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Cheap flights from London to Siena from £64

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 6/11. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BLQ
8 Jul — 15 Jul1
1 adult

Cheapflights Tip: The best prices from London to Siena are usually found in January or November, booked 66 days in advance, depart on a Tuesday or Wednesday and return on a Monday

Cheap flight deals from London to Siena

Keep the following information in mind while searching for London to Siena flight deals. Data was last updated 3 July 2025.

Round-trip from

£137

One-way from

£64

Popular in

August

Cheapest in

January

Average price

£210
ITA Airways
  • ITA Airways
  • 2/12-4/12
  • 3 total stops
  • 13h 55m total
  • London to Siena
Search Deals
Vueling
  • Vueling
  • 6/11
  • 1 total stop
  • 6h 25m total
  • London to Siena
Search Deals
Highest demand for flights based on searches. 19% potential increase in price (£29 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from London to Siena

Cheapest flights from London to Siena
Explore the most affordable flight options available from London to Siena. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 July 2025.

Tue 2/1213:15LCY - FLR
2 stops8h 25mITA Airways
Thu 4/1211:40FLR - LCY
1 stop5h 30mITA Airways
Deal found 1/7£137
Mon 8/919:50LGW - FLR
Nonstop2h 15mVueling
Mon 15/906:55FLR - LGW
Nonstop2h 25mVueling
Deal found 1/7£139
Wed 13/819:00LHR - FLR
Nonstop2h 20mBritish Airways
Wed 20/807:05FLR - LHR
Nonstop2h 25mBritish Airways
Deal found 1/7£140
Wed 3/911:40LTN - FLR
2 stops19h 45mMultiple Airlines
Wed 10/906:15FLR - LTN
1 stop5h 30mMultiple Airlines
Deal found 2/7£140
Tue 9/1208:45LHR - FLR
1 stop6h 50mLufthansa
Tue 6/108:00FLR - LHR
1 stop8h 50mLufthansa
Deal found 2/7£141
Wed 3/915:30LGW - FLR
2 stops24h 30mMultiple Airlines
Wed 10/906:15FLR - LGW
1 stop10h 50mMultiple Airlines
Deal found 2/7£141
Sun 31/807:25LHR - FLR
1 stop11h 50mMultiple Airlines
Thu 4/911:30FLR - LHR
1 stop11h 05mMultiple Airlines
Deal found 2/7£144
Wed 17/913:55STN - FLR
1 stop8h 00mMultiple Airlines
Sun 28/918:45FLR - STN
2 stops17h 45mMultiple Airlines
Deal found 30/6£145
Thu 2/1018:40LGW - FLR
1 stop26h 55mSWISS
Wed 8/1006:05FLR - LGW
1 stop12h 45mSWISS
Deal found 1/7£147
Sat 18/1006:00LHR - FLR
1 stop10h 45mAustrian Airlines
Tue 21/1011:00FLR - LHR
1 stop8h 40mAustrian Airlines
Deal found 2/7£150
Fri 15/806:40LHR - FLR
1 stop11h 40mScandinavian Airlines
Fri 22/812:20FLR - LHR
1 stop7h 10mScandinavian Airlines
Deal found 1/7£151
Tue 5/811:05LHR - FLR
1 stop22h 40mBrussels Airlines
Thu 21/811:30FLR - LHR
1 stop6h 35mBrussels Airlines
Deal found 1/7£160

Cheapflights Fare Finder

Customise your flight search to find flights from London to Siena 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 3 July 2025.
Use the filters below to find and compare flights from London to Siena that are best for you.

Fly from

London

Fly to

Siena

Route

Depart

Return

Price

LondonFlorence

LCY - FLR

LCYFLR

London City

Tue 2/12

13:15-22:40

2 stops8h 25m

Florence Peretola

Thu 4/12

11:40-16:10

1 stop5h 30m

£137

LondonFlorence

LGW - FLR

LGWFLR

London Gatwick

Mon 8/9

19:50-23:05

Nonstop2h 15m

Florence Peretola

Mon 15/9

06:55-08:20

Nonstop2h 25m

£139

LondonFlorence

LHR - FLR

LHRFLR

London Heathrow

Wed 13/8

19:00-22:20

Nonstop2h 20m

Florence Peretola

Wed 20/8

07:05-08:30

Nonstop2h 25m

£140

LondonFlorence

LTN - FLR

LTNFLR

London Luton

Wed 3/9

11:40-08:25

2 stops19h 45m

Florence Peretola

Wed 10/9

06:15-10:45

1 stop5h 30m

£140

LondonFlorence

LHR - FLR

LHRFLR

London Heathrow

Tue 9/12

08:45-16:35

1 stop6h 50m

Florence Peretola

Tue 6/1

08:00-15:50

1 stop8h 50m

£141

LondonFlorence

LGW - FLR

LGWFLR

London Gatwick

Wed 3/9

15:30-17:00

2 stops24h 30m

Florence Peretola

Wed 10/9

06:15-16:05

1 stop10h 50m

£141

LondonFlorence

LHR - FLR

LHRFLR

London Heathrow

Sun 31/8

07:25-20:15

1 stop11h 50m

Florence Peretola

Thu 4/9

11:30-21:35

1 stop11h 05m

£144

LondonFlorence

STN - FLR

STNFLR

London Stansted

Wed 17/9

13:55-22:55

1 stop8h 00m

Florence Peretola

Sun 28/9

18:45-11:30

2 stops17h 45m

£145

LondonFlorence

LGW - FLR

LGWFLR

London Gatwick

Thu 2/10

18:40-22:35

1 stop26h 55m

Florence Peretola

Tue 7/10

06:05-17:50

1 stop12h 45m

£147

LondonFlorence

LHR - FLR

LHRFLR

London Heathrow

Sat 18/10

09:05-17:45

1 stop7h 40m

Florence Peretola

Wed 22/10

11:00-08:20

1 stop22h 20m

£150

Flights are sorted by cheapest return flights first.

Deals found on 1/7

Showing 1-10 of 39 results
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Best time to book a flight from London to Siena

Have a flexible travel schedule? Discover the best time to fly to Siena from London 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 London to Siena

How far ahead should I book a flight from London to Siena?

Use this chart to determine the optimal time to book a return flight from London to Siena. Price data was last updated on 27 June 2025.

To ensure you get the cheapest price possible for a flight from London to Siena, you should look to book at least 66 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 London to Siena?

Currently, January is the cheapest month in which you can book a flight from London to Siena (average of £118). Flying from London to Siena in May is currently the most expensive (average of £222). 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 LON to S1N?

Find hourly flight availability from London to Siena. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 July 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from London to Siena as you normally would.

What is the cheapest day to fly from London to Siena?

Use this chart to determine the cheapest time to fly return from London to Siena. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their London to Siena flight should consider departing on Saturday at midday when fares are most often at their lowest. Friday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

How much does it cost for a return flight from London to Siena?

Reviews of airlines servicing Siena

Get insights into the airlines that provide service to Siena. 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 Siena. Reviews last updated 3 July 2025.
Check out reviews from past customers who have flown with KLM, Austrian Airlines, andAir France from London to Siena 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.
KLM
7.8
Good
1,366 reviews
Check prices

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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.
Austrian Airlines
7.6
Good
809 reviews
KLM
7.8
Good
1,366 reviews
Check prices

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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.
Air France
7.5
Good
1,473 reviews
KLM
7.8
Good
1,366 reviews
Check prices

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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.
SWISS
7.5
Good
1,654 reviews
KLM
7.8
Good
1,366 reviews
Check prices

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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.
Scandinavian Airlines
7.3
Good
1,415 reviews
KLM
7.8
Good
1,366 reviews
Check prices

Entertainment

7.1

Food

7.2

Crew

8.4

Comfort

7.7

Boarding

7.8

Overall

7.8

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

Find useful and relevant information for your journey from London to Siena. 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 London to Siena one-way?

    The cheapet airlines for a one-way flight from London to Siena are Vueling (£64), British Airways (£75), and ITA Airways (£86).

  • What are the most popular routes from London to Siena?

    The most popular route from London to Siena is London Heathrow - Florence Peretola. You may also consider London City - Florence Peretola or London Gatwick - Florence Peretola.

  • What are the most reliable airlines from London to Siena?

    Consider Japan Airlines (81%), British Airways (78%) or American Airlines (76%) when booking your flight. These represent the most reliable airlines when flying from London to Siena.

  • What are the cheapest flights from London to Siena?

    While on average a flight from London to Siena is generally £190, our data shows the cheapest flight currently is £50. When looking at the most popular route, (London Heathrow - Florence Peretola), you can expect to pay £141 for that flight.

  • Can I find deals for flights from London to Siena that include hotel bookings?

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

  • How can I find direct flights from London to Siena?

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

  • Can I find deals for business class flights from London to Siena?

    Yes. Cheapflights offers flight deals from London to Siena 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 London to Siena?

    Currently, January is the cheapest month in which you can book a flight from London to Siena (average of £118). Flying from London to Siena in May is currently the most expensive (average of £222). 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 London to Siena

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from London to Siena

Discover the top 8 airlines that operate flights from London to Siena. 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 3 July 2025.
AirlineCheapestAverageFlexibilityOn-time
RyanairCheapest£25Average£126FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
easyJetCheapest£45Average£137FlexibilityNo cancel feeOn-time86%
Search easyJet flights
VuelingCheapest£58Average£165FlexibilityNo cancel feeOn-time88%
Search Vueling flights
KLMCheapest£83Average£164FlexibilityNo cancel feeOn-time75%
Search KLM flights
British AirwaysCheapest£88Average£240FlexibilityNo cancel feeOn-time70%
Search British Airways flights
SWISSCheapest£118Average£179FlexibilityNo cancel feeOn-time79%
Search SWISS flights
LufthansaCheapest£122Average£182FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air FranceCheapest£142Average£216FlexibilityNo cancel feeOn-time77%
Search Air France 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 London to Siena?

When you search for this flight from London to Siena, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from London to Siena?

Cheapflights simply makes it quick and affordable to book flights from London to Siena 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 London to Siena with no change fees?

Certainly. Search results for flights to Siena from London 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 London to Siena become cheaper?

Yes, Cheapflights offers price alerts on London to Siena flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

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