Cheap flights from London Heathrow Airport to Chiang Mai from £332

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 17/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CNX
11 Jan — 18 Jan1
1 adult
1 adult, Economy, 0 bags

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

Cheap 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 12 December 2025.

Fri 26/1221:00LHR - CNX
2 stops29h 05mMultiple Airlines
Sun 18/108:50CNX - LHR
1 stop16h 20mMultiple Airlines
Deal found 10/12£823
Fri 26/1221:00LHR - CNX
2 stops29h 05mChina Eastern
Sun 18/116:25CNX - LHR
2 stops32h 05mChina Eastern
Deal found 10/12£879
Sat 27/1217:40LHR - CNX
1 stop21h 10mAir China
Tue 27/123:05CNX - LHR
1 stop23h 50mAir China
Deal found 10/12£961
Mon 29/1221:00LHR - CNX
1 stop34h 20mChina Eastern
Wed 4/223:20CNX - LHR
1 stop25h 10mChina Eastern
Deal found 11/12£963
Thu 11/1206:40LHR - CNX
2 stops20h 35mMultiple Airlines
Tue 23/1217:20CNX - LHR
1 stop20h 20mMultiple Airlines
Deal found 10/12£964
Fri 19/1206:40LHR - CNX
3 stops25h 05mMultiple Airlines
Mon 5/106:30CNX - LHR
3 stops31h 40mMultiple Airlines
Deal found 10/12£966
Sat 27/1220:05LHR - CNX
2 stops19h 55mMultiple Airlines
Mon 5/106:30CNX - LHR
3 stops31h 40mMultiple Airlines
Deal found 10/12£970
Mon 22/1217:40LHR - CNX
1 stop21h 10mAir China
Tue 30/1223:05CNX - LHR
1 stop25h 45mAir China
Deal found 11/12£981
Wed 10/1221:20LHR - CNX
1 stop14h 40mEVA Air
Wed 17/1212:10CNX - LHR
1 stop37h 55mEVA Air
Deal found 10/12£993
Fri 26/1222:05LHR - CNX
1 stop37h 45mCathay Pacific
Mon 12/110:35CNX - LHR
1 stop35h 25mCathay Pacific
Deal found 10/12£1,002

Find 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 12 December 2025.

Round-trip from

£420

One-way from

£332

Popular in

July

Cheapest in

June

Average price

£776
China Eastern
  • China Eastern
  • 28/1-2/3
  • 3 total stops
  • 72h 45m total
  • London to Chiang Mai
17/1
  • 17/1
  • 2 total stops
  • 36h 50m total
  • London to Chiang Mai
Highest demand for flights based on searches. 10% potential increase in price (£69 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£17 potential savings vs. average return price).
Average for round-trip flights in December 2025

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 12 December 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

Sun 25/1

17:40-21:50

1 stop21h 10m

Chiang Mai

Sun 1/2

23:05-17:50

1 stop25h 45m

£457

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Mon 26/1

17:40-21:50

1 stop21h 10m

Chiang Mai

Sun 22/3

23:05-15:55

1 stop23h 50m

£462

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 1/3

20:25-21:50

1 stop18h 25m

Chiang Mai

Wed 18/3

23:05-15:55

1 stop23h 50m

£462

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Thu 19/2

21:00-22:20

1 stop18h 20m

Chiang Mai

Thu 5/3

16:25-17:30

2 stops32h 05m

£481

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 10/1

21:00-14:20

1 stop34h 20m

Chiang Mai

Sat 17/1

08:50-18:10

1 stop16h 20m

£487

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Mon 26/1

17:40-21:50

1 stop21h 10m

Chiang Mai

Wed 4/3

23:05-15:55

1 stop23h 50m

£494

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Wed 4/2

21:00-09:05

2 stops29h 05m

Chiang Mai

Sun 8/2

10:05-17:30

2 stops38h 25m

£518

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 11/4

09:30-05:55

1 stop14h 25m

Chiang Mai

Sat 25/4

08:45-12:45

1 stop34h 00m

£556

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Wed 14/1

21:00-09:05

2 stops29h 05m

Chiang Mai

Sat 24/1

15:35-17:30

1 stop32h 55m

£577

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 17/1

08:50-06:05

1 stop14h 15m

Chiang Mai

Sat 7/2

08:50-14:30

1 stop36h 40m

£586

Flights are sorted by cheapest return flights first.

Deals found on 10/12

Showing 1-10 of 21 results
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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 5 December 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 £423). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £647). 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 12 December 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 12 December 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.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

Entertainment

8.0

Food

8.1

Comfort

8.3

Crew

8.6

Boarding

8.4

Overall

8.5

Reviews

1 / 20
10.0
Excellent

Anonymous,Nov 2025

TPE - CRK

All was okay except for the medical emergency that happened before our boarding. I wish that the medical emergency response was more immediate.

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 20m. 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 £421. Additional return tickets that might be worth considering are offered by Air China and China Eastern, with the lowest prices starting at £427 and £463, respectively. Users have found that China Southern is 44% cheaper than the other options available to this destination.

  • What are the cheapest airlines to fly from London Heathrow Airport to Chiang Mai one-way?

    £310 is the cheapest one-way deal found within the past few days, from Air China. You may also be able to find cheap deals on Etihad Airways and EVA Air, with prices starting from £375 and £425, respectively.

  • 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 £423). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £647). 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

Browse thousands of different options on Cheapflights for your next trip

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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 12 December 2025.
AirlineCheapestAverageFlexibilityOn-time
China SouthernCheapest£421Average£525FlexibilityNo cancel feeOn-time69%
Search China Southern flights
Air ChinaCheapest£427Average£578FlexibilityNo cancel feeOn-time67%
Search Air China flights
China EasternCheapest£463Average£548FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Etihad AirwaysCheapest£539Average£666FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Malaysia AirlinesCheapest£553Average£626FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Austrian AirlinesCheapest£559Average£657FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
EVA AirCheapest£604Average£744FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Cathay PacificCheapest£682Average£815FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Thai AirwaysCheapest£702Average£841FlexibilityNo 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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