£36 Find Cheap Flights from London to Siena

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Siena departing on 10/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from London to Siena (LON-FLR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Siena that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from London to Siena

Tue, 21 Apr - Thu, 23 Apr
Vueling Logo
18:35 - 08:25
LGW
-
FLR
12h 50m
1 stop
Vueling Logo
07:35 - 09:00
FLR
-
LGW
2h 25mdirect
£74Vueling
Thu, 9 Apr - Thu, 16 Apr
Vueling Logo
15:25 - 21:30
LGW
-
FLR
5h 05m
1 stop
Vueling Logo
07:35 - 09:00
FLR
-
LGW
2h 25mdirect
£75Vueling
Sat, 11 Apr - Sat, 18 Apr
Multiple Airlines Logo
06:45 - 22:55
STN
-
FLR
15h 10m
1 stop
Multiple Airlines Logo
06:05 - 18:35
FLR
-
STN
13h 30m
1 stop
£110Multiple Airlines
Sat, 11 Apr - Sat, 18 Apr
Multiple Airlines Logo
12:30 - 22:55
STN
-
FLR
9h 25m
1 stop
Multiple Airlines Logo
06:05 - 18:35
FLR
-
STN
13h 30m
1 stop
£111Multiple Airlines
Sat, 18 Apr - Tue, 21 Apr
ITA Airways Logo
16:30 - 18:15
LHR
-
FLR
24h 45m
1 stop
ITA Airways Logo
11:25 - 15:40
FLR
-
LHR
5h 15m
1 stop
£124ITA Airways
Sat, 18 Apr - Tue, 28 Apr
ITA Airways Logo
16:30 - 18:15
LHR
-
FLR
24h 45m
1 stop
ITA Airways Logo
19:00 - 09:40
FLR
-
LHR
15h 40m
1 stop
£129ITA Airways
Wed, 1 Jul - Wed, 8 Jul
British Airways Logo
11:15 - 14:25
LCY
-
FLR
2h 10mdirect
British Airways Logo
15:05 - 16:20
FLR
-
LCY
2h 15mdirect
£135British Airways
Thu, 16 Apr - Wed, 22 Apr
Austrian Airlines Logo
06:00 - 14:05
LHR
-
FLR
7h 05m
1 stop
Austrian Airlines Logo
14:50 - 18:40
FLR
-
LHR
4h 50m
1 stop
£139Austrian Airlines
Wed, 22 Apr - Mon, 27 Apr
Austrian Airlines Logo
06:00 - 14:05
LHR
-
FLR
7h 05m
1 stop
Austrian Airlines Logo
07:00 - 08:20
FLR
-
LHR
26h 20m
1 stop
£142Austrian Airlines
Fri, 7 Aug - Wed, 12 Aug
British Airways Logo
13:45 - 16:55
LCY
-
FLR
2h 10mdirect
British Airways Logo
19:00 - 20:15
FLR
-
LCY
2h 15mdirect
£152British Airways
Useful Info

Good to know - Cheap tickets from London to Siena

Low seasonJanuary
Cheapest flight£36
Best time to beat the crowds (24% less expensive on average)
Most popular time to fly (19% more expensive on average)
Flight from London Gatwick Airport to Florence

When to book flights from London to Siena

Are your dates flexible? Find out the best times to travel from London to Siena based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

FAQs for booking flights from London to Siena

  • Which airports will I be using when flying from London to Siena?

    When flying out of London you’ll be using one of these airports: London City, London Gatwick, London Heathrow, London Luton or London Stansted. Siena does not have its own airport so you’ll be flying into nearby Florence Peretola airport, which is 34.5 mi away.

  • How long does a flight from London to Siena take?

    Direct flights cover the 746 miles separating London and Siena in about 2h 05m.

  • How many flights are there between London and Siena?

    21 direct flights run between London and Siena on a daily basis. On average, there are about 153 departures each week.

  • What’s the cheapest day of the week to fly between London and Siena?

    Consider leaving on a Sunday and avoid Thursdays if you're looking for the best rates. For your return to London, you’ll find the best rates on Sundays and the most expensive ones on Mondays.

  • How does KAYAK find such low prices on flights from London to Siena?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from London to Siena.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from London to Siena?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Siena from London is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from London to Siena?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to Siena with an airline and back to London with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London to Siena?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Siena from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

  • Which airlines provide the cheapest flights from London to Siena?

    In the last 72 hours, the cheapest one-way ticket between London and Siena found on KAYAK was with Vueling for £34. easyJet offered a return connection from £28 and Ryanair from £48.

Top tips for finding cheap flights from London to Siena

  • There is no airport in Siena. Instead, you’ll be flying into Florence Peretola Airport when flying between London and Siena.
  • The cheapest flight from London to Siena was found 55 days before departure, on average.
  • Book at least 1 week before departure in order to get a below-average price.
  • High season is considered to be June, July and August. The cheapest month to fly is January.

Top 5 airlines flying from London to Siena

 
Need help choosing which airline to fly with from London to Siena? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.2
VuelingOverall score based on 1247 reviews
6.8Comfort
7.2Boarding
6.2Food
7.7Crew
5.9Entertainment
Airline reviews

Not constantly changing the price DURING a booking. Felt like bait and switch.

8.0 ExcellentDouglas, Feb 2026
BCN - LGW
Read more Vueling reviews

Not constantly changing the price DURING a booking. Felt like bait and switch.

All very smooth airside. Check-in counters were understaffed. The wait is too long. Only two, then three counters were open. Waiting time of 35 minutes is too long. Pls review your rota.

To complex. So many types of fare. This made the boarding a caos.

Needs faster boarding procedure. Not their fault but should still take into account indifferent flyers.

Very fast boarding. Crew members were super nice. I loved it!

My luggage got lost and until today there is no solution to the problem. It's still missing

I am writing to demand an immediate refund and compensation for the absolutely unacceptable experience I endured with VUELING this week. On Monday, my flight was canceled, and despite this, I have yet to receive any refund. I was then taken to a hotel in a terrible location, where no food or even water was provided. The next day, I was rebooked on another flight, for which I had to personally cover an additional €50 in transportation costs—only to have that flight canceled as well. After waiting 10 hours, only 10 of us were offered alternative accommodations, while the rest were left stranded. We were forced to remain in this situation until Thursday without a single explanation or proper assistance. During this entire ordeal, we were only provided with breakfast and dinner, while being charged extra for drinks. This level of treatment is completely unacceptable. I expect an immediate refund for the cancelled flights and full compensation for the inconvenience, additional expenses, and the significant distress caused.

Only food for sale. Did not even offer water. No entertainment

Checking was efficient and quick. Adequate luggage space. Food for purchase only at high prices

Nothing. There was no flight. They cancelled the flight with no replacement about 9 hours before takeoff.

Great flight just took some time to board even when lining up early for the flight, even taking off took longer then expected.

The plane had only a few passengers, we got lucky. The crew was visibly inexperienced

Buy-on-board through the app is a great feature!

I had heard horror stories about Ryan air and was a little worried about my flights with them but I had 3 flights with them in Italy, Puglia and Sicily and it was a painless and smooth process. I was very happy.

Ryan air flight was good. Nothing to complain about. I had heard absolute horror stories about Ryan air so was worried about the flight but everything went smoothly. We have had two Ryan air flights with no problems. Last flight is Vernon come. Palermo to Milan. Fingers crossed.

Flight was delayed by 1 hour 45 minutes. Aircraft was cramped, dirty and uncomfortable. Boarding staff more interested in charging you for oversize baggage than getting you on board. Overall not a pleasant experience.

From boarding to disembarking, the whole operation was very efficient.

What we can expect? Soon we will have to travel standing on the hallway. Let me be fair, I had worse experiences with Ryanair.

A delay of almost 3 hours. It was evident that the staff wanted us to board urgently, to the point of rudeness, to avoid paying compensation

It's not the staff's fault. The cabin crew do their best but the setup in Stansted Airport by Ryanair is poor. The herding of people like cattle is unacceptable before boarding and is something that's in every airport but only in Stansted have I seen the queueing of passengers outside the plane on the tarmac and the crew only turning up with maybe 5 minutes to depart. This is a resource issue . Yes prices are good but seemingly comes with a price of poor treatment of customers. I'll pay more next time

Sat at rear of aircraft and was very cold. As a frequent flyer for many years, this is was the coldest I have ever been. Other passengers and some crew were complaining how cold it was. Sitting near the doors always risks being colder, just the way the aircraft works - but this was exceptional, bring a good jumper. Everything else was pretty standard easyJet - good value low cost carrier.

The best budget airline in Europe. Flight was on time, crew friendly and worked hard during flight and were able to meet our needs. Only downside (not the airline's fault), there were no rear steps.

It was transportation nothing more. I will give a positive rating over Ryanair. We missed our Ryanair flight the night before and received rude and unconcerned treatment from the Ryanair customer service. It was late. We were very tired and stressed after doing our best to get to the airport. The so called customer service ladies were completely unconcerned from the start. Aside from that, the flight to London seemed to be their opportunity for advertising. No time to relax as attendants were constantly in the aisle selling. I will never fly Ryanair again!!

Boarding could be better. To get through your gate but to be stood in a corridor for 20 minutes is not great.

The true is that travel from London to Faro on 11/12/2025 by BA was cancelled, so I did not go to Faro, so i did not board easy flight. The mediocre qualification to you was because even when i bought an insurance, i could not change date neither obtain reimbursement. It could be ideal if you do something in order for me not to lose the purchase Thank you

Queuing for quite a while despite using the "speedy boarding".

Would not advise EasyJet for a 5 hour flight…small plane and hence a lot of turbulence. No inflight entertainment so struggle to pass time in cramped seats. We also fell victim to extra charge for our cabin bags, although bag dimensions were ok, but the handle was rigid and slightly fell outside their testing cage!!….never again will we fly with this airline and be party to their scams for making money!

The food and so are to expensive and old . Crew whas not very friendly . Apparently some other passenger can just Push through the waiting people to board while almost punching me and a father with a child down the stairs. Its always something with easy jet . The seats of row 26 where lose . And for a guy of my size there is absolutely no leg room at all .

Nice to fly out of Orly smaller easier to navigate airport. Being able to receive boarding pass well in advance of trip was comforting to know all travel was in order.

Liked. The check-in was pretty quick as they had 5 desks working.

Flight map did not work. Crew was great, food was good, plane took off on time and landed early. That's all I can ask.

Paid for exit row at the back of the plane. Window seat with lots of leg space. Food was inedible (as usual). Brought my own.

Efficiency of staff, and comfort and cleanliness of aircraft was all great. Maybe a hot drink without payment at that time in the morning would be good!

The plane was late (as was my flight out from Birmingham the day before)

Boarding and flight update was fantastic as I experienced about a 10-15 delayed for both flights. The food served onboard was great; the service of the flight attendants was excellent.

The flight was delayed by an hour. Made the connection uncomfortably tight.

Complete mess. Our reservation was mistakenly cancelled. After almost missing the connection and walking all over the Munich airport, the Service desk got involved and we were run to our flight. Not all 4 of us in Business and not seated together as originally booked. This was the worst treatment I have ever had. And I travel a lot. 1K million miler.

When we went to the lounge they told us to go into the main lounge and not the full business class section, later they told me that Lufthansa wont pay the full fee to alloq the business class passengers entry to the nicer sectikn where all the other airlines nusiness class passengers go into. Very poor arrangement.

Not what I expected for the last leg of a $5100 business class experience. Boarding was a nightmare. The flight was delayed and I had to keep checking my email to ensure I was at the right gate since the airline or the terminal had no clue until 15 mins prior to boarding. Food was gross, limited drink options.

Flights scheduled with impossible connections - Lufthansa apparently believes it takes 7mins to change terminals, go through passport control, re-clear security and walk 1.8kms…..and everything will work perfectly (which it never does at Frankfurt). No staff on hand to assist with transfers on delayed flights. No transfer guidance provided by app. No compensation offered for 6hr delay to connecting flight.

The luggage problem I previously mentioned was actually this flight

The flight was delayed due to snow in Frankfurt. There wasn't much information from BA or the airport, but Kayak was great and kept me informed of the delay and gate changes.

Late takeoff, but on time landing. Lost bags, 3 days to find them, still in transit to my location. Power outlets broken, Wi-Fi not working, so much for working on the long flight.

Good. For a long flight. The comfort of the seat could be better. Also, the food was « normal » plane food. Not indian plane food unfortunately! Everything else was smooth and great.

The seats were comfortable. So many empty seats allowed for stretching out and sleeping. The onboard entertainment was pretty good. The cabin crew were so kind and kept the passengers well- hydrated, and well fed.

We had American Airlines on our return and it was confusing if we were going with Aa or BA I had 2 different flight numbers and didn’t get our gate until it was boarding. So we were a bit nervous as the which it was

No WiFi. No food. 250 ml of water only drink option. No entertainment options. Extremely bare bones flight

Economy seats were good and spacious. Much better than virgin by a mile.

It’s the old style plane with the old Ying Yang seats doesn’t compare to other airlines with newer planes.

I was unable to board this flight because of visa changes that I was not alerted about and I’ve been unable to contact Kayak to obtain a refund / credit anything.

Everything you need to know for your flight from London to Siena

Complete your trip to Siena with a hotel stay or car hire