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Cheap flights from London Heathrow Airport to Chiang Rai from £638

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 10/3. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — CEI
5 Apr — 12 Apr1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Heathrow to Chiang Rai

Enter your travel dates to find the best prices.

Cheapest flights from Heathrow to Chiang Rai
Explore the most affordable flight options available from Heathrow to Chiang Rai. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 6 March 2026.

Sun 3/513:40
LHR
-
CEI
2 stops22h 40m
Multiple Airlines
Thu 11/610:10
CEI
-
LHR
2 stops26h 25m
Multiple Airlines
Deal found 3/3£710
Fri 13/321:00
LHR
-
CEI
3 stops51h 55m
Multiple Airlines
Wed 29/408:35
CEI
-
LHR
1 stop16h 40m
Multiple Airlines
Deal found 3/3£785
Sun 3/511:20
LHR
-
CEI
1 stop25h 25m
Singapore Airlines
Thu 11/615:45
CEI
-
LHR
1 stop20h 10m
Singapore Airlines
Deal found 4/3£864

Find flight deals from Heathrow to Chiang Rai

Discover tips and strategies to find the most affordable flight options for your journey from Heathrow (LHR) to Chiang Rai (CEI). 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 6 March 2026.

Round-trip from

£652

One-way from

£638

Popular in

October

Cheapest in

September

Average price

£800
14/4-21/4
  • 14/4-21/4
  • 5 total stops
  • 58h 20m total
  • London to Chiang Rai
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10/3
  • 10/3
  • 2 total stops
  • 19h 50m total
  • London to Chiang Rai
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£4 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (£20 potential savings vs. average return price).
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Average for round-trip flights in March 2026
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Cheapflights Fare Finder

 
Customise your flight search to find flights from Heathrow to Chiang Rai 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 6 March 2026.
Use the filters below to find and compare flights from London Heathrow Airport to Chiang Rai that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Sun 3/5

13:40-18:20

2 stops22h 40m

Chiang Rai

Thu 11/6

10:10-06:35

2 stops26h 25m

£710
Fastest return journey

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Mon 20/7

21:25-18:20

1 stop14h 55m

Chiang Rai

Wed 29/7

18:55-07:15

1 stop18h 20m

£904

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Fri 20/3

21:20-09:40

1 stop29h 20m

Chiang Rai

Mon 27/4

18:55-19:20

1 stop30h 25m

£1,069

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Mon 20/7

13:40-18:20

2 stops22h 40m

Chiang Rai

Wed 29/7

13:40-06:30

2 stops22h 50m

£1,101

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Fri 20/3

11:50-18:20

1 stop23h 30m

Chiang Rai

Mon 27/4

13:40-07:15

1 stop23h 35m

£1,111

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Thu 26/3

06:35-09:40

2 stops20h 05m

Chiang Rai

Fri 27/3

18:55-17:25

2 stops29h 30m

£1,313

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Thu 14/5

22:05-18:35

1 stop38h 30m

Chiang Rai

Mon 18/5

19:30-19:30

1 stop30h 00m

£1,380
Cheapest one-way
Fastest single journey

LondonChiang Rai

LHR - CEI

LHRCEI

London Heathrow

Tue 10/3

15:30-18:20

2 stops19h 50m

£638

Flights are sorted by cheapest return flights first.

Deals found on 5/3

Sorted by cheapest first

Best time to book a flight from Heathrow to Chiang Rai

Have a flexible travel schedule? Discover the best time to fly to Chiang Rai 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 Rai

What is the cheapest month to book a flight from London Heathrow Airport to Chiang Rai?

Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Rai (average of £390). Flying from London Heathrow Airport to Chiang Rai in July is currently the most expensive (average of £646). 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.

Reviews of airlines servicing Chiang Rai

Get insights into the airlines that provide service to Chiang Rai. 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 Rai. Reviews last updated 6 March 2026.
Check out reviews from past customers who have flown with Thai Airways from London Heathrow Airport to Chiang Rai to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Thai Airways
7.8
Good
391 reviews
Check prices

Entertainment

6.9

Boarding

7.9

Comfort

7.6

Crew

8.4

Food

7.4

Overall

7.8

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
391 reviews
Thai Airways
7.8
Good
391 reviews
Check prices

Entertainment

6.9

Boarding

7.9

Comfort

7.6

Crew

8.4

Food

7.4

Overall

7.8

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 Rai. 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 Rai from London Heathrow?

    Chiang Rai (CEI), located 4.5 mi from the city center, is the airport you fly into when you book flights from London Heathrow to Chiang Rai. 1 airline have flights to Chiang Rai from London Heathrow on a regular basis. Booking flights from London Heathrow to Chiang Rai should not be difficult; the airport handles an average of 0 inbound flights from London Heathrow per day.

  • What is the cheapest airline to fly from London Heathrow Airport to Chiang Rai round-trip?

    Currently priced at £755, Thai Airways will fly you from London Heathrow Airport to Chiang Rai and back. In addition to Thai Airways, many other airlines offer competitively priced options for your trip. Users have found that Thai Airways is 10% cheaper than the other options available to this destination.

  • Can I find deals for flights from Heathrow to Chiang Rai that include hotel bookings?

    Yes. In addition to deals on Heathrow to Chiang Rai flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Heathrow to Chiang Rai?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Heathrow to Chiang Rai.

  • Can I find deals for business class flights from Heathrow to Chiang Rai?

    Yes. Cheapflights offers flight deals from Heathrow to Chiang Rai 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 Rai?

    Currently, March is the cheapest month in which you can book a flight from London Heathrow Airport to Chiang Rai (average of £390). Flying from London Heathrow Airport to Chiang Rai in July is currently the most expensive (average of £646). 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 airline flying from Heathrow to Chiang Rai

Discover the top airline that operate flights from Heathrow to Chiang Rai. 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 6 March 2026.
AirlineCheapestAverageFlexibilityOn-time
Thai AirwaysCheapest£755Average£822FlexibilityNo cancel feeOn-time77%
Search Thai Airways flights

Fly with Cheapflights

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How does Cheapflights help users find flights from Heathrow to Chiang Rai?

Cheapflights goes through 900+ travel sites to look for the best flight deals for flights from Heathrow to Chiang Rai. Too many options? Cheapflights also provides filters for things like airlines, price ranges, and number of stops to help you make a decision easily.

Why should you use Cheapflights to find cheap flight tickets from Heathrow to Chiang Rai?

Millions of users choose and trust Cheapflights to book the best flight deals from Heathrow to Chiang Rai for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Heathrow to Chiang Rai with no change fees?

Certainly. Search results for flights to Chiang Rai from Heathrow shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Heathrow to Chiang Rai become cheaper?

Yes! Start tracking prices for Heathrow to Chiang Rai flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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