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Cheap flights from Portsmouth to Boise from £850

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/5. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
16 Mar — 23 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Boise

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Boise
Explore the most affordable flight options available from Portsmouth to Boise. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 14 February 2026.

Mon 31/809:05
SOU
-
BOI
2 stops40h 30m
Delta
Wed 30/914:45
BOI
-
SOU
2 stops19h 05m
Delta
Deal found 12/2£850
Thu 3/909:05
SOU
-
BOI
2 stops18h 13m
Delta
Tue 29/919:30
BOI
-
SOU
2 stops38h 20m
Delta
Deal found 12/2£880
Sun 3/517:20
SOU
-
BOI
2 stops29h 54m
Delta
Thu 21/520:55
BOI
-
SOU
2 stops52h 50m
Delta
Deal found 12/2£886
Fri 1/517:20
SOU
-
BOI
2 stops29h 54m
Delta
Wed 20/508:59
BOI
-
SOU
2 stops40h 36m
Delta
Deal found 12/2£897
Sun 30/809:15
SOU
-
BOI
2 stops44h 49m
Delta
Sun 27/916:50
BOI
-
SOU
2 stops41h 00m
Delta
Deal found 12/2£910
Sat 2/509:15
SOU
-
BOI
2 stops19h 09m
Delta
Thu 21/520:55
BOI
-
SOU
2 stops52h 50m
Delta
Deal found 12/2£917
Sat 2/509:15
SOU
-
BOI
2 stops19h 09m
Delta
Fri 15/512:16
BOI
-
SOU
2 stops21h 34m
Delta
Deal found 12/2£927
Fri 1/517:20
SOU
-
BOI
2 stops29h 54m
Delta
Thu 21/520:55
BOI
-
SOU
2 stops52h 50m
Delta
Deal found 12/2£933
Sat 2/509:15
SOU
-
BOI
2 stops20h 45m
Delta
Tue 2/615:23
BOI
-
SOU
2 stops58h 12m
Delta
Deal found 12/2£940
Fri 1/517:20
SOU
-
BOI
2 stops29h 54m
Delta
Fri 15/512:16
BOI
-
SOU
2 stops21h 34m
Delta
Deal found 12/2£944
Sun 3/517:20
SOU
-
BOI
2 stops29h 54m
Delta
Fri 29/512:16
BOI
-
SOU
2 stops21h 34m
Delta
Deal found 12/2£947
Sat 2/509:15
SOU
-
BOI
2 stops20h 45m
Delta
Mon 1/607:05
BOI
-
SOU
2 stops26h 45m
Delta
Deal found 12/2£947

Find flight deals from Portsmouth to Boise

Keep the following information in mind while searching for Portsmouth to Boise flight deals. Data was last updated 14 February 2026.

Round-trip from

£850

Popular in

December

Cheapest in

January

Average price

£590
Delta
  • Delta
  • 3/5-20/5
  • 4 total stops
  • 76h 40m total
  • Portsmouth to Boise
Search Deals
Highest demand for flights based on searches. 8% potential increase in price (£50 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 6% potential price decrease (£30 potential savings vs. average return price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Boise 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, Cheapflights users made 858,174 searches. Data last updated 14 February 2026.
Use the filters below to find and compare flights from Portsmouth to Boise that are best for you.

Fly from

Portsmouth

Fly to

Boise

Route

Depart

Return

Price

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Mon 4/5

17:20-21:01

2 stops34h 41m

Boise Air Term. Gowen Fld

Wed 20/5

08:59-08:35

2 stops40h 36m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Tue 5/5

09:05-21:01

2 stops18h 56m

Boise Air Term. Gowen Fld

Mon 18/5

10:36-16:50

2 stops23h 14m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Wed 6/5

09:05-21:01

2 stops18h 56m

Boise Air Term. Gowen Fld

Wed 20/5

08:59-08:35

2 stops40h 36m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Tue 5/5

17:20-16:14

2 stops29h 54m

Boise Air Term. Gowen Fld

Wed 20/5

08:59-08:35

2 stops40h 36m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Sun 3/5

17:20-21:01

2 stops34h 41m

Boise Air Term. Gowen Fld

Sun 17/5

18:08-16:50

2 stops39h 42m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Sun 3/5

17:20-16:14

2 stops29h 54m

Boise Air Term. Gowen Fld

Tue 19/5

20:55-08:35

2 stops52h 40m

£850

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Thu 7/5

09:05-20:15

2 stops18h 10m

Boise Air Term. Gowen Fld

Wed 20/5

08:59-08:35

2 stops40h 36m

£880

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Wed 6/5

09:05-21:01

2 stops18h 56m

Boise Air Term. Gowen Fld

Thu 21/5

20:55-08:45

2 stops52h 50m

£886

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Wed 6/5

09:05-21:01

2 stops18h 56m

Boise Air Term. Gowen Fld

Sat 16/5

18:08-08:35

2 stops55h 27m

£886

SouthamptonBoise

SOU - BOI

SOUBOI

Southampton Eastleigh

Tue 5/5

09:05-21:24

2 stops19h 19m

Boise Air Term. Gowen Fld

Fri 15/5

12:16-16:50

2 stops21h 34m

£897

Flights are sorted by cheapest return flights first.

Deals found on 12/2

Showing 1-10 of 12 results
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Best time to book a flight from Portsmouth to Boise

Have a flexible travel schedule? Discover the best time to fly to Boise from Portsmouth with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portsmouth to Boise

What is the cheapest month to book a flight from Portsmouth to Boise?

Currently, March is the cheapest month in which you can book a flight from Portsmouth to Boise (average of £501). Flying from Portsmouth to Boise in February is currently the most expensive (average of £701). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Boise. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Boise from Portsmouth?

    Boise Air Term. Gowen Fld (BOI) is the airport you will fly into if you book a flight from Portsmouth to Boise. You should not have trouble finding flights to Air Term. Gowen Fld from Portsmouth; the airport handles an average of 0 inbound flights from Portsmouth per day. You should also have plenty of airline options to choose from since 3 airlines have flights to the Boise airport from Portsmouth. It is only a 3.3 mi journey from Air Term. Gowen Fld (BOI) to Boise’s city center.

  • How long is the flight from Portsmouth to Boise?

    There are many flights that can get you from Portsmouth to Boise in 34h 41m. Fly via Delta to get the fastest option. The distance from Portsmouth to Boise is about 4828 mi.

  • Can I find deals for flights from Portsmouth to Boise that include hotel bookings?

    Yes. In addition to deals on Portsmouth to Boise flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portsmouth to Boise?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Boise.

  • Can I find deals for business class flights from Portsmouth to Boise?

    Yes. Cheapflights offers flight deals from Portsmouth to Boise by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portsmouth to Boise?

    Currently, March is the cheapest month in which you can book a flight from Portsmouth to Boise (average of £501). Flying from Portsmouth to Boise in February is currently the most expensive (average of £701). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 3 airlines flying from Portsmouth to Boise

Discover the top 3 airlines that operate flights from Portsmouth to Boise. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 14 February 2026.
AirlineCheapestAverageFlexibilityOn-time
LufthansaCheapest£527Average£657FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£530Average£655FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Virgin AtlanticCheapest£591Average£774FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Boise?

Cheapflights makes it easy to find Portsmouth to Boise flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Boise?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Portsmouth to Boise for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Portsmouth to Boise with no change fees?

Yes, we can. To see specific flights from Portsmouth to Boise with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Portsmouth to Boise become cheaper?

Of course! You can now track prices for flights from Portsmouth to Boise and get an alert from Cheapflights when they change. Have a valid email address ready and click the bell icon next to the flight deals above to set up your price alerts.

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