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Cheap flights from Portsmouth to Boise from £1,151

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 27/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BOI
15 Nov — 22 Nov1
1 adult
1 adult, Economy

Cheap flight deals from Portsmouth to Boise

Keep the following information in mind while searching for Portsmouth to Boise flight deals. Data was last updated 16 October 2025.

Round-trip from

£1,151

Popular in

July

Cheapest in

September

Average price

£728
Delta
  • Delta
  • 27/3-31/3
  • 4 total stops
  • 56h 19m total
  • Portsmouth to Boise
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£87 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Portsmouth to Boise

Enter your travel dates to find the best prices.

Best flights from Portsmouth to Boise
Discover carefully curated flight deals from Portsmouth to Boise that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 16 October 2025.

Fri 27/308:40SOU - BOI
2 stops35h 29mDelta
Tue 31/313:10BOI - SOU
2 stops20h 50mDelta
Deal found 14/10£1,151

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 16 October 2025.
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

Fri 27/3

08:40-14:09

2 stops35h 29m

Boise Air Term. Gowen Fld

Tue 31/3

13:10-17:00

2 stops20h 50m

£1,151

Flights are sorted by cheapest return flights first.

Deals found on 14/10

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, May is the cheapest month in which you can book a flight from Portsmouth to Boise (average of £540). Flying from Portsmouth to Boise in July is currently the most expensive (average of £677). 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.

What is the cheapest time of day to fly from P0R to BOI?

Find hourly flight availability from Portsmouth to Boise. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 16 October 2025.

When flying from Portsmouth to Boise, the time of day you fly usually plays a role in the price. Save by searching for a flight at midday, which can drop the price by up to 14% versus a flight in the morning.

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 5 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 35h 29m. 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, May is the cheapest month in which you can book a flight from Portsmouth to Boise (average of £540). Flying from Portsmouth to Boise in July is currently the most expensive (average of £677). 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

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Top 5 airlines flying from Portsmouth to Boise

Discover the top 5 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 16 October 2025.
AirlineCheapestAverageFlexibilityOn-time
FinnairCheapest£519Average£641FlexibilityNo cancel feeOn-time76%
Search Finnair flights
United AirlinesCheapest£543Average£677FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
LufthansaCheapest£545Average£634FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
KLMCheapest£574Average£699FlexibilityNo cancel feeOn-time75%
Search KLM flights
Virgin AtlanticCheapest£602Average£772FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights

Fly with Cheapflights

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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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