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 27/4. Fares are subject to change and may not be available on all flights or dates of travel.
BFS — LHR
3 Jan — 10 Jan1
Return
1 adult
Economy
Return
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Belfast Intl to Portsmouth are usually found in March or April, booked 33 days in advance, depart on a Saturday or Wednesday 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 4 December 2025.
Fri 19/1210:35BFS - SOU
1 stop6h 35measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 2/12£121
Tue 23/1212:30BFS - SOU
1 stop20h 20measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 3/12£159
Sat 13/1206:55BFS - SOU
1 stop6h 15measyJet
Tue 16/1209:20SOU - BFS
1 stop7h 40measyJet
Deal found 2/12£164
Fri 19/1205:45BFS - SOU
1 stop8h 00mMultiple Airlines
Thu 1/120:10SOU - BFS
2 stops14h 20mMultiple Airlines
Deal found 2/12£169
Tue 30/1208:35BFS - SOU
1 stop24h 15measyJet
Fri 2/117:45SOU - BFS
1 stop13h 40measyJet
Deal found 2/12£174
Wed 17/1220:40BFS - SOU
1 stop20h 40measyJet
Fri 19/1217:45SOU - BFS
1 stop13h 40measyJet
Deal found 2/12£214
Tue 23/1206:30BFS - SOU
2 stops13h 10mMultiple Airlines
Thu 1/120:10SOU - BFS
2 stops14h 20mMultiple Airlines
Deal found 3/12£215
Tue 30/1207:55BFS - SOU
2 stops24h 55mMultiple Airlines
Fri 2/117:45SOU - BFS
1 stop13h 40mMultiple Airlines
Deal found 2/12£220
Best flights from Belfast Intl to Portsmouth
Discover carefully curated flight deals from Belfast Intl to Portsmouth that have cost, travel time, and stopovers in mind to ensure you get the best travel experience. Data last updated 4 December 2025.
Sat 2/510:30BFS - SOU
Nonstop1h 15measyJet
Sat 9/512:15SOU - BFS
Nonstop1h 15measyJet
Deal found 3/12£41
Thu 15/118:35BFS - SOU
2 stops19h 10mMultiple Airlines
Sun 18/118:20SOU - BFS
1 stop13h 25mMultiple Airlines
Deal found 2/12£126
Fri 19/1210:35BFS - SOU
1 stop6h 35measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 2/12£121
Fri 19/1205:45BFS - SOU
1 stop8h 00mMultiple Airlines
Thu 1/120:10SOU - BFS
2 stops14h 20mMultiple Airlines
Deal found 2/12£169
Tue 23/1212:30BFS - SOU
1 stop20h 20measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 3/12£159
Sat 13/1206:55BFS - SOU
1 stop6h 15measyJet
Tue 16/1209:20SOU - BFS
1 stop7h 40measyJet
Deal found 2/12£164
Direct flights from Belfast Intl to Portsmouth
Explore direct flight options from Belfast Intl to Portsmouth based on user searches, and compare prices and availability for your desired travel dates. Data last updated 4 December 2025.
Sat 2/510:30BFS - SOU
Nonstop1h 15measyJet
Sat 9/512:15SOU - BFS
Nonstop1h 15measyJet
Deal found 3/12£41
Last-minute flights from Belfast Intl to Portsmouth
Discover last-minute flight deals from Belfast Intl to Portsmouth. Data last updated 4 December 2025 and is based on user searches.
Sat 13/1206:55BFS - SOU
1 stop6h 15measyJet
Tue 16/1209:20SOU - BFS
1 stop7h 40measyJet
Deal found 2/12£164
Fri 19/1210:35BFS - SOU
1 stop6h 35measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 2/12£121
Fri 19/1205:45BFS - SOU
1 stop8h 00mMultiple Airlines
Thu 1/120:10SOU - BFS
2 stops14h 20mMultiple Airlines
Deal found 2/12£169
Tue 23/1212:30BFS - SOU
1 stop20h 20measyJet
Thu 1/117:55SOU - BFS
1 stop25h 40measyJet
Deal found 3/12£159
Tue 30/1208:35BFS - SOU
1 stop24h 15measyJet
Fri 2/117:45SOU - BFS
1 stop13h 40measyJet
Deal found 2/12£174
Thu 15/113:35BFS - SOU
1 stop3h 45measyJet
Sun 18/118:20SOU - BFS
1 stop13h 25measyJet
Deal found 2/12£112
Thu 15/118:35BFS - SOU
2 stops19h 10mMultiple Airlines
Sun 18/118:20SOU - BFS
1 stop13h 25mMultiple Airlines
Deal found 2/12£126
One-way flights from Belfast Intl to Portsmouth
Search for one-way flight options from Belfast Intl to Portsmouth. Find affordable one-way fares based on user searches. Data last updated 4 December 2025.
Mon 27/410:35BFS - SOU
Nonstop1h 15measyJet
Deal found 3/12£20
Fri 24/410:35BFS - SOU
Nonstop1h 15measyJet
Deal found 3/12£38
Mon 27/407:00BFS - SOU
2 stops11h 50mMultiple Airlines
Deal found 3/12£136
Fri 24/412:35BFS - SOU
2 stops23h 10mMultiple Airlines
Deal found 2/12£143
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 4 December 2025.
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 4 December 2025.
Use the filters below to find and compare flights from Belfast Intl Airport to Portsmouth that are best for you.
Fly from
Belfast Intl
Fly to
Portsmouth
Route
Depart
Return
Price
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Sat 2/5
10:30-11:45
Nonstop1h 15m
Southampton Eastleigh
Sat 9/5
12:15-13:30
Nonstop1h 15m
£41
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Fri 19/12
10:35-17:10
1 stop6h 35m
Southampton Eastleigh
Thu 1/1
17:55-19:35
1 stop25h 40m
£121
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Thu 15/1
18:35-13:45
2 stops19h 10m
Southampton Eastleigh
Sun 18/1
18:20-07:45
1 stop13h 25m
£126
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Tue 23/12
12:30-08:50
1 stop20h 20m
Southampton Eastleigh
Thu 1/1
17:55-19:35
1 stop25h 40m
£159
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Sat 13/12
06:55-13:10
1 stop6h 15m
Southampton Eastleigh
Tue 16/12
09:20-17:00
1 stop7h 40m
£164
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Fri 19/12
05:45-13:45
1 stop8h 00m
Southampton Eastleigh
Thu 1/1
20:10-10:30
2 stops14h 20m
£169
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Mon 27/4
10:35-11:50
Nonstop1h 15m
£20
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Fri 24/4
10:35-11:50
Nonstop1h 15m
£38
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Mon 27/4
07:00-18:50
2 stops11h 50m
£136
BelfastSouthampton
BFS - SOU
BFSSOU
Belfast Intl
Fri 24/4
12:35-11:45
2 stops23h 10m
£143
Flights are sorted by cheapest return flights first.
Deals found on 3/12
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
How far ahead should I book a flight from Belfast Intl Airport to Portsmouth?
Use this chart to determine the optimal time to book a return flight from Belfast Intl to Portsmouth. Price data was last updated on 28 November 2025.
The price you pay for your flight from Belfast Intl Airport to Portsmouth may vary depending on when you book. For the best chance of a lower fare, look to book 33 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest month to book a flight from Belfast Intl Airport to Portsmouth?
Currently, March is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £14). Flying from Belfast Intl Airport to Portsmouth in July is currently the most expensive (average of £47). 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 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 4 December 2025.
A simple way to save on the total cost of your ticket is to fly from Belfast Intl Airport to Portsmouth in the evening. If you’re flexible enough to do this you can expect to save up to 7% on your trip compared to booking a flight in the afternoon.
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 16 December 2024.
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. Sunday afternoons 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 4 December 2025.
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.
Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
Fine except for app. Couldn’t check in online - kept saying I couldn’t check in until the morning after my flight. On second leg I could check in but couldn’t get my boarding pass into my wallet. Thankfully I took a screenshot of it because I couldn’t retrieve it when we boarded - the app prohibited it.
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 £41, easyJet can have you in Portsmouth from Belfast Intl Airport in 1h 15m. There are 326 mi between Belfast Intl Airport and Portsmouth. Generally, flights for this route are direct.
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.
What is the cheapest month to book a flight from Belfast Intl Airport to Portsmouth?
Currently, March is the cheapest month in which you can book a flight from Belfast Intl Airport to Portsmouth (average of £14). Flying from Belfast Intl Airport to Portsmouth in July is currently the most expensive (average of £47). 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.
Browse through other flights departing from Belfast Intl. Flights are based on user searches made on Cheapflights and were last updated on 4 December 2025.
Top 5 airlines flying from Belfast Intl to Portsmouth
Discover the top 5 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 4 December 2025.
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.
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