Given us a free miles or free flight for waiting for 9 hours I didn’t get home till 5am in the morning and I was supposed to be home at 9:30 touch down.

Excellent price. Everything on time. two bad parts. Kayak said I couldn't sign in for the flight online, but I got an email at the same time from Jet Blue and they let me sign in online. Second bad part was that, although I had provided my known traveler number, neither of my boarding passes, for this flight and the previous one, had TSA pre-check showing.

Jet blue was great But the Jayak system Wasa pure nightmare and wasted so much of my time and energy by not giving me a way to access jet blue to check in the flight back I didn’t even get the number confirmation code 24 hours before. Because I didn’t receive the email with the confirmation code I could NoT CHECk IN. I spoke to a kayak third party and they informed me I could not carry a carry on, on the flight which caused me so much extra stress it was just too much. You can be sure I will not be using it recommending your site. Again.

There was a screen but no earphones that could use the older input so I could listen to anything.

My experience with JetBlue was fine BUT I am very upset with Kayak! JetBlue had delayed our scheduled departure by an hour and you NEVER notified me of the change. I did not hear directly from JetBlue because the trip was booked through Kayak, a mistake I will not repeat. Your reminder of the our trip last week still had the WRONG departure time. Our return trip has also changed, and again no notice from you.

Jet blue just had great service overall! Only a little turbulence heading out of Austin, otherwise the jet stream helped the speed of the trip!

Boarding was quick and efficient. The flight crew were friendly. There were limited food options available on the flight. The pocket guide said there would be salad and sandwich sections available on flights over 3.5 hours. The only food available were snack boxes. And those were limited as well. My flight was over 5 hours. The entertainment system worked well. I had both extra legroom seats and regular coach seats. The seats were not very comfortable. The entertainment controls in the armrest made it difficult to rest my arm without changing the channel on my neighbors TV. Overall, my experience was mediocre.

Purchased through 3rd party vendor which made everything difficult. Unable to check in online. Unable to get flight updates easily, tsa precheck information didn’t carry through, longer time to check in in person. Entertainment looked good but had to purchase conventional headphones to view.

Boarding was fast, easy, and we landed early. The entertainment system was very buggy and kept resetting throughout the flight.

Not having an assigned seat until boarding and then having to check my bag.

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 business class layout of chairs was weired. You are sitting directly across stranger.,

Friendly crew is the only nice thing. Seats uncomfortable. Food and snacks horrible. Movies were the same as the first 10 hour flight two weeks before

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

I cancelled my ticket less than 24 hours deadline but I didn’t get refunded.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The flight itself was excellent but the gate attendant made me check my carryon since she said it was an inch too big. I’ve had no problems with this carryon on recent flights on Qantas, Delta, Austrian, Southwest Airlines even though the overhead bins are the same size. there were other carryons in the bins that also looked larger than mine and there was room left in the bins for more. When I picked up my carryon from baggage claim one of the wheels had broken off.

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