Find flights
Deals
When to book
Airlines
FAQs

Cheap flights from Belfast Intl Airport to Portsmouth from £20

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 20/9. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
17 Jul — 24 Jul1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Belfast Intl to Portsmouth are usually found in March or May, booked 47 days in advance, depart on a Tuesday or Friday and return on a Tuesday

Cheap flight deals from Belfast Intl to Portsmouth

Enter your travel dates to find the best prices.

Cheapest flights from Belfast Intl to Portsmouth
Explore the most affordable flight options available from Belfast Intl to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 17 June 2026.

Sat 20/610:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 22/612:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 16/6£80
Sun 21/610:50
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 22/612:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 16/6£92
Sat 25/710:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sat 1/812:15
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 14/6£95
Sat 25/710:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sat 8/812:15
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 14/6£101
Fri 4/921:05
BFS
-
SOU
1 stop10h 15m
easyJet
Sat 19/907:50
SOU
-
BFS
1 stop24h 15m
easyJet
Deal found 12/6£102
Sat 12/910:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sat 26/912:15
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 14/6£104
Mon 27/710:35
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 3/812:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 12/6£105
Sat 20/610:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Sun 21/612:35
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 16/6£106
Sat 27/610:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Mon 29/612:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Deal found 16/6£109

Find flight deals from Belfast Intl to Portsmouth

Keep the following information in mind while searching for Belfast Intl to Portsmouth flight deals. Data was last updated 17 June 2026.

Round-trip from

£80

One-way from

£20

Popular in

July

Cheapest in

March

Average price

£126
easyJet
  • easyJet
  • 4/9-19/9
  • 1 total stop
  • 11h 30m total
  • Belfast to Portsmouth
Search Deals
easyJet
  • easyJet
  • 20/9
  • Nonstop
  • 1h 15m total
  • Belfast to Portsmouth
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (£10 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£2 potential savings vs. average return price).
Search Deals
Average for round-trip flights in June 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Belfast Intl to Portsmouth 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 17 June 2026.
Use the filters below to find and compare flights from Belfast Intl Airport to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Fri 4/9

21:05-07:20

1 stop10h 15m

Southampton Eastleigh

Sat 19/9

12:15-13:30

Nonstop1h 15m

£80
Fastest return journey

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 25/7

10:30-11:45

Nonstop1h 15m

Southampton Eastleigh

Sat 8/8

12:15-13:30

Nonstop1h 15m

£101

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sat 12/9

10:30-11:45

Nonstop1h 15m

Southampton Eastleigh

Sat 26/9

12:15-13:30

Nonstop1h 15m

£104

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 27/7

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Fri 31/7

12:20-13:35

Nonstop1h 15m

£118

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Sun 26/7

10:50-12:05

Nonstop1h 15m

Southampton Eastleigh

Mon 27/7

12:25-13:40

Nonstop1h 15m

£130

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 27/7

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Mon 3/8

08:50-12:50

1 stop4h 00m

£135

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 27/7

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Wed 29/7

17:20-19:15

2 stops25h 55m

£136

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 27/7

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Fri 31/7

20:00-11:55

2 stops15h 55m

£142

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Mon 27/7

10:35-11:50

Nonstop1h 15m

Southampton Eastleigh

Wed 29/7

12:30-12:05

1 stop23h 35m

£146

BelfastSouthampton

BFS - SOU

BFSSOU

Belfast Intl

Wed 8/7

15:40-08:35

2 stops16h 55m

Southampton Eastleigh

Wed 22/7

06:45-15:15

1 stop8h 30m

£174

Flights are sorted by cheapest return flights first.

Deals found on 12/6

Showing 1-10 of 21 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Belfast Intl to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Belfast Intl 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 Belfast Intl Airport to Portsmouth

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

Find hourly flight availability from Belfast Intl to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 17 June 2026.

A simple way to save on the total cost of your ticket is to fly from Belfast Intl Airport to Portsmouth at midday. If you’re flexible enough to do this you can expect to save up to 19% on your trip compared to booking a flight in the evening.

How much does it cost for a return flight from Belfast Intl Airport to Portsmouth?

What is the cheapest day to fly from Belfast Intl Airport to Portsmouth?

Use this chart to determine the cheapest time to fly return from Belfast Intl to Portsmouth. Price data was last updated on 13 June 2026.

Travellers seeking maximum savings on their Belfast Intl Airport to Portsmouth flight should consider departing on Tuesday at midday when fares are most often at their lowest. Monday at midday flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Portsmouth

Get insights into the airlines that provide service to Portsmouth. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Portsmouth. Reviews last updated 17 June 2026.
Check out reviews from past customers who have flown with Aer Lingus and easyJet from Belfast Intl Airport to Portsmouth to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.3
Good
1,604 reviews
Check prices

Entertainment

7.0

Overall

7.3

Boarding

7.4

Comfort

7.2

Food

6.7

Crew

8.1

Reviews

1 / 20
4.0
Okay

Lama,May 2026

DUB - ALC

Seats were super small, there was no food, and they lost my bag.
Aer Lingus
7.3
Good
1,604 reviews
Aer Lingus
7.3
Good
1,604 reviews
Check prices

Entertainment

7.0

Overall

7.3

Boarding

7.4

Comfort

7.2

Food

6.7

Crew

8.1

Reviews

1 / 20
4.0
Okay

Lama,May 2026

DUB - ALC

Seats were super small, there was no food, and they lost my bag.
easyJet
6.9
Okay
1,908 reviews
Aer Lingus
7.3
Good
1,604 reviews
Check prices

Entertainment

7.0

Overall

7.3

Boarding

7.4

Comfort

7.2

Food

6.7

Crew

8.1

Reviews

1 / 20
4.0
Okay

Lama,May 2026

DUB - ALC

Seats were super small, there was no food, and they lost my bag.

Related info for your journey

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

  • How long is the flight from Belfast Intl Airport to Portsmouth?

    For as low as £80, easyJet can have you in Portsmouth from Belfast Intl Airport in 10h 15m. There are 326 mi between Belfast Intl Airport and Portsmouth.

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

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

  • How can I find direct flights from Belfast Intl to Portsmouth?

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

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

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

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 4 airlines flying from Belfast Intl to Portsmouth

Discover the top 4 airlines that operate flights from Belfast Intl to Portsmouth. 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 17 June 2026.
AirlineCheapestAverageFlexibilityOn-time
easyJetCheapest£18Average£86FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£19Average£60FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£81Average£128FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£87Average£168FlexibilityNo cancel feeOn-time70%
Search British Airways 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 Belfast Intl to Portsmouth?

Cheapflights helps you search for flights from Belfast Intl to Portsmouth via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

Cheapflights simply makes it quick and affordable to book flights from Belfast Intl to Portsmouth by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

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

Certainly. Search results for flights to Portsmouth from Belfast Intl shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

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

Yes, Cheapflights has a feature called Price Alert, which notifies users when flight prices change. Track prices for your flight to Portsmouth from Belfast Intl today and book when prices fit your budget.

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.