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Cheap flights from London to Siena from £66

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 21/9. Fares are subject to change and may not be available on all flights or dates of travel.
LON — BLQ
5 Sep — 12 Sep1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from London to Siena are usually found in January or November, booked 57 days in advance, depart on a Tuesday or Monday and return on a Thursday

Cheap flight deals from London to Siena

Enter your travel dates to find the best prices.

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 6 August 2026.

Tue 15/919:40 -
Nonstop2h 15m
Sat 19/906:55 -
Nonstop2h 25m
Deal found 4/8£108
Tue 15/907:55 -
2 stops24h 05m
Tue 22/907:00 -
1 stop6h 45m
Deal found 3/8£108
Mon 28/917:50 -
1 stop13h 35m
Wed 30/918:45 -
2 stops19h 15m
Deal found 4/8£109
Sun 20/913:20 -
2 stops17h 00m
Tue 22/918:50 -
2 stops22h 50m
Deal found 4/8£109
Sat 26/919:50 -
Nonstop2h 15m
Mon 28/906:55 -
Nonstop2h 25m
Deal found 4/8£110
Sat 19/919:50 -
Nonstop2h 15m
Sat 26/906:55 -
Nonstop2h 25m
Deal found 3/8£111
Sat 12/919:50 -
Nonstop2h 15m
Mon 21/910:20 -
1 stop13h 25m
Deal found 4/8£111
Thu 15/1017:35 -
1 stop13h 50m
Thu 22/1022:05 -
1 stop10h 05m
Deal found 4/8£111
Fri 18/920:55 -
1 stop10h 35m
Fri 25/906:55 -
Nonstop2h 25m
Deal found 4/8£113
Mon 28/918:05 -
1 stop13h 20m
Wed 30/918:45 -
2 stops18h 40m
Deal found 1/8£114
Tue 1/919:40 -
Nonstop2h 15m
Thu 17/909:15 -
2 stops24h 20m
Deal found 4/8£114
Sat 10/1018:15 -
1 stop13h 00m
Tue 13/1018:50 -
2 stops26h 05m
Deal found 6/8£114

Find flight deals from London to Siena

Keep the following information in mind while searching for London to Siena flight deals. Data was last updated 6 August 2026.

Round-trip from

£108

One-way from

£66

Popular in

May

Cheapest in

January

Average price

£214
Vueling
  • Vueling
  • 15/9-19/9
  • Nonstop
  • 4h 40m total
  • London to Siena
Search Deals
21/9
  • 21/9
  • 2 total stops
  • 24h 30m total
  • London to Siena
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (£18 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£4 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2026
Search Deals

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 6 August 2026.
Use the filters below to find and compare flights from London to Siena that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Sat 26/9

17:15-08:40

1 stop14h 25m

Florence Peretola

Mon 28/9

06:30-08:30

2 stops27h 00m

£120

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Sat 12/9

18:15-08:05

1 stop12h 50m

Florence Peretola

Thu 17/9

09:15-00:30

2 stops16h 15m

£134

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Fri 18/9

17:50-08:30

1 stop13h 40m

Florence Peretola

Fri 25/9

12:00-23:05

2 stops12h 05m

£139

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Mon 28/9

18:05-08:25

1 stop13h 20m

Florence Peretola

Wed 30/9

21:55-11:00

1 stop14h 05m

£141

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Tue 29/9

07:00-17:05

1 stop9h 05m

Florence Peretola

Fri 2/10

21:55-22:40

2 stops25h 45m

£145

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Sat 3/10

14:10-21:20

1 stop6h 10m

Florence Peretola

Sun 4/10

09:15-23:15

1 stop15h 00m

£145

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Wed 4/11

12:15-20:25

1 stop7h 10m

Florence Peretola

Sun 8/11

08:00-17:35

1 stop10h 35m

£146

LondonFlorence

LTN London Luton - FLR Florence Peretola

LTNFLR

London Luton

Tue 6/10

14:45-21:25

1 stop5h 40m

Florence Peretola

Sun 11/10

06:45-14:45

1 stop9h 00m

£148

LondonFlorence

LGW London Gatwick - FLR Florence Peretola

LGWFLR

London Gatwick

Tue 1/9

16:50-08:35

1 stop14h 45m

Florence Peretola

Thu 17/9

22:05-10:15

1 stop13h 10m

£157

LondonFlorence

LGW London Gatwick - FLR Florence Peretola

LGWFLR

London Gatwick

Sat 26/9

13:00-22:55

1 stop8h 55m

Florence Peretola

Mon 28/9

22:00-09:30

1 stop12h 30m

£160

Flights are sorted by cheapest return flights first.

Deals found on 3/8

Showing 1-10 of 60 resultsSorted by cheapest first
1
2
3
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6

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

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 6 August 2026.

It’s optimal to fly from London to Siena in the morning. By choosing this option you can save up to 1% on the cost of your flight, compared to a flight in the evening.

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

Airfare is below average for this route at the moment.
London to Siena flights typically cost between £168 and £282 in September.
The cheapest return price found within the last 5 days was £108 on Vueling (15 Sept–19 Sept).

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 1 August 2026.

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. Saturday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 6 August 2026.
Check out reviews from past customers who have flown with Vueling,Iberia, andRyanair 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.
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement
Vueling
7.2
Good
1,295 reviews
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement
Iberia
7.0
Good
3,264 reviews
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement
Ryanair
6.9
Okay
5,460 reviews
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement
easyJet
6.9
Okay
1,921 reviews
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement
British Airways
6.7
Okay
8,148 reviews
Vueling
7.2
Good
1,295 reviews
Check prices

Boarding

7.2

Entertainment

5.9

Food

6.2

Overall

7.2

Comfort

6.9

Crew

7.7

Reviews

1 / 20
2.0
Mediocre

Anonymous,Mar 2024

LGW - BCN

Rude Air hostess, looks tired...no smile, no food, not even water although i understnad its 2 hours flight. No hand luggage included in price. Worst airline ever...so tight sitting arrangement

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.

  • How long is the flight from London to Siena?

    A quick flight from London to Siena can take about 10h 35m. Vueling provides one of the quickest options available for as low as £178. The distance between London and Siena is about 756 mi. Both multi-stop and direct flights can be found to your destination and back.

  • 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 Qatar Airways (73%), British Airways (73%) or Japan Airlines (72%) 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 £160, our data shows the cheapest flight currently is £100. When looking at the most popular route, (London Heathrow - Florence Peretola), you can expect to pay £91 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.

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 10 airlines flying from London to Siena

Discover the top 10 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 6 August 2026.
AirlineCheapestAverageFlexibilityOn-time
easyJetCheapest£28Average£105FlexibilityNo cancel feeOn-time86%
Search easyJet flights
RyanairCheapest£32Average£116FlexibilityNo cancel feeOn-timeN/A
Search Ryanair flights
VuelingCheapest£65Average£155FlexibilityNo cancel feeOn-time88%
Search Vueling flights
British AirwaysCheapest£76Average£229FlexibilityNo cancel feeOn-time70%
Search British Airways flights
ITA AirwaysCheapest£129Average£161FlexibilityNo cancel feeOn-time81%
Search ITA Airways flights
LufthansaCheapest£146Average£203FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
IberiaCheapest£150Average£203FlexibilityNo cancel feeOn-time77%
Search Iberia flights
Air FranceCheapest£156Average£268FlexibilityNo cancel feeOn-time77%
Search Air France flights
KLMCheapest£158Average£267FlexibilityNo cancel feeOn-time75%
Search KLM flights
SWISSCheapest£161Average£197FlexibilityNo cancel feeOn-time79%
Search SWISS 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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