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Cheap flights from London Heathrow Airport to Chiang Mai from £305

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 29/1. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CNX
20 Aug — 27 Aug1
1 adult

Cheapflights Tip: The best prices from London Heathrow to Chiang Mai are usually found in October or February, booked 5 days in advance, depart on a Sunday or Monday and return on a Monday

Cheap 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 15 August 2025.

Round-trip from

£530

One-way from

£305

Popular in

July

Cheapest in

October

Average price

£911
Air China
  • Air China
  • 5/11-5/12
  • 2 total stops
  • 46h 55m total
  • London to Chiang Mai
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29/1
  • 29/1
  • 3 total stops
  • 43h 20m total
  • London to Chiang Mai
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (£79 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 August 2025
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Find flight deals from Heathrow to Chiang Mai

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 15 August 2025.

Wed 5/1117:40LHR - CNX
1 stop21h 10mAir China
Fri 5/1223:05CNX - LHR
1 stop25h 45mAir China
Deal found 13/8£530
Sun 2/1117:15LHR - CNX
2 stops41h 35mChina Southern
Sun 30/1118:50CNX - LHR
1 stop30h 25mChina Southern
Deal found 14/8£531
Wed 5/1120:25LHR - CNX
1 stop18h 25mAir China
Wed 3/1223:05CNX - LHR
1 stop23h 50mAir China
Deal found 14/8£532
Tue 4/1120:55LHR - CNX
1 stop26h 10mEtihad Airways
Tue 2/1208:50CNX - LHR
1 stop16h 20mEtihad Airways
Deal found 14/8£533
Tue 4/1120:55LHR - CNX
1 stop26h 10mEtihad Airways
Thu 4/1208:50CNX - LHR
1 stop16h 20mEtihad Airways
Deal found 14/8£534
Wed 5/1120:25LHR - CNX
1 stop18h 25mAir China
Tue 2/1223:05CNX - LHR
2 stops51h 35mAir China
Deal found 14/8£535
Tue 4/1122:00LHR - CNX
1 stop36h 50mChina Southern
Fri 5/1218:50CNX - LHR
1 stop30h 25mChina Southern
Deal found 13/8£540
Fri 31/1022:00LHR - CNX
1 stop36h 50mChina Southern
Sun 30/1118:50CNX - LHR
1 stop30h 25mChina Southern
Deal found 14/8£548
Tue 4/1119:20LHR - CNX
1 stop27h 45mEtihad Airways
Sat 29/1108:50CNX - LHR
1 stop36h 40mEtihad Airways
Deal found 13/8£553
Mon 1/921:20LHR - CNX
2 stops29h 45mChina Eastern
Mon 13/1014:55CNX - LHR
1 stop33h 45mChina Eastern
Deal found 13/8£555
Sun 2/1121:00LHR - CNX
2 stops35h 25mChina Eastern
Mon 1/1215:35CNX - LHR
1 stop32h 55mChina Eastern
Deal found 13/8£557

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 15 August 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 2/11

17:15-17:50

2 stops41h 35m

Chiang Mai

Mon 1/12

18:50-18:15

1 stop30h 25m

£531

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Sun 2/11

17:15-17:50

2 stops41h 35m

Chiang Mai

Sun 30/11

18:50-18:15

1 stop30h 25m

£531

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 4/11

20:55-06:05

1 stop26h 10m

Chiang Mai

Thu 4/12

08:50-18:10

1 stop16h 20m

£534

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 31/10

22:00-17:50

1 stop36h 50m

Chiang Mai

Mon 1/12

18:50-18:15

1 stop30h 25m

£548

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 31/10

22:00-17:50

1 stop36h 50m

Chiang Mai

Sun 30/11

18:50-18:15

1 stop30h 25m

£548

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Fri 31/10

22:00-17:50

1 stop36h 50m

Chiang Mai

Wed 3/12

18:50-18:15

1 stop30h 25m

£548

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Wed 5/11

08:55-06:05

1 stop14h 10m

Chiang Mai

Sat 29/11

08:50-18:10

1 stop16h 20m

£553

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Tue 4/11

19:20-06:05

1 stop27h 45m

Chiang Mai

Sat 29/11

08:50-14:30

1 stop36h 40m

£553

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Thu 6/11

20:55-06:05

1 stop26h 10m

Chiang Mai

Sat 29/11

08:50-06:40

1 stop28h 50m

£554

LondonChiang Mai

LHR - CNX

LHRCNX

London Heathrow

Mon 3/11

21:00-15:25

2 stops35h 25m

Chiang Mai

Mon 15/12

15:35-17:30

1 stop32h 55m

£559

Flights are sorted by cheapest return flights first.

Deals found on 14/8

Showing 1-10 of 18 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 8 August 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 5 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £776). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,357). 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 15 August 2025.

It’s typically best to fly out from London Heathrow Airport to Chiang Mai at midday. Doing so could potentially save you 27% on the flight price compared to flying in the morning, which is usually more expensive.

What’s the top stopover airport for flights from London Heathrow Airport to Chiang Mai?

Share of one-stop return flights from London Heathrow Airport to Chiang Mai chosen by Cheapflights users in the past 12 months, using the same stopover each way.

Bangkok (BKK) – chosen by Cheapflights users on 67% of one-stop itineraries from London Heathrow Airport to Chiang Mai on Cheapflights.

What’s the cheapest stopover airport for flights from London Heathrow Airport to Chiang Mai?

Average return fare for one-stop flights from London Heathrow Airport to Chiang Mai, chosen by Cheapflights users in the past 12 months, with the same stopover each way.

Guangzhou (CAN) is the most affordable one-stop option, with an average return flight price of £508.

What’s the fastest stopover option from London Heathrow Airport to Chiang Mai?

Shortest average travel time for one-stop one-way flights from London Heathrow Airport to Chiang Mai, based on itineraries clicked by Cheapflights users over the past 12 months, grouped by stopover airport.

Flights via Bangkok (BKK) have the shortest average one-way travel time for one-stop routes: 15h 31m.

Which airport typically offers the quickest stopover for flights from London Heathrow Airport to Chiang Mai?

Average stopover duration for one-stop one-way flights from London Heathrow Airport to Chiang Mai, chosen by Cheapflights users in the last 12 months, grouped by stopover airport.

Flights via Abu Dhabi (AUH) offer the fastest connection on this route, with an average stopover time of 2h 29m.

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 15 August 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.
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
EVA Air
8.4
Very Good
1,233 reviews
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Thai Airways
7.8
Good
343 reviews
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Etihad Airways
7.4
Good
1,232 reviews
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Malaysia Airlines
7.4
Good
273 reviews
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount
Air China
7.3
Good
94 reviews
EVA Air
8.4
Very Good
1,233 reviews
Check prices

Boarding

8.4

Overall

8.4

Entertainment

8.0

Comfort

8.3

Crew

8.6

Food

8.1

Reviews

1 / 20
10.0
Excellent

Dale,May 2025

TPE - SFO

Flight staff were very courteous and efficient. Aircraft (seats, lavatories, etc) kept clean and replenished. Food service was timed perfectly and was delicious and had right amount

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.

  • 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 £416. Additional return tickets that might be worth considering are offered by China Eastern and Air China, with the lowest prices starting at £451 and £460, respectively. Users have found that China Southern is 46% cheaper than the other options available to this destination.

  • 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, April is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Mai (average of £776). Flying from London Heathrow Airport to Chiang Mai in July is currently the most expensive (average of £1,357). 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

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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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Heathrow to Chiang Rai flights
London City to Don Mueang Intl flights
Stansted to Trat flights
Gatwick to Trat flights
Southend to Krabi 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 15 August 2025.
AirlineCheapestAverageFlexibilityOn-time
China SouthernCheapest£416Average£463FlexibilityNo cancel feeOn-time69%
Search China Southern flights
China EasternCheapest£451Average£543FlexibilityNo cancel feeOn-time62%
Search China Eastern flights
Air ChinaCheapest£460Average£546FlexibilityNo cancel feeOn-time67%
Search Air China flights
Malaysia AirlinesCheapest£548Average£765FlexibilityNo cancel feeOn-time67%
Search Malaysia Airlines flights
Etihad AirwaysCheapest£606Average£686FlexibilityNo cancel feeOn-time75%
Search Etihad Airways flights
EVA AirCheapest£670Average£746FlexibilityNo cancel feeOn-time74%
Search EVA Air flights
Cathay PacificCheapest£674Average£888FlexibilityNo cancel feeOn-time72%
Search Cathay Pacific flights
Thai AirwaysCheapest£691Average£830FlexibilityNo 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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