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Cheap flights from London Heathrow Airport to Southeast Asia from $370

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from London Heathrow Airport to Southeast Asia departing on 3/1. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from London Heathrow Airport to Southeast Asia

Cheap round-trip flights

Air China Logo
8:25 pm - 12:00 pmLHR-HAN
32h 35m1 stop
Air China Logo
1:20 pm - 3:55 pmHAN-LHR
33h 35m1 stop
$552Air China
Find Deal
Mon, Dec 1 - Sat, Dec 13
Shenzhen Airlines Logo
10:05 pm - 2:05 pmLHR-HAN
34h 00m1 stop
Shenzhen Airlines Logo
3:05 pm - 8:00 pmHAN-LHR
34h 55m1 stop
$556Shenzhen Airlines
Find Deal
Wed, Oct 1 - Thu, Oct 9
China Southern Logo
10:00 pm - 2:30 pmLHR-BKK
33h 30m1 stop
China Southern Logo
8:20 am - 6:35 pmBKK-LHR
17h 15m1 stop
$593China Southern
Find Deal
Fri, Nov 28 - Fri, Dec 26
China Southern Logo
10:10 pm - 4:45 pmLHR-MNL
35h 35m1 stop
China Southern Logo
5:45 pm - 7:00 pmMNL-LHR
32h 15m1 stop
$613China Southern
Find Deal
Fri, Sep 26 - Sun, Oct 5
Etihad Airways Logo
8:55 pm - 9:40 amLHR-SIN
29h 45m1 stop
Etihad Airways Logo
9:10 pm - 6:45 pmSIN-LHR
28h 35m1 stop
$665Etihad Airways
Find Deal
Thu, Oct 2 - Thu, Oct 9
Etihad Airways Logo
7:20 pm - 9:35 amLHR-SIN
30h 15m1 stop
Etihad Airways Logo
7:25 pm - 6:40 amSIN-LHR
19h 15m1 stop
$668Etihad Airways
Find Deal
Thu, Mar 12 - Thu, Mar 26
SAUDIA Logo
10:05 pm - 2:40 amLHR-CGK
21h 35m1 stop
SAUDIA Logo
12:40 am - 12:15 pmCGK-LHR
18h 35m1 stop
$753SAUDIA
Find Deal
Sat, Nov 1 - Wed, Nov 12
Qatar Airways Logo
6:55 pm - 1:50 pmLHR-SGN
36h 55m1 stop
Qatar Airways Logo
7:40 pm - 12:10 pmSGN-LHR
23h 30m1 stop
$757Qatar Airways
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Tue, Oct 14 - Mon, Oct 27
SAUDIA Logo
6:50 pm - 10:30 pmLHR-HKT
20h 40m1 stop
SAUDIA Logo
11:55 pm - 12:15 pmHKT-LHR
19h 20m1 stop
$764SAUDIA
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Sun, Nov 9 - Wed, Nov 19
Qatar Airways Logo
9:00 am - 7:50 amLHR-HKT
16h 50m1 stop
Qatar Airways Logo
8:30 am - 5:25 pmHKT-LHR
15h 55m1 stop
$783Qatar Airways
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Thu, Oct 9 - Wed, Nov 5

Hainan Airlines flights from London Heathrow Airport to Southeast Asia

Our best Hainan Airlines deals on London Heathrow Airport to Southeast Asia flight tickets
Hainan Airlines
Nov 17
LHR9:00 pmLondon Heathrow
30h 05m
2 stops
BKK10:05 amBangkok Suvarnabhumi
Dec 7
BKK1:35 amBangkok Suvarnabhumi
23h 20m
2 stops
LHR5:55 pmLondon Heathrow
$607
Find similar
Hainan Airlines
Jan 16
LHR9:00 pmLondon Heathrow
30h 05m
2 stops
BKK10:05 amBangkok Suvarnabhumi
Jan 29
BKK1:35 amBangkok Suvarnabhumi
23h 00m
2 stops
LHR5:35 pmLondon Heathrow
$647
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China Eastern flights from London Heathrow Airport to Southeast Asia

Our best China Eastern deals on London Heathrow Airport to Southeast Asia flight tickets
China Eastern
Nov 17
LHR9:00 pmLondon Heathrow
21h 10m
1 stop
SGN1:10 amHo Chi Minh City
Nov 30
SGN2:10 amHo Chi Minh City
22h 20m
1 stop
LHR5:30 pmLondon Heathrow
$601
Find similar
China Eastern
Nov 17
LHR9:00 pmLondon Heathrow
21h 10m
1 stop
SGN1:10 amHo Chi Minh City
Dec 1
SGN4:55 pmHo Chi Minh City
31h 35m
2 stops
LHR5:30 pmLondon Heathrow
$603
Find similar
China Eastern
Nov 17
LHR9:00 pmLondon Heathrow
36h 00m
2 stops
SGN4:00 pmHo Chi Minh City
Dec 1
SGN4:55 pmHo Chi Minh City
31h 35m
2 stops
LHR5:30 pmLondon Heathrow
$604
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from London Heathrow Airport to Southeast Asia 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, momondo users made 832,500 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from London Heathrow Airport to Southeast Asia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Mon 12/1

8:25 pm-12:00 pm

1 stop32h 35m

Hanoi Noibai

Sat 12/13

1:20 pm-3:55 pm

1 stop33h 35m

$552

LondonHanoi

LHR - HAN

LHRHAN

London Heathrow

Wed 10/1

10:05 pm-2:05 pm

1 stop34h 00m

Hanoi Noibai

Thu 10/9

3:05 pm-8:00 pm

1 stop34h 55m

$556

LondonBangkok

LHR - BKK

LHRBKK

London Heathrow

Fri 11/28

10:00 pm-2:30 pm

1 stop33h 30m

Bangkok Suvarnabhumi

Fri 12/26

8:20 am-6:35 pm

1 stop17h 15m

$593

LondonManila

LHR - MNL

LHRMNL

London Heathrow

Fri 9/26

10:10 pm-4:45 pm

1 stop35h 35m

Manila Ninoy Aquino Intl

Sun 10/5

5:45 pm-7:00 pm

1 stop32h 15m

$613

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 10/2

8:55 pm-9:40 am

1 stop29h 45m

Singapore Changi

Thu 10/9

9:10 pm-6:45 pm

1 stop28h 35m

$665

LondonSingapore

LHR - SIN

LHRSIN

London Heathrow

Thu 3/12

7:20 pm-9:35 am

1 stop30h 15m

Singapore Changi

Thu 3/26

7:25 pm-6:40 am

1 stop19h 15m

$668

LondonJakarta

LHR - CGK

LHRCGK

London Heathrow

Sat 11/1

10:05 pm-2:40 am

1 stop21h 35m

Jakarta Soekarno-Hatta Intl

Wed 11/12

12:40 am-12:15 pm

1 stop18h 35m

$753

LondonHo Chi Minh City

LHR - SGN

LHRSGN

London Heathrow

Tue 10/14

6:55 pm-1:50 pm

1 stop36h 55m

Ho Chi Minh City

Mon 10/27

7:40 pm-12:10 pm

1 stop23h 30m

$757

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Sun 11/9

6:50 pm-10:30 pm

1 stop20h 40m

Phuket City

Wed 11/19

11:55 pm-12:15 pm

1 stop19h 20m

$764

LondonPhuket City

LHR - HKT

LHRHKT

London Heathrow

Thu 10/9

9:00 am-7:50 am

1 stop16h 50m

Phuket City

Wed 11/5

8:30 am-5:25 pm

1 stop15h 55m

$783

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Southeast Asia from

How to get the cheapest flight ticket from London Heathrow Airport to Southeast Asia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Southeast Asia?

The month of May is, on average, the cheapest month to fly to Southeast Asia from London Heathrow Airport, with most prices found around $826. If you don’t want to visit Southeast Asia in May, then you should wait until June to fly from London Heathrow Airport, when ticket prices are also cheap, with an average price of $832.

What is the cheapest day to depart on your flight to Southeast Asia?

The cheapest day to depart from London Heathrow Airport to Southeast Asia is on a Wednesday when prices can be found for as low as $986. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $1,117. These prices are subject to change though, so be sure to set up a Price Alert for flights to Southeast Asia.

What is the cheapest time of day to depart on your flight to Southeast Asia?

In the afternoon is the cheapest time of day to fly from London Heathrow Airport to Southeast Asia when you can find flight prices for as low as $798. Flying to Southeast Asia in the afternoon is an ideal time because this is during off-peak travel hours. Try not to purchase tickets in the evening because they tend to be around $1,066. Of course, these prices can vary depending on the time of year and what airport you fly to.

What is the cheapest London Heathrow to Southeast Asia flight route?

Fly from London Heathrow to Singapore Changi for the best London Heathrow - Southeast Asia flight prices

How far in advance should I book a flight to Southeast Asia?

You are more likely to see cheaper flights to Southeast Asia from London Heathrow Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Southeast Asia for around $945 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Southeast Asia from London Heathrow Airport for as low as $870 on momondo.

What cabin class options are available on London Heathrow to Southeast Asia flights?

There are 4 cabin classes available to choose from on London Heathrow to Southeast Asia flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on London Heathrow Airport to Southeast Asia flights?

No. A direct flight is the cheapest option for a flight between London Heathrow Airport to Southeast Asia.

Cheap London Heathrow Airport to Southeast Asia flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from London Heathrow Airport to Southeast Asia

Fastest flight time

11h 20m

Direct flights

Mon, Tue, Thu and Sat

Airports in Southeast Asia

1 airport
The fastest flight from London Heathrow Airport to Southeast Asia takes 11h 20m
Direct flights go from London Heathrow Airport to Southeast Asia on Monday, Tuesday, Thursday and Saturday. There are no airlines offering direct flights.
There is 1 airport near Southeast Asia: Hanoi Noibai (HAN)
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  • When did momondo last update prices for flights from London Heathrow Airport to Southeast Asia?

    Prices for flights from London Heathrow Airport to Southeast Asia were last updated today.

  • How many operators does momondo search for flights from London Heathrow Airport to Southeast Asia?

  • How old do you have to be to fly from London Heathrow Airport to Southeast Asia?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from London Heathrow Airport to Southeast Asia.

  • What documentation or ID do you need to fly to Southeast Asia?

    The travel and health documents you'll need for your trip to Southeast Asia may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Southeast Asia. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from London Heathrow Airport to Southeast Asia?

Best airlines flying from London Heathrow Airport to Southeast Asia

Compare and see reviews for airlines that fly from London Heathrow Airport to Southeast Asia with momondo
Airline
Rating
Free Cancellation
Price
SAUDIAPriceFrom $407Free CancellationRating
7.4
634 reviews
Search SAUDIA flights
Shenzhen AirlinesPriceFrom $457Free CancellationRating
7.5
20 reviews
Search Shenzhen Airlines flights
China EasternPriceFrom $519Free CancellationRating
7.2
166 reviews
Search China Eastern flights
China SouthernPriceFrom $555Free CancellationRating
7.5
110 reviews
Search China Southern flights
Hainan AirlinesPriceFrom $560Free CancellationRating
8.2
45 reviews
Search Hainan Airlines flights
Air IndiaPriceFrom $590Free CancellationRating
5.5
2,930 reviews
Search Air India flights
British AirwaysPriceFrom $620Free CancellationRating
6.7
7,363 reviews
Search British Airways flights
Gulf AirPriceFrom $625Free CancellationRating
7.1
209 reviews
Search Gulf Air flights
Austrian AirlinesPriceFrom $641Free CancellationRating
7.6
850 reviews
Search Austrian Airlines flights
Oman AirPriceFrom $687Free CancellationRating
8.3
93 reviews
Search Oman Air flights

Why use momondo?

Why should I use momondo to find a flight deal from London to Southeast Asia?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from London to Southeast Asia for you.

Can I find flights from London to Southeast Asia with flexible booking policies on momondo?

All flight searches from London to Southeast Asia on momondo can be filtered to show those which offer flexible booking policies.

How can momondo help me find flights from London to Southeast Asia?

Once all potential London to Southeast Asia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from London to Southeast Asia right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Southeast Asia, momondo offers a useful price alert feature which will track prices for flights to Southeast Asia from London and alert you when they change.

An easier way to manage your Southeast Asia trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.
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