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Cheap flights from Portsmouth to Key Largo from £341

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 25/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
20 Aug — 27 Aug1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Key Largo

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Key Largo
Explore the most affordable flight options available from Portsmouth to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 July 2026.

Mon 31/820:00
SOU
-
MIA
2 stops29h 05m
Aer Lingus
Mon 7/915:00
MIA
-
SOU
2 stops20h 50m
Aer Lingus
Deal found 17/7£642
Wed 26/820:00
SOU
-
MIA
2 stops24h 05m
Aer Lingus
Sun 30/816:55
MIA
-
SOU
2 stops34h 45m
Aer Lingus
Deal found 16/7£657
Mon 31/809:05
SOU
-
MIA
3 stops58h 30m
Multiple Airlines
Sun 6/900:30
MIA
-
SOU
3 stops51h 15m
Multiple Airlines
Deal found 17/7£665
Mon 31/817:20
SOU
-
MIA
1 stop26h 25m
KLM
Mon 7/911:24
MIA
-
SOU
2 stops16h 11m
KLM
Deal found 17/7£677
Wed 28/1017:30
SOU
-
MIA
1 stop26h 45m
Delta
Tue 10/1107:00
MIA
-
SOU
2 stops20h 10m
Delta
Deal found 17/7£697
Thu 29/1008:40
SOU
-
MIA
2 stops16h 32m
Delta
Sun 8/1108:30
MIA
-
SOU
2 stops27h 30m
Delta
Deal found 17/7£700
Mon 12/1017:20
SOU
-
MIA
1 stop26h 25m
Delta
Wed 21/1007:15
MIA
-
SOU
2 stops20h 20m
Delta
Deal found 19/7£703
Tue 27/1017:30
SOU
-
MIA
2 stops33h 17m
Delta
Sat 7/1117:59
MIA
-
SOU
2 stops18h 01m
Delta
Deal found 17/7£705
Thu 15/1009:05
SOU
-
MIA
2 stops16h 56m
Delta
Thu 22/1011:47
MIA
-
SOU
2 stops15h 48m
Delta
Deal found 19/7£707
Sat 24/1009:20
SOU
-
MIA
2 stops20h 33m
Delta
Thu 12/1112:45
MIA
-
SOU
2 stops14h 25m
Delta
Deal found 17/7£711
Sat 10/1009:20
SOU
-
MIA
2 stops29h 54m
Delta
Sun 25/1019:30
MIA
-
SOU
2 stops17h 30m
Delta
Deal found 19/7£718

Find flight deals from Portsmouth to Key Largo

Keep the following information in mind while searching for Portsmouth to Key Largo flight deals. Data was last updated 21 July 2026.

Round-trip from

£642

One-way from

£341

Popular in

December

Cheapest in

September

Average price

£608
Aer Lingus
  • Aer Lingus
  • 31/8-7/9
  • 4 total stops
  • 49h 55m total
  • Portsmouth to Key Largo
Search Deals
Aer Lingus
  • Aer Lingus
  • 25/10
  • 2 total stops
  • 40h 30m total
  • Portsmouth to Key Largo
Search Deals
High demand for flights, 3% potential price rise
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£6 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Key Largo 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 21 July 2026.
Use the filters below to find and compare flights from Portsmouth to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Fri 30/10

17:30-21:12

2 stops31h 42m

Miami

Fri 13/11

16:55-08:55

1 stop11h 00m

£700

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 12/10

17:20-14:45

1 stop26h 25m

Miami

Fri 23/10

11:09-08:45

2 stops16h 36m

£703

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 12/10

17:20-14:45

1 stop26h 25m

Miami

Mon 19/10

11:09-08:35

2 stops16h 26m

£703

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Tue 27/10

17:30-22:47

2 stops33h 17m

Miami

Thu 12/11

12:45-08:10

2 stops14h 25m

£705

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 15/10

09:05-21:01

2 stops16h 56m

Miami

Fri 23/10

07:15-08:45

2 stops20h 30m

£707
Fastest return journey

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 15/10

09:05-21:01

2 stops16h 56m

Miami

Wed 21/10

16:20-16:50

2 stops19h 30m

£707

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Wed 26/8

18:05-14:45

1 stop25h 40m

Miami

Sun 30/8

06:00-08:35

2 stops21h 35m

£752

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Fri 15/1

09:20-17:10

1 stop12h 50m

Miami

Fri 5/2

19:05-08:40

1 stop32h 35m

£756

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 14/1

17:05-17:10

1 stop29h 05m

Miami

Thu 4/2

22:00-19:25

2 stops16h 25m

£766

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 2/8

09:15-10:52

2 stops30h 37m

Miami

Sat 12/12

07:00-08:55

2 stops20h 55m

£773

Flights are sorted by cheapest return flights first.

Deals found on 20/7

Showing 1-10 of 23 resultsSorted by cheapest first
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Best time to book a flight from Portsmouth to Key Largo

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

What is the cheapest time of day to fly from P0R to KE9?

Find hourly flight availability from Portsmouth to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 July 2026.

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

Weekly flight availability from Portsmouth to Key Largo

Explore weekly flight availability from Portsmouth to Key Largo. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 21 July 2026.

The most flights from P0R to KE9 are scheduled on a Monday (26 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (16 on average).

Related info for your journey

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

    There are many flights that can get you from Portsmouth to Key Largo in 31h 42m. Fly via Delta to get the fastest option. The distance from Portsmouth to Key Largo is about 4381 mi.

  • What are the most reliable airlines from Portsmouth to Key Largo?

    The top 3 most reliable airlines when flying from Portsmouth to Key Largo are SAUDIA (100%), Gulf Air (94%) and Malaysia Airlines (88%).

  • What are the cheapest flights from Portsmouth to Key Largo?

    Looking at all options, your cheapest flight can be booked for £348. While the most popular route (Southampton Eastleigh - Miami) can be booked for £707 on average, our data indicates £2,056 when flying from Portsmouth to Key Largo.

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

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

  • How can I find direct flights from Portsmouth to Key Largo?

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Key Largo 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

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Alternative routes for Portsmouth to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Portsmouth to Key Largo

Discover the top 10 airlines that operate flights from Portsmouth to Key Largo. 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 21 July 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£267Average£396FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
IcelandairCheapest£296Average£420FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
DeltaCheapest£308Average£652FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
KLMCheapest£308Average£593FlexibilityNo cancel feeOn-time75%
Search KLM flights
Scandinavian AirlinesCheapest£310Average£371FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
A.P.G.Cheapest£322Average£392FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
SWISSCheapest£342Average£445FlexibilityNo cancel feeOn-time79%
Search SWISS flights
United AirlinesCheapest£355Average£543FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapest£358Average£528FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
FinnairCheapest£358Average£540FlexibilityNo cancel feeOn-time76%
Search Finnair 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 Portsmouth to Key Largo?

Cheapflights helps you search for flights from Portsmouth to Key Largo 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 Key Largo?

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Key Largo from Portsmouth.

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

Certainly. Search results for flights to Key Largo from Portsmouth 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 Portsmouth to Key Largo become cheaper?

Yes! Start tracking prices for Portsmouth to Key Largo flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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