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Cheap flights from London Heathrow Airport to Chiang Mai from £278

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 8/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CNX
7 May — 14 May1
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 7 April 2026.

Wed 13/522:40
LHR
-
CNX
1 stop17h 10m
Air China
Tue 26/523:05
CNX
-
LHR
1 stop27h 20m
Air China
Deal found 4/4£451
Mon 2/1121:00
LHR
-
CNX
1 stop34h 20m
China Eastern
Sun 15/1115:35
CNX
-
LHR
1 stop32h 55m
China Eastern
Deal found 6/4£460
Thu 29/1021:00
LHR
-
CNX
1 stop34h 20m
China Eastern
Sun 8/1115:35
CNX
-
LHR
1 stop32h 55m
China Eastern
Deal found 4/4£461
Thu 26/1121:00
LHR
-
CNX
2 stops35h 25m
China Eastern
Mon 21/1215:35
CNX
-
LHR
1 stop32h 55m
China Eastern
Deal found 5/4£466
Wed 20/522:40
LHR
-
CNX
1 stop17h 10m
Air China
Thu 4/623:05
CNX
-
LHR
1 stop27h 20m
Air China
Deal found 3/4£475
Thu 12/1121:00
LHR
-
CNX
1 stop34h 20m
China Eastern
Thu 10/1215:35
CNX
-
LHR
1 stop32h 55m
China Eastern
Deal found 6/4£477

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 7 April 2026.

Round-trip from

£451

One-way from

£278

Popular in

July

Cheapest in

May

Average price

£658
Air China
  • Air China
  • 13/5-26/5
  • 2 total stops
  • 44h 30m total
  • London to Chiang Mai
Search Deals
Air China
  • Air China
  • 8/6
  • 1 total stop
  • 17h 10m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (£70 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£17 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 7 April 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Chiang Mai that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Wed 13/5

21:20-13:25

1 stop34h 05m

Chiang Mai

Tue 26/5

10:05-18:40

3 stops62h 35m

£645

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 29/5

10:00-13:45

2 stops21h 45m

Chiang Mai

Mon 8/6

10:10-06:55

2 stops26h 45m

£799

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Mon 4/5

14:25-19:10

2 stops22h 45m

Chiang Mai

Thu 4/6

10:10-07:05

2 stops26h 55m

£824

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 28/4

21:20-09:15

3 stops29h 55m

Chiang Mai

Mon 25/5

16:10-18:40

3 stops56h 30m

£830

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Thu 14/5

21:20-09:15

2 stops29h 55m

Chiang Mai

Tue 26/5

16:10-18:40

3 stops56h 30m

£830

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Mon 1/6

21:20-15:20

2 stops36h 00m

Chiang Mai

Sat 20/6

14:55-18:40

1 stop33h 45m

£833

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sat 18/4

16:50-13:45

2 stops38h 55m

Chiang Mai

Tue 21/4

10:10-18:40

2 stops38h 30m

£837
Fastest return journey

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 15/5

14:25-19:10

2 stops22h 45m

Chiang Mai

Mon 1/6

20:00-14:25

2 stops24h 25m

£837

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 15/5

14:25-19:10

2 stops22h 45m

Chiang Mai

Sun 31/5

20:00-16:10

2 stops26h 10m

£837

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 2/6

21:20-15:20

3 stops36h 00m

Chiang Mai

Sat 20/6

10:05-18:40

3 stops38h 35m

£838

Flights are sorted by cheapest return flights first.

Deals found on 2/4

Showing 1-10 of 19 resultsSorted by cheapest first
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 3 April 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 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £390). Flying from London Heathrow Airport to Chiang Mai in December is currently the most expensive (average of £633). 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 7 April 2026.
Get a feel of what it's like to fly with Thai Airways,Malaysia Airlines, 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.
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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
395 reviews
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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
7.4
Good
305 reviews
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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
1,428 reviews
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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
7.3
Good
146 reviews
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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
200 reviews
Thai Airways
7.8
Good
395 reviews
Check prices

Food

7.4

Overall

7.8

Boarding

7.9

Entertainment

6.9

Comfort

7.6

Crew

8.4

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 21h 45m. 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 Eastern is currently your cheapest option to Chiang Mai, with prices starting at £382. Additional return tickets that might be worth considering are offered by Air China and Malaysia Airlines, with the lowest prices starting at £399 and £517, 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?

    £281 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 £284 and £344, 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, March is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £390). Flying from London Heathrow Airport to Chiang Mai in December is currently the most expensive (average of £633). 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

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

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 7 April 2026.
AirlineCheapestAverageFlexibilityOn-time
China EasternCheapest£382Average£548FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£399Average£510FlexibilityNo cancel feeOn-time67%
Search Air China flights
Malaysia AirlinesCheapest£517Average£614FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Etihad AirwaysCheapest£538Average£660FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Austrian AirlinesCheapest£566Average£621FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
EVA AirCheapest£611Average£832FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Cathay PacificCheapest£691Average£804FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Thai AirwaysCheapest£735Average£920FlexibilityNo 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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