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Cheap flights from London Heathrow Airport to Chiang Mai from £252

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 13/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CNX
28 Feb — 7 Mar1
1 adult
1 adult, Economy, 0 bags

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 29 January 2026.

Wed 4/317:40
LHR
-
CNX
1 stop21h 10m
Air China
Wed 18/323:05
CNX
-
LHR
1 stop23h 50m
Air China
Deal found 27/1£372
Thu 12/317:40
LHR
-
CNX
1 stop21h 10m
Air China
Thu 19/323:05
CNX
-
LHR
1 stop23h 50m
Air China
Deal found 27/1£375
Sat 14/320:25
LHR
-
CNX
1 stop18h 25m
Air China
Sat 21/323:05
CNX
-
LHR
1 stop25h 45m
Air China
Deal found 28/1£377
Wed 4/321:00
LHR
-
CNX
1 stop18h 20m
China Eastern
Wed 18/316:25
CNX
-
LHR
2 stops32h 05m
China Eastern
Deal found 27/1£389
Tue 3/317:40
LHR
-
CNX
1 stop21h 10m
Air China
Tue 31/323:05
CNX
-
LHR
1 stop27h 20m
Air China
Deal found 27/1£391
Wed 22/420:25
LHR
-
CNX
1 stop19h 25m
Air China
Tue 19/523:05
CNX
-
LHR
1 stop27h 20m
Air China
Deal found 27/1£399
Tue 17/221:00
LHR
-
CNX
1 stop18h 20m
China Eastern
Tue 31/314:55
CNX
-
LHR
1 stop33h 45m
China Eastern
Deal found 27/1£409

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 29 January 2026.

Round-trip from

£372

One-way from

£252

Popular in

July

Cheapest in

June

Average price

£699
Air China
  • Air China
  • 4/3-18/3
  • 2 total stops
  • 45h 00m total
  • London to Chiang Mai
Search Deals
Air China
  • Air China
  • 13/3
  • 1 total stop
  • 18h 25m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£74 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 29 January 2026.
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 17/2

21:00-09:05

2 stops29h 05m

Chiang Mai

Tue 31/3

14:55-18:40

1 stop33h 45m

£414

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 2/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Sat 16/5

14:55-18:40

1 stop33h 45m

£423

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 3/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Sat 16/5

14:55-18:40

1 stop33h 45m

£423

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 2/5

21:20-15:20

2 stops36h 00m

Chiang Mai

Thu 14/5

14:55-18:40

1 stop33h 45m

£428

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 3/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Thu 14/5

16:20-18:40

2 stops32h 20m

£428

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Thu 12/3

21:00-22:20

1 stop18h 20m

Chiang Mai

Thu 19/3

10:05-17:30

2 stops38h 25m

£478

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 3/3

21:00-15:25

2 stops35h 25m

Chiang Mai

Tue 31/3

16:20-18:40

2 stops32h 20m

£484

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 2/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Mon 18/5

14:55-18:40

1 stop33h 45m

£488

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 3/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Mon 18/5

14:55-18:40

1 stop33h 45m

£488

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 13/3

20:25-21:50

1 stop18h 25m

£252

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 19 results
1
2

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 23 January 2026.

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 37 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 £408). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £627). 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.

How much does it cost for a return flight from London Heathrow Airport to Chiang Mai?

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 29 January 2026.
Get a feel of what it's like to fly with Thai Airways, Etihad Airways, andMalaysia Airlines 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.
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing
Thai Airways
7.8
Good
380 reviews
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing
Etihad Airways
7.3
Good
1,375 reviews
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing
Malaysia Airlines
7.3
Good
290 reviews
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing
China Eastern
7.2
Good
192 reviews
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing
Air China
7.2
Good
138 reviews
Thai Airways
7.8
Good
380 reviews
Check prices

Food

7.3

Boarding

7.9

Entertainment

6.8

Crew

8.3

Overall

7.8

Comfort

7.6

Reviews

1 / 20
10.0
Excellent

Virendra,Jan 2026

DEL - BKK

Having required wheel chair assistance, I received amazing service from the ground and cabin staff. Everything was a breeze. Flight was comfortable but the entertainment system was quite dated. The chicken noodles served was amazing

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. 8 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 29h 05m. There are 5598 mi between London Heathrow Airport and Chiang Mai.

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

    Flying on China Eastern is currently your cheapest option to Chiang Mai, with prices starting at £366. Additional return tickets that might be worth considering are offered by Air China and Malaysia Airlines, with the lowest prices starting at £392 and £495, respectively. Users have found that China Eastern is 49% 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?

    £270 is the cheapest one-way deal found within the past few days, from China Eastern. You may also be able to find cheap deals on Air China and Etihad Airways, with prices starting from £290 and £330, 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 £408). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £627). 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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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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Stansted to Krabi flights
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Stansted to Ko Samui flights
London City to Krabi flights
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Stansted to Chiang Mai flights
Southend to Suvarnabhumi flights
London City to Chiang Mai flights
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Luton to Chiang Mai flights
Heathrow to Rayong flights
Gatwick to Rayong flights
Heathrow to Udon Thani flights
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Heathrow to Chiang Rai flights
Southend to Krabi flights
Gatwick to Trat flights
Heathrow to Trat flights
London City to Don Mueang Intl flights
Heathrow to Hat Yai flights
Gatwick to Khon Kaen flights
Stansted to Trat flights
Gatwick to Chiang Rai flights
Gatwick to Surat Thani flights
Heathrow to Surat Thani flights

Top 8 airlines flying from Heathrow to Chiang Mai

Discover the top 8 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 29 January 2026.
AirlineCheapestAverageFlexibilityOn-time
China EasternCheapest£366Average£494FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£392Average£517FlexibilityNo cancel feeOn-time67%
Search Air China flights
Malaysia AirlinesCheapest£495Average£601FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Etihad AirwaysCheapest£518Average£644FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
EVA AirCheapest£538Average£798FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Austrian AirlinesCheapest£543Average£595FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Cathay PacificCheapest£662Average£786FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Thai AirwaysCheapest£687Average£871FlexibilityNo 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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