£20 Find Cheap Flights from Belfast to Portsmouth – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Belfast to Portsmouth departing on 28/9. 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

Save 26% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest return fare
£44
Typical prices: £79-£152
easyJet
Sun 13/9Sat 19/9
BFS - SOU • Direct
Cheapest one-way flight
£20
Typical prices: £47-£52
easyJet
Mon 28/9
BFS - SOU • Direct
Arrival airport
You can’t fly directly to Portsmouth. It is served by Southampton (SOU), located 14.7 miles from Portsmouth.
FAQs
FAQs
FAQs
FAQs
Start a new search
KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Portsmouth!
Flight Deals
Useful Info
Flight Deals

Cheap Flights from Belfast to Portsmouth (BFS-SOU)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Belfast 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 return flight deals from Belfast to Portsmouth

Sun, 13 Sep - Sat, 19 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:15 - 13:30
SOU
-
BFS
1h 15mdirect
£44easyJet
Sun, 13 Sep - Sat, 19 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:15 - 13:30
SOU
-
BFS
1h 15mdirect
£44easyJet
Mon, 14 Sep - Sun, 27 Sep
easyJet Logo
10:35 - 11:50
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:35 - 13:50
SOU
-
BFS
1h 15mdirect
£45easyJet
Sun, 13 Sep - Sat, 19 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:15 - 13:30
SOU
-
BFS
1h 15mdirect
£46easyJet
Sun, 13 Sep - Sat, 19 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:15 - 13:30
SOU
-
BFS
1h 15mdirect
£47easyJet
Sun, 6 Sep - Sun, 13 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:35 - 13:50
SOU
-
BFS
1h 15mdirect
£50easyJet
Sun, 6 Sep - Sun, 13 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:35 - 13:50
SOU
-
BFS
1h 15mdirect
£53easyJet
Sat, 12 Sep - Sun, 13 Sep
easyJet Logo
10:30 - 11:45
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:35 - 13:50
SOU
-
BFS
1h 15mdirect
£57easyJet
Sun, 27 Sep - Mon, 28 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
12:25 - 13:40
SOU
-
BFS
1h 15mdirect
£66easyJet
Sun, 13 Sep - Sat, 19 Sep
easyJet Logo
10:50 - 12:05
BFS
-
SOU
1h 15mdirect
easyJet Logo
07:50 - 09:20
SOU
-
BFS
25h 30m
1 stop
£69easyJet
Useful Info

Good to know - Cheap tickets from Belfast to Portsmouth

Low season

March

Cheapest flight

£20
Best time to beat the crowds (28% less expensive on average)
Most popular time to fly (28% more expensive on average)
Flight from Belfast Intl Airport to Southampton

When to book flights from Belfast to Portsmouth

Are your dates flexible? Find out the best times to travel from Belfast to Portsmouth based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

FAQs for booking flights from Belfast Intl Airport to Portsmouth

  • Which airports will I be using when flying from Belfast Intl Airport to Portsmouth?

    When flying out of Belfast Intl Airport you’ll be using Belfast Intl. Portsmouth does not have its own airport so you’ll be flying into nearby Southampton Eastleigh airport, which is 14.7 mi away.

  • How long does a flight from Belfast Intl Airport to Portsmouth take?

    Direct flights cover the 326 miles separating Belfast Intl Airport and Portsmouth in about 1h 15m.

  • What’s the cheapest day of the week to fly between Belfast Intl Airport and Portsmouth?

    Consider leaving on a Wednesday and avoid Tuesdays if you're looking for the best rates. For your return to Belfast Intl Airport, you’ll find the best rates on Wednesdays and the most expensive ones on Tuesdays.

  • How does KAYAK find such low prices on flights from Belfast 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 Belfast to Portsmouth.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Belfast to Portsmouth?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Portsmouth from Belfast is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Belfast to Portsmouth?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Portsmouth with an airline and back to Belfast with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Belfast 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 Belfast 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 Belfast Intl Airport to Portsmouth?

    In the last 5 days, the cheapest one-way ticket between Belfast Intl Airport and Portsmouth found on KAYAK was with easyJet for £26. easyJet offered a return connection for £40 and Aer Lingus for £85.

Top tips for finding cheap flights from Belfast Intl Airport to Portsmouth

  • There is no airport in Portsmouth. Instead, you’ll be flying into Southampton Airport when flying between Belfast Intl Airport and Portsmouth.
  • The cheapest flight from Belfast Intl Airport to Portsmouth was found 47 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be December, January and February. The cheapest month to fly is March.

Reviews of the top airlines flying from Belfast to Portsmouth

 
Need help choosing which airline to fly with from Belfast 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.
7.3
Aer LingusOverall score based on 1681 reviews
7.4Boarding
7.2Comfort
7.0Entertainment
8.1Crew
6.7Food
Airline reviews

Air Lingus was in no hurry to get us on the plane as sat at the gate a long time before they boarded us. Then they leave us on the tarmac for an hour. They were no help to let me know what I needed to do to get home. I had to navigate London Heathrow with 0 help from them.

2.0 MediocreGeorge Craig, Jul 2026
DUB - LHR
Read more Aer Lingus reviews

Air Lingus was in no hurry to get us on the plane as sat at the gate a long time before they boarded us. Then they leave us on the tarmac for an hour. They were no help to let me know what I needed to do to get home. I had to navigate London Heathrow with 0 help from them.

There was a 6h delay with limited updates . When we got to Manchester the bus took ages to get to arrivals and we missed our train, dinner reservation. Basically lost a whole day due to arrivals Lingus!!

Great. Has a problem with DOB. Fixed 4 us. Led to a 5 hour earlier flight to London!

My flights with Aer Lingus were very good and I will definitely fly with them. Again in future trips to Ireland and Scotland.

At check-in the unmanned machines said QR code was invalid so had to queue for over an hour to check in bags

Friendly crew who apologised and explained reason for delay. Good on board service. Rather cramped seating. Late departure.

Amenity kits were never handed out. There was zero friendliness and assistance by crew. Food was uneatable. One drink was offered and no wine, with dinner or before or after. Cocktails and beverages were not encouraged and when I asked for water, none was given. Poorest, most cramped business class flight I’ve ever been on.

I fly to the USA every 6wks on Ave and 99% of the time I fly Aer Lingus. If I fly BA I’m always disappointed. My only criticism is the food. I’m vegan and over the last year it’s got slightly better these last couple of flights but on the whole it’s not good! Salad and fruit salad for breakfast and that’s also the starter and desert for the lunch/dinner and the main is usually rice with fried veg 😳the pasta is pretty good though. That’s been the last 2 meals…. Everything else is fantastic.

The flight was half full and I presume that the next few days are even less busy not sure why they are still charging a premium to change a flight.

Short flight so not much to rate. Surprised I had to pay for a soda.

The workers checking passengers from the boarding gate stole money from people whose luggage was perfectly fitting inside the carry-on sizer.

Whole way through - far more professional and slick than I expected

Good news was that Bag Check was open two and a half hours before the flight, which is essential with the chaotic immigration process. Flight was okay, but sitting at the back of the aircraft, 3 overhead bins on both sides were filled with crew bags and other misc items, so we couldn't put our cabin bags anywhere near us. To add insult, twice the crew managed to drop items that they were taking out of the overhead bins onto my wife's head, who was sitting in an aisle seat.

You need to make signage at Berlin Airport clearer. Having checked in online we had our boarding passes onlour phones. You do not make it clear that you need to check in again to receive a printed luggage tag. You get to baggage drop off and it says you can only do it with a luggage tag BUT not how to get this.

It was good except they could offer free water and tea/coffe

Sat at rear of aircraft and was very cold. As a frequent flyer for many years, this is was the coldest I have ever been. Other passengers and some crew were complaining how cold it was. Sitting near the doors always risks being colder, just the way the aircraft works - but this was exceptional, bring a good jumper. Everything else was pretty standard easyJet - good value low cost carrier.

The plane was postponed for over 2.5 hours, which meant that all four of us missed the check in time for our ongoing trip to Melbourne. We had to buy new tickets for 4 people as we had to forfeit the ones we had. The cost was really unfair. i understand that it was snowing during the first leg of the plane for that morning. Surely the cost could have been shared by the airline and not all by us. I could have bought insurance - but you can see how much I travel. I will need to chose more trustworthy airlines.

The true is that travel from London to Faro on 11/12/2025 by BA was cancelled, so I did not go to Faro, so i did not board easy flight. The mediocre qualification to you was because even when i bought an insurance, i could not change date neither obtain reimbursement. It could be ideal if you do something in order for me not to lose the purchase Thank you

Queuing for quite a while despite using the "speedy boarding".

Not great! Rude staff in London and the worse baggage reclaim I’ve ever seen. Great staff in flight but doubt I’ll fly with them again

Everything you need to know for your flight from Belfast to Portsmouth

Complete your trip to Portsmouth with a hotel stay or car hire