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Cheap flights from London Heathrow Airport to Chiang Mai from £310

LHR — CNX
18 Oct — 25 Oct1
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

Sun 20/920:25 -
1 stop19h 25m
Mon 19/1023:05 -
1 stop27h 20m
Deal found 16/9£375
Tue 29/922:40 -
1 stop17h 10m
Wed 9/1223:05 -
1 stop23h 50m
Deal found 18/9£379
Mon 2/1120:25 -
1 stop18h 25m
Wed 18/1123:05 -
1 stop25h 45m
Deal found 17/9£387
Mon 19/1022:40 -
1 stop17h 10m
Mon 23/1118:10 -
1 stop28h 45m
Deal found 15/9£389
Mon 19/1022:40 -
1 stop17h 10m
Wed 28/1023:05 -
1 stop23h 50m
Deal found 14/9£390
Sun 27/920:25 -
1 stop19h 25m
Wed 30/923:05 -
1 stop27h 20m
Deal found 14/9£392

Find flight deals from Heathrow to Chiang Mai

Round-trip from

£379

One-way from

£310

Popular in

July

Cheapest in

November

Average price

£669
Air China
  • Air China
  • 29/9-9/12
  • 2 total stops
  • 41h 00m total
  • London to Chiang Mai
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China Eastern
  • China Eastern
  • 18/11-31/12
  • 1 total stop
  • 34h 20m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 14% potential increase in price (£94 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£26 potential savings vs. average return price).
Search Deals
Average for round-trip flights in September 2026
Search Deals

Cheapflights Fare Finder

 
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 London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Wed 18/11

21:00-14:20

1 stop34h 20m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£310

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Wed 11/11

21:00-15:25

2 stops35h 25m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£313

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Tue 22/9

21:20-09:15

3 stops29h 55m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£314

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Fri 25/9

21:20-09:15

3 stops29h 55m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£314

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Thu 24/9

21:20-08:10

3 stops28h 50m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£322

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sun 25/10

21:00-12:00

2 stops32h 00m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£359
Fastest return journey

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Thu 5/11

17:45-21:50

1 stop21h 05m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£367

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sun 1/11

17:45-07:20

3 stops30h 35m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£384

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Wed 11/11

09:00-19:00

3 stops27h 00m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£401

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Mon 16/11

09:00-17:45

3 stops25h 45m

Chiang Mai

Wed 31/12

00:00-18:00

Nonstop0h 00m

£420

Flights are sorted by cheapest return flights first.

Deals found on 18/9

Showing 1-10 of 21 resultsSorted by cheapest first
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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

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?

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 31 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £546). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,145). 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?

Airfare is below average for this route at the moment.

London Heathrow Airport to Chiang Mai flights typically cost between £647 and £829 in September.
The cheapest return price found within the last 5 days was £379 on Air China (29 Sept–9 Dec).

Reviews of airlines servicing Chiang Mai

Get a feel of what it's like to fly with Thai Airways,Austrian Airlines, andAir China 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
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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
7.9
Good
420 reviews
Thai Airways
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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
Austrian Airlines
7.6
Good
962 reviews
Thai Airways
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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
7.5
Good
166 reviews
Thai Airways
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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
1,535 reviews
Thai Airways
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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
7.3
Good
243 reviews
Thai Airways
7.9
Good
420 reviews
Check prices

Crew

8.5

Boarding

8.0

Overall

7.9

Comfort

7.7

Food

7.5

Entertainment

6.9

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

  • 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. 7 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 22h 50m. 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 £378. Additional return tickets that might be worth considering are offered by Air China and Malaysia Airlines, with the lowest prices starting at £394 and £509, respectively. Users have found that China Eastern is 50% 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?

    £278 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 £280 and £341, 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, November is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £546). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,145). 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

Top 7 airlines flying from Heathrow to Chiang Mai

AirlineCheapestAverageFlexibilityOn-time
China EasternCheapest£378Average£475FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£394Average£493FlexibilityNo cancel feeOn-time67%
Search Air China flights
Malaysia AirlinesCheapest£509Average£620FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Etihad AirwaysCheapest£532Average£665FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Austrian AirlinesCheapest£560Average£658FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Cathay PacificCheapest£688Average£790FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Thai AirwaysCheapest£788Average£955FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

Fly with Cheapflights

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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