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

LHR — CNX
24 Sep — 1 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 30/820:25 -
1 stop19h 25m
Mon 7/923:05 -
1 stop27h 20m
Deal found 23/8£386
Fri 2/1022:10 -
1 stop37h 40m
Tue 13/1018:50 -
1 stop30h 30m
Deal found 24/8£386
Sun 29/1120:25 -
1 stop18h 25m
Wed 2/1223:05 -
1 stop25h 45m
Deal found 24/8£389
Wed 4/1120:25 -
1 stop18h 25m
Tue 17/1123:05 -
1 stop25h 45m
Deal found 23/8£392
Tue 3/1120:25 -
1 stop18h 25m
Fri 13/1123:05 -
1 stop25h 45m
Deal found 23/8£394
Sat 28/1117:40 -
1 stop21h 10m
Wed 2/1223:05 -
1 stop25h 45m
Deal found 24/8£402
Mon 2/1120:25 -
1 stop18h 25m
Thu 12/1123:05 -
1 stop23h 50m
Deal found 23/8£408
Sun 15/1117:40 -
1 stop21h 10m
Mon 30/1123:05 -
1 stop25h 45m
Deal found 23/8£415
Mon 21/922:40 -
1 stop17h 10m
Mon 12/1023:05 -
1 stop27h 20m
Deal found 23/8£430
Mon 21/922:40 -
1 stop17h 10m
Mon 28/923:05 -
1 stop24h 35m
Deal found 24/8£435
Wed 25/1121:00 -
1 stop34h 20m
Fri 11/1215:35 -
1 stop32h 55m
Deal found 21/8£438
Sun 1/1117:40 -
1 stop21h 10m
Sun 22/1123:05 -
1 stop25h 45m
Deal found 23/8£440

Find flight deals from Heathrow to Chiang Mai

Round-trip from

£386

One-way from

£252

Popular in

July

Cheapest in

November

Average price

£884
China Southern
  • China Southern
  • 2/10-13/10
  • 2 total stops
  • 68h 10m total
  • London to Chiang Mai
Search Deals
27/9
  • 27/9
  • 2 total stops
  • 29h 55m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£76 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 4% potential price decrease (£22 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 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
Fastest return journey

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Wed 25/11

13:45-13:45

2 stops17h 00m

Chiang Mai

Fri 11/12

10:10-21:40

2 stops18h 30m

£712

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Thu 7/1

20:55-06:05

1 stop26h 10m

Chiang Mai

Sun 16/5

09:30-12:45

1 stop33h 15m

£770

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sun 20/9

14:45-19:10

2 stops22h 25m

Chiang Mai

Fri 30/10

09:10-18:10

1 stop16h 00m

£802

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Thu 8/10

09:05-11:15

2 stops20h 10m

Chiang Mai

Thu 15/10

10:10-12:25

2 stops32h 15m

£837

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sat 28/11

19:20-09:25

2 stops31h 05m

Chiang Mai

Wed 2/12

09:10-06:40

1 stop28h 30m

£876

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sun 20/9

18:10-11:15

2 stops35h 05m

Chiang Mai

Fri 30/10

19:45-15:15

2 stops50h 30m

£969

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Tue 5/1

19:20-13:45

2 stops35h 25m

Chiang Mai

Sun 16/5

09:30-15:05

1 stop35h 35m

£998

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sat 26/12

20:55-06:05

1 stop26h 10m

Chiang Mai

Thu 14/1

09:10-06:40

1 stop28h 30m

£1,106

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Thu 31/12

13:55-06:05

1 stop33h 10m

Chiang Mai

Thu 14/1

12:10-06:40

2 stops25h 30m

£1,117

LondonChiang Mai

LHR London Heathrow - CNX Chiang Mai

LHRCNX

London Heathrow

Sat 28/11

08:05-11:20

2 stops20h 15m

Chiang Mai

Wed 2/12

19:45-14:00

2 stops25h 15m

£1,140

Flights are sorted by cheapest return flights first.

Deals found on 24/8

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 £532). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,060). 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 £709 and £890 in October.
The cheapest return price found within the last 5 days was £386 on China Southern (2 Oct–13 Oct).

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
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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
417 reviews
Thai Airways
7.9
Good
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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
951 reviews
Thai Airways
7.9
Good
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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
7.4
Good
161 reviews
Thai Airways
7.9
Good
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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
1,515 reviews
Thai Airways
7.9
Good
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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
234 reviews
Thai Airways
7.9
Good
417 reviews
Check prices

Crew

8.4

Boarding

8.0

Food

7.5

Overall

7.9

Comfort

7.7

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. 6 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 17h. 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 £371. Additional return tickets that might be worth considering are offered by Air China and Malaysia Airlines, with the lowest prices starting at £386 and £499, 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?

    £273 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 £275 and £334, 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 £532). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,060). 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 6 airlines flying from Heathrow to Chiang Mai

AirlineCheapestAverageFlexibilityOn-time
China EasternCheapest£371Average£466FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£386Average£486FlexibilityNo cancel feeOn-time67%
Search Air China flights
Malaysia AirlinesCheapest£499Average£608FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Etihad AirwaysCheapest£524Average£626FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
Austrian AirlinesCheapest£549Average£645FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
Thai AirwaysCheapest£753Average£929FlexibilityNo 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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