What are the cheapest airlines to fly from Portsmouth to Belfast one-way?

For one-way options, check prices for easyJet. According to our data, you can fly for as low as £33. Users have also found prices from £58 and £162 on Aer Lingus and British Airways, respectively.

In terms of precipitation, rainfall in Belfast ranges from 50.0 - 90.0 inches per month. October is typically the wettest month, when rainfall can reach 90.0 mm. April is typically the driest time to visit Belfast when rainfall is around 50.0 mm.

If weather is an important factor for your trip to Belfast, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 16.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 5.0 C).

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

To save up to 171% on this flight, we recommend booking at least 44 days prior to travel. The price may fluctuate and will likely increase closer to your departure date. Users on Cheapflights have found tickets from Portsmouth to Belfast from £63 1-2 weeks out and tickets from £108 for flights departing within the next 72 hours.

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

January is one of the best times of the year to fly to Belfast from Portsmouth. Prices for January average £62 per person but you can even find prices for as low as £26. The most expensive prices can be found in the month of July. Opting for a January flight can save you 45% on your journey compared to booking in July

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.

£33+ Flights from Portsmouth to Belfast

Cheapflights Tip: The best prices from Portsmouth to Belfast are usually found in September or January, booked 83 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Portsmouth to Belfast

Round-trip from	£87
One-way from	£33
Popular in	December
Cheapest in	September
Average price	£84

Aer Lingus
10/11-17/11
Nonstop
3h 20m total
Portsmouth to Belfast

Search Deals

easyJet
10/7
Nonstop
1h 20m total
Portsmouth to Belfast

Search Deals

Highest demand for flights based on searches. 3% potential increase in price (£2 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 July 2025

Search Deals

Find flight deals from Portsmouth to Belfast

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 1 July 2025.

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Thu 28/811:25SOU - BFS

1 stop10h 50measyJet

Sat 30/806:20BFS - SOU

Nonstop1h 15measyJet

Deal found 30/6£97

Mon 1/920:00SOU - BFS

2 stops22h 45mMultiple Airlines

Sat 6/913:35BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 29/6£133

Mon 10/1112:05SOU - BHD

1 stop5h 10measyJet

Mon 17/1117:45BHD - SOU

1 stop15h 05measyJet

Deal found 28/6£135

Thu 6/1108:55SOU - BHD

Nonstop1h 40mMultiple Airlines

Sat 8/1107:15BHD - SOU

1 stop5h 55mMultiple Airlines

Deal found 28/6£137

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 1/1217:20SOU - BHD

1 stop3h 40mKLM

Sun 7/1206:30BHD - SOU

1 stop10h 20mKLM

Deal found 28/6£266

Best flights from Portsmouth to Belfast
Discover carefully curated flight deals from Portsmouth to Belfast that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 1 July 2025.

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Thu 28/811:25SOU - BFS

1 stop10h 50measyJet

Sat 30/806:20BFS - SOU

Nonstop1h 15measyJet

Deal found 30/6£97

Mon 1/920:00SOU - BFS

2 stops22h 45mMultiple Airlines

Sat 6/913:35BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 29/6£133

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 1/1217:20SOU - BHD

1 stop3h 40mKLM

Sun 7/1206:30BHD - SOU

1 stop10h 20mKLM

Deal found 28/6£266

Mon 10/1112:05SOU - BHD

1 stop5h 10measyJet

Mon 17/1117:45BHD - SOU

1 stop15h 05measyJet

Deal found 28/6£135

Thu 6/1108:55SOU - BHD

Nonstop1h 40mMultiple Airlines

Sat 8/1107:15BHD - SOU

1 stop5h 55mMultiple Airlines

Deal found 28/6£137

Direct flights from Portsmouth to Belfast
Explore direct flight options from Portsmouth to Belfast based on user searches, and compare prices and availability for your desired travel dates. Data last updated 1 July 2025.

Mon 10/1116:45SOU - BHD

Nonstop1h 35mAer Lingus

Mon 17/1106:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 28/6£87

Thu 14/820:40SOU - BFS

Nonstop1h 20measyJet

Thu 21/818:45BFS - SOU

Nonstop1h 15measyJet

Deal found 30/6£125

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Last-minute flights from Portsmouth to Belfast
Discover last-minute flight deals from Portsmouth to Belfast. Data last updated 1 July 2025 and is based on user searches.

Sat 5/708:55SOU - BHD

Nonstop1h 35mAer Lingus

Tue 8/706:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 30/6£152

Sat 5/708:25SOU - BHD

1 stop8h 55mMultiple Airlines

Tue 8/706:40BHD - SOU

Nonstop1h 45mMultiple Airlines

Deal found 30/6£176

Sat 12/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Sat 19/706:40BHD - SOU

Nonstop1h 45mBritish Airways

Deal found 28/6£241

Mon 14/720:30SOU - BFS

2 stops14h 50mMultiple Airlines

Thu 17/718:45BFS - SOU

Nonstop1h 15mMultiple Airlines

Deal found 29/6£171

Fri 25/712:15SOU - BFS

Nonstop1h 20measyJet

Sun 27/710:30BFS - SOU

Nonstop1h 15measyJet

Deal found 30/6£134

Wed 30/716:35SOU - BHD

Nonstop1h 35mAer Lingus

Wed 6/806:40BHD - SOU

Nonstop1h 45mAer Lingus

Deal found 30/6£88

Wed 30/710:50SOU - BHD

1 stop3h 40mMultiple Airlines

Wed 6/806:40BHD - SOU

Nonstop1h 45mMultiple Airlines

Deal found 30/6£173

One-way flights from Portsmouth to Belfast
Search for one-way flight options from Portsmouth to Belfast. Find affordable one-way fares based on user searches. Data last updated 1 July 2025.

Thu 10/720:40SOU - BFS

Nonstop1h 20measyJet

Deal found 30/6£33

Sat 23/819:45SOU - BHD

Nonstop1h 30mAer Lingus

Deal found 30/6£58

Thu 10/720:50SOU - BFS

2 stops24h 25mMultiple Airlines

Deal found 30/6£113

Sat 23/808:25SOU - BHD

1 stop8h 55mMultiple Airlines

Deal found 30/6£118

Sat 23/808:25SOU - BHD

1 stop7h 25measyJet

Deal found 30/6£119

Sat 19/708:55SOU - BHD

Nonstop1h 35mBritish Airways

Deal found 30/6£162

Sun 6/709:20SOU - BHD

1 stop11h 55mKLM

Deal found 29/6£271

Tue 8/712:30SOU - BHD

3 stops24h 25mLoganair

Deal found 30/6£922

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portsmouth to Belfast that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 10/11

16:45-18:20

Nonstop1h 35m

Belfast City

Mon 17/11

06:40-08:25

Nonstop1h 45m

£87

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 28/8

11:25-22:15

1 stop10h 50m

Belfast Intl

Sat 30/8

06:20-07:35

Nonstop1h 15m

£97

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Mon 1/9

20:00-18:45

2 stops22h 45m

Belfast Intl

Sat 6/9

13:35-14:50

Nonstop1h 15m

£133

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 10/11

12:05-17:15

1 stop5h 10m

Belfast City

Mon 17/11

17:45-08:50

1 stop15h 05m

£135

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Thu 6/11

08:55-10:35

Nonstop1h 40m

Belfast City

Sat 8/11

07:15-13:10

1 stop5h 55m

£137

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 12/7

08:55-10:30

Nonstop1h 35m

Belfast City

Sat 19/7

06:40-08:25

Nonstop1h 45m

£241

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Mon 1/12

17:20-21:00

1 stop3h 40m

Belfast City

Sun 7/12

06:30-16:50

1 stop10h 20m

£266

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 10/7

20:40-22:00

Nonstop1h 20m

£33

SouthamptonBelfast

SOU - BHD

SOUBHD

Southampton Eastleigh

Sat 23/8

19:45-21:15

Nonstop1h 30m

£58

SouthamptonBelfast

SOU - BFS

SOUBFS

Southampton Eastleigh

Thu 10/7

20:50-21:15

2 stops24h 25m

£113

Flights are sorted by cheapest return flights first.

Deals found on 30/6

Showing 1-10 of 15 results

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?

To ensure you get the cheapest price possible for a flight from Portsmouth to Belfast, you should look to book at least 83 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, January is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £67). Flying from Portsmouth to Belfast in July is currently the most expensive (average of £90). 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?

When flying from Portsmouth to Belfast, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

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

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

Reviews of airlines servicing Belfast

See what other customers who have flown with KLM, Aer Lingus, andeasyJet 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.

KLM

7.8

Good

1,366 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

KLM

7.8

Good

1,366 reviews

KLM

7.8

Good

1,366 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Aer Lingus

7.1

Good

1,140 reviews

KLM

7.8

Good

1,366 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

easyJet

6.9

Okay

1,819 reviews

KLM

7.8

Good

1,366 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

British Airways

6.6

Okay

7,081 reviews

KLM

7.8

Good

1,366 reviews

Check prices

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

What are the cheapest airlines to fly from Portsmouth to Belfast one-way?
For one-way options, check prices for easyJet. According to our data, you can fly for as low as £33. Users have also found prices from £58 and £162 on Aer Lingus and British Airways, respectively.
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, January is the cheapest month in which you can book a flight from Portsmouth to Belfast (average of £67). Flying from Portsmouth to Belfast in July is currently the most expensive (average of £90). 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

Alternative routes for Portsmouth to Belfast

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Top 6 airlines flying from Portsmouth to Belfast

Airline	Cheapest	Average	Flexibility	On-time
Ryanair	Cheapest£28	Average£54	FlexibilityNo cancel fee	On-timeN/A	Search Ryanair flights
easyJet	Cheapest£29	Average£77	FlexibilityNo cancel fee	On-time86%	Search easyJet flights
Ryanair	Cheapest£31	Average£59	FlexibilityNo cancel fee	On-timeN/A	Search Ryanair flights
Aer Lingus	Cheapest£53	Average£99	FlexibilityNo cancel fee	On-timeN/A	Search Aer Lingus flights
British Airways	Cheapest£76	Average£170	FlexibilityNo cancel fee	On-time70%	Search British Airways flights
Loganair	Cheapest£126	Average£175	FlexibilityNo cancel fee	On-time79%	Search Loganair flights

Fly with Cheapflights

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

Cheapflights helps you search for flights from Portsmouth to Belfast 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 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.

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

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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Cheap flights from Portsmouth to Belfast from £33

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 10/7. Fares are subject to change and may not be available on all flights or dates of travel.

Cheapflights Tip: The best prices from Portsmouth to Belfast are usually found in September or January, booked 83 days in advance, depart on a Tuesday or Thursday and return on a Thursday

Cheap flight deals from Portsmouth to Belfast

Keep the following information in mind while searching for Portsmouth to Belfast flight deals. Data was last updated 1 July 2025.

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Find flight deals from Portsmouth to Belfast

Cheapest flights from Portsmouth to BelfastExplore 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 1 July 2025.

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 1 July 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Portsmouth to Belfast that are best for you.

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.

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 27 June 2025.

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

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 1 July 2025.

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 16 December 2024.

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 1 July 2025.

See what other customers who have flown with KLM, Aer Lingus, andeasyJet 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.

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.

What are the cheapest airlines to fly from Portsmouth to Belfast one-way?

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

How can I find direct flights from Portsmouth to Belfast?

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

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

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.

Alternative routes for Portsmouth to Belfast

See prices for flight routes from nearby airports that may be better suited for you.

Top 6 airlines flying from Portsmouth to Belfast

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 Belfast?

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

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

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

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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 1 July 2025.