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Cheap flights from London Heathrow Airport to Chiang Mai from £242

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 8/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CNX
20 Nov — 27 Nov1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from London Heathrow to Chiang Mai are usually found in May or June, booked 44 days in advance, depart on a Sunday or Monday and return on a Monday

Cheap flight deals from Heathrow to Chiang Mai

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Chiang Mai (CNX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated 21 October 2025.

Round-trip from

£489

One-way from

£242

Popular in

July

Cheapest in

May

Average price

£703
Air China
  • Air China
  • 3/12-10/12
  • 2 total stops
  • 46h 55m total
  • London to Chiang Mai
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8/3
  • 8/3
  • 3 total stops
  • 24h 20m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£78 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£16 potential savings vs. average return price).
Search Deals
Average for round-trip flights in October 2025
Search Deals

Find flight deals from Heathrow to Chiang Mai

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Chiang Mai
Explore the most affordable flight options available from Heathrow to Chiang Mai. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 21 October 2025.

Wed 3/1217:40LHR - CNX
1 stop21h 10mAir China
Wed 10/1223:05CNX - LHR
1 stop25h 45mAir China
Deal found 19/10£489
Sat 6/1217:40LHR - CNX
1 stop21h 10mAir China
Sat 13/1223:05CNX - LHR
1 stop25h 45mAir China
Deal found 19/10£490
Fri 7/1117:40LHR - CNX
1 stop21h 10mAir China
Sun 23/1123:05CNX - LHR
1 stop23h 50mAir China
Deal found 20/10£491
Wed 24/1217:40LHR - CNX
1 stop21h 10mAir China
Wed 7/123:05CNX - LHR
1 stop23h 50mAir China
Deal found 19/10£494
Tue 18/1121:00LHR - CNX
2 stops29h 05mMultiple Airlines
Tue 25/1108:50CNX - LHR
1 stop28h 50mMultiple Airlines
Deal found 19/10£500
Tue 18/1122:00LHR - CNX
1 stop36h 50mChina Southern
Sun 14/1218:50CNX - LHR
2 stops30h 45mChina Southern
Deal found 20/10£512
Tue 18/1121:00LHR - CNX
2 stops29h 05mChina Eastern
Sun 14/1216:25CNX - LHR
2 stops32h 05mChina Eastern
Deal found 20/10£514
Fri 7/1117:40LHR - CNX
1 stop21h 10mAir China
Tue 18/1123:05CNX - LHR
1 stop25h 45mAir China
Deal found 20/10£517
Fri 14/1117:40LHR - CNX
1 stop21h 10mAir China
Fri 21/1123:05CNX - LHR
1 stop25h 45mAir China
Deal found 20/10£518
Thu 6/1121:00LHR - CNX
2 stops35h 25mChina Eastern
Wed 3/1210:05CNX - LHR
2 stops38h 25mChina Eastern
Deal found 20/10£519
Sat 8/1121:00LHR - CNX
2 stops29h 05mChina Eastern
Fri 5/1210:05CNX - LHR
3 stops38h 25mChina Eastern
Deal found 20/10£520

Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Chiang Mai 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 October 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Chiang Mai that are best for you.

Fly from

Heathrow

Fly to

Chiang Mai

Route

Depart

Return

Price

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 3/3

20:25-21:50

1 stop18h 25m

Chiang Mai

Sat 7/3

23:05-15:55

1 stop23h 50m

£494

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 7/11

17:40-21:50

1 stop21h 10m

Chiang Mai

Tue 18/11

23:05-15:55

1 stop23h 50m

£518

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 8/11

21:00-09:05

2 stops29h 05m

Chiang Mai

Fri 5/12

10:05-17:30

3 stops38h 25m

£520

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 11/1

21:00-09:05

2 stops29h 05m

Chiang Mai

Wed 11/2

16:25-17:30

2 stops32h 05m

£520

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 8/11

21:00-09:05

2 stops29h 05m

Chiang Mai

Tue 25/11

16:25-17:30

2 stops32h 05m

£528

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 18/11

21:30-17:50

2 stops37h 20m

Chiang Mai

Tue 25/11

18:50-18:35

1 stop30h 45m

£529

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 18/11

21:00-09:05

2 stops29h 05m

Chiang Mai

Tue 25/11

16:25-17:30

2 stops32h 05m

£543

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 7/11

21:00-15:25

2 stops35h 25m

Chiang Mai

Tue 18/11

16:25-17:30

2 stops32h 05m

£575

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 3/3

21:00-14:20

1 stop34h 20m

Chiang Mai

Sat 7/3

10:05-17:30

2 stops38h 25m

£590

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 18/11

19:20-06:05

1 stop27h 45m

Chiang Mai

Tue 25/11

08:50-12:05

1 stop34h 15m

£595

Flights are sorted by cheapest return flights first.

Deals found on 19/10

Showing 1-10 of 23 results
1
2
3

Best time to book a flight from Heathrow to Chiang Mai

Have a flexible travel schedule? Discover the best time to fly to Chiang Mai from Heathrow 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 Heathrow Airport to Chiang Mai

How far ahead should I book a flight from London Heathrow Airport to Chiang Mai?

Use this chart to determine the optimal time to book a return flight from Heathrow to Chiang Mai. Price data was last updated on 17 October 2025.

The price you pay for your flight from London Heathrow Airport to Chiang Mai may vary depending on when you book. For the best chance of a lower fare, look to book 44 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 London Heathrow Airport to Chiang Mai?

Currently, October is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £425). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £649). 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 LHR to CNX?

Find hourly flight availability from Heathrow to Chiang Mai. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 21 October 2025.

It’s typically best to fly out from London Heathrow Airport to Chiang Mai in the afternoon. Doing so could potentially save you 71% on the flight price compared to flying at midday, which is usually more expensive.

Reviews of airlines servicing Chiang Mai

Get insights into the airlines that provide service to Chiang Mai. 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 Chiang Mai. Reviews last updated 21 October 2025.
Get a feel of what it's like to fly with EVA Air, Thai Airways, andEtihad Airways from London Heathrow Airport to Chiang Mai by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
EVA Air
8.4
Very Good
1,254 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Thai Airways
7.8
Good
360 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Etihad Airways
7.4
Good
1,281 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Malaysia Airlines
7.3
Good
278 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak
Air China
7.2
Good
115 reviews
EVA Air
8.4
Very Good
1,254 reviews
Check prices

Comfort

8.3

Overall

8.4

Boarding

8.4

Crew

8.6

Entertainment

8.0

Food

8.1

Reviews

1 / 20
6.0
Good

Anonymous,Aug 2025

BKK - TPE

I bought tickets for myself and my friend and had to argue with the checkin person to get our seats together for the return flights I purchased the tickets together weeks ahead of time and did not expect to have to ask for a supervisor to sit together very disappointed in booking through kayak

Related info for your journey

Find useful and relevant information for your journey from Heathrow to Chiang Mai. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Chiang Mai from London Heathrow?

    For a flight from London Heathrow to Chiang Mai, you will be flying into Chiang Mai. Chiang Mai (CNX) is just 1.9 mi from the center of the city. Chiang Mai is the only Chiang Mai airport and it handles 0 inbound flights from London Heathrow per day. 9 airlines have flights to Chiang Mai from London Heathrow on a regular basis.

  • How long is the flight from London Heathrow Airport to Chiang Mai?

    Departing from London Heathrow Airport to Chiang Mai will take you 18h 25m. There are 5598 mi between London Heathrow Airport and Chiang Mai. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from London Heathrow Airport to Chiang Mai round-trip?

    Flying on China Southern is currently your cheapest option to Chiang Mai, with prices starting at £424. Additional return tickets that might be worth considering are offered by China Eastern and Air China, with the lowest prices starting at £456 and £456, respectively. Users have found that China Southern is 44% cheaper than the other options available to this destination.

  • Can I find deals for flights from Heathrow to Chiang Mai that include hotel bookings?

    Yes. In addition to deals on Heathrow to Chiang Mai flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Chiang Mai?

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

  • Can I find deals for business class flights from Heathrow to Chiang Mai?

    Yes. Cheapflights offers flight deals from Heathrow to Chiang Mai 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 Heathrow Airport to Chiang Mai?

    Currently, October is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £425). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £649). 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 Heathrow to Chiang Mai

See prices for flight routes from nearby airports that may be better suited for you.
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Top 9 airlines flying from Heathrow to Chiang Mai

Discover the top 9 airlines that operate flights from Heathrow to Chiang Mai. 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 October 2025.
AirlineCheapestAverageFlexibilityOn-time
China SouthernCheapest£424Average£468FlexibilityNo cancel feeOn-time69%
Search China Southern flights
China EasternCheapest£456Average£547FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£456Average£559FlexibilityNo cancel feeOn-time67%
Search Air China flights
Etihad AirwaysCheapest£539Average£670FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Malaysia AirlinesCheapest£553Average£788FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Austrian AirlinesCheapest£612Average£773FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Cathay PacificCheapest£681Average£855FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
EVA AirCheapest£692Average£744FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Thai AirwaysCheapest£700Average£848FlexibilityNo cancel feeOn-time77%
Search Thai Airways 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 Heathrow to Chiang Mai?

Cheapflights helps you search for flights from Heathrow to Chiang Mai 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 Heathrow to Chiang Mai?

Cheapflights helps you find that perfect flight to Chiang Mai from Heathrow by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Heathrow to Chiang Mai with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Heathrow to Chiang Mai, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Heathrow to Chiang Mai become cheaper?

Yes, Cheapflights offers price alerts on Heathrow to Chiang Mai 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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