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Cheap flights from Portsmouth to Belfast 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 26/4. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — BHD
27 Mar — 3 Apr1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Portsmouth to Belfast are usually found in May or April, booked 76 days in advance, depart on a Tuesday or Saturday and return on a Wednesday

Cheap flight deals from Portsmouth to Belfast

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Belfast
Explore the most affordable flight options available from Portsmouth to Belfast. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 25 February 2026.

Fri 8/512:20
SOU
-
BFS
Nonstop1h 15m
easyJet
Mon 11/510:35
BFS
-
SOU
Nonstop1h 15m
easyJet
Deal found 22/2£87
Sun 10/512:35
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Sun 17/506:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Deal found 24/2£93
Mon 15/612:35
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Thu 18/610:25
BHD
-
SOU
Nonstop1h 40m
Aer Lingus
Deal found 21/2£95
Mon 20/408:55
SOU
-
BHD
Nonstop1h 40m
Aer Lingus
Fri 24/406:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Deal found 22/2£96
Fri 5/619:30
SOU
-
BHD
Nonstop1h 35m
Aer Lingus
Sun 7/617:25
BHD
-
SOU
Nonstop1h 35m
Aer Lingus
Deal found 21/2£97
Sun 10/512:35
SOU
-
BFS
Nonstop1h 15m
easyJet
Sun 17/521:25
BFS
-
SOU
1 stop15h 00m
easyJet
Deal found 24/2£98
Tue 24/208:55
SOU
-
BHD
Nonstop1h 40m
Aer Lingus
Tue 3/306:40
BHD
-
SOU
Nonstop1h 45m
Aer Lingus
Deal found 23/2£98
Mon 20/412:25
SOU
-
BFS
Nonstop1h 15m
easyJet
Fri 24/421:05
BFS
-
SOU
1 stop10h 15m
easyJet
Deal found 22/2£102
Sun 6/912:35
SOU
-
BFS
Nonstop1h 15m
easyJet
Sat 12/910:30
BFS
-
SOU
Nonstop1h 15m
easyJet
Deal found 24/2£102
Thu 9/411:40
SOU
-
BFS
1 stop4h 15m
easyJet
Thu 16/408:20
BFS
-
SOU
1 stop23h 05m
easyJet
Deal found 23/2£104
Fri 5/612:20
SOU
-
BFS
Nonstop1h 15m
easyJet
Sun 7/610:50
BFS
-
SOU
Nonstop1h 15m
easyJet
Deal found 21/2£105
Fri 24/712:20
SOU
-
BFS
Nonstop1h 15m
easyJet
Sun 26/710:50
BFS
-
SOU
Nonstop1h 15m
easyJet
Deal found 23/2£109

Find flight deals from Portsmouth to Belfast

Keep the following information in mind while searching for Portsmouth to Belfast flight deals. Data was last updated 25 February 2026.

Round-trip from

£87

One-way from

£20

Popular in

December

Cheapest in

May

Average price

£139
easyJet
  • easyJet
  • 8/5-11/5
  • Nonstop
  • 2h 30m total
  • Portsmouth to Belfast
Search Deals
easyJet
  • easyJet
  • 26/4
  • Nonstop
  • 1h 15m total
  • Portsmouth to Belfast
Search Deals
Highest demand for flights based on searches. 17% potential increase in price (£17 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£4 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 Belfast 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 25 February 2026.
Use the filters below to find and compare flights from Portsmouth to Belfast that are best for you.

Fly from

Portsmouth

Fly to

Belfast

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 19/6

12:20-13:35

Nonstop1h 15m

Belfast Intl

Sun 21/6

10:50-12:05

Nonstop1h 15m

£87

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 9/4

11:40-15:55

1 stop4h 15m

Belfast Intl

Thu 16/4

08:20-07:25

1 stop23h 05m

£104

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 5/6

12:20-13:35

Nonstop1h 15m

Belfast Intl

Sun 7/6

10:50-12:05

Nonstop1h 15m

£105

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 24/7

12:20-13:35

Nonstop1h 15m

Belfast Intl

Sun 26/7

10:50-12:05

Nonstop1h 15m

£109

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 6/7

12:25-13:40

Nonstop1h 15m

Belfast Intl

Wed 8/7

07:35-12:00

1 stop4h 25m

£110

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 4/6

11:40-17:05

1 stop5h 25m

Belfast Intl

Mon 8/6

10:35-11:50

Nonstop1h 15m

£122

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Fri 10/4

08:00-14:00

1 stop6h 00m

Belfast Intl

Fri 17/4

17:15-08:20

1 stop15h 05m

£124

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sat 23/5

07:50-08:05

1 stop24h 15m

Belfast Intl

Mon 25/5

10:35-11:50

Nonstop1h 15m

£128

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Sun 19/4

12:35-13:50

Nonstop1h 15m

Belfast Intl

Sun 26/4

09:35-08:40

2 stops23h 05m

£136

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Fri 24/7

19:30-21:05

Nonstop1h 35m

Belfast City

Sun 26/7

17:25-19:00

Nonstop1h 35m

£226

Flights are sorted by cheapest return flights first.

Deals found on 24/2

Showing 1-10 of 35 results
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Best time to book a flight from Portsmouth to Belfast

Have a flexible travel schedule? Discover the best time to fly to Belfast 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 Belfast

How far ahead should I book a flight from Portsmouth to Belfast?

Use this chart to determine the optimal time to book a return flight from Portsmouth to Belfast. Price data was last updated on 20 February 2026.

To ensure you get the cheapest price possible for a flight from Portsmouth to Belfast, you should look to book at least 76 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, November is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £15). Flying from Portsmouth to Belfast in August is currently the most expensive (average of £39). 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 BFS?

Find hourly flight availability from Portsmouth to Belfast. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 25 February 2026.

One of the essential ways to save on airfare from Portsmouth to Belfast is to remain as flexible as possible. Flights that are at midday tend to be the most expensive. A flight in the morning could potentially save you up to 37% on airfare.

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

Use this chart to determine the cheapest time to fly return from Portsmouth to Belfast. Price data was last updated on 21 February 2026.

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

Reviews of airlines servicing Belfast

Get insights into the airlines that provide service to Belfast. 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 Belfast. Reviews last updated 25 February 2026.
See what other customers who have flown with Aer Lingus and easyJet from Portsmouth to Belfast have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Aer Lingus
7.2
Good
1,464 reviews
Check prices

Overall

7.2

Crew

8.1

Food

6.6

Boarding

7.4

Entertainment

7.0

Comfort

7.1

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
Aer Lingus
7.2
Good
1,464 reviews
Aer Lingus
7.2
Good
1,464 reviews
Check prices

Overall

7.2

Crew

8.1

Food

6.6

Boarding

7.4

Entertainment

7.0

Comfort

7.1

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.
easyJet
6.9
Okay
1,876 reviews
Aer Lingus
7.2
Good
1,464 reviews
Check prices

Overall

7.2

Crew

8.1

Food

6.6

Boarding

7.4

Entertainment

7.0

Comfort

7.1

Reviews

1 / 20
10.0
Excellent

Griffith,Feb 2026

MAN - DUB

Great experience. Crew was friendly, food was better than what I have experienced with some other airlines and seat pitch was adequate. I would fly Aer Lingus again.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Belfast. 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 Portsmouth to Belfast?

    easyJet, Aer Lingus, and British Airways can get you from Portsmouth to Belfast in just under 1h 15m. Your travel time will be generally consistent. There are 326 mi between Portsmouth and Belfast. All flights are typically direct.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Belfast 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 Belfast?

    Currently, November is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £15). Flying from Portsmouth to Belfast in August is currently the most expensive (average of £39). 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

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Alternative routes for Portsmouth to Belfast

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Portsmouth to Belfast

Discover the top 6 airlines that operate flights from Portsmouth to Belfast. 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 25 February 2026.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£18Average£61FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£25Average£84FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£40Average£73FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
Aer LingusCheapest£66Average£120FlexibilityNo cancel feeOn-timeN/A
Search Aer Lingus flights
British AirwaysCheapest£84Average£164FlexibilityNo cancel feeOn-time70%
Search British Airways flights
LoganairCheapest£135Average£197FlexibilityNo cancel feeOn-time79%
Search Loganair flights

Fly with Cheapflights

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

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

Cheapflights helps you find that perfect flight to Belfast from Portsmouth by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

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

Users can book flights with no change fees policies with our dedicated filters. Book flights from Portsmouth to Belfast flexibly with Cheapflights today.

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Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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