Find Cheap Flights from London to Ontario (LON - ONT)

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When looking for a cheap flight, consider that 25% of our users selected a flight on this route for $657 or less.

FAQs for Booking London to Ontario Flights

How long does a flight from London to Ontario take?
An average nonstop flight takes 15h 54m, covering a distance of 5420 miles.
Which airlines provide the cheapest flights from London to Ontario?
In the past 3 days, the cheapest round-trip tickets were found on British Airways ($880), KLM ($1037) and Virgin Atlantic ($1126).
Do I need a passport to fly between London and Ontario?
Yes.
What’s the cheapest day of the week to fly London to Ontario?
For London to Ontario, Tuesday is the cheapest day to fly on average and Friday is the most expensive. Flying from Ontario back to London, the best deals are generally found on Monday, with Saturday being the most expensive.

Book cheap flights from London to Ontario (round-trip)

Airports
Origin
London
$880
only
$880
Destination
Ontario
$880
only
$880
Tue, Dec 26
LHR
ONT
21h 29m
Thu, Jan 25
ONT
LHR
15h 40m
Trip: 31 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
BOS
Okay 5.6

Were very nice and accomodating

Entertainment only worked sporadiaclly, crew tried toreaet it numerous times

LHR
DEN
Excellent 10.0

plane was not full so plenty of room to move around etc

ORD
LHR
Good 6.6

Excellent vegan meal selection!

No Wifi, average movie selection, cramped space, 2+ hour delay (half of which was spent sitting on plane).

VIE
LHR
Excellent 8.0

punctuality

trapped on this plane for over 3 hours and they can't even spring for a lousy soda and bag of crisps.

Fri, Feb 2
LHR
ONT
19h 23m
Mon, Feb 5
ONT
LHR
16h 25m
$1037
Trip: 4 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
AMS
ATL
Good 7.0

newer plane, good staff

need better and more food options, more often

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

DMM
AMS
Okay 4.0

OLD OLD plane with hard seats and tiny screens

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

Tue, Apr 17
LHR
ONT
21h 16m
Tue, May 1
ONT
LHR
20h 00m
$1126
Trip: 15 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 920 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
LAX
SYD
Excellent 10.0

Met expectations.

Things out of your control - time !!

SYD
LAX
Excellent 9.0

After 14 hours the seats were like sitting on spikes

LHR
JNB
Mediocre 2.0

We were told over the phone that we could bring our kayaks with us to Africa but the airport staff denied not only our kayaks, but also our paddles which were in a standard ski bag. Their excuse was that both the kayaks and paddle bags were 2 inches too long. .. TWO INCHES!!!!!! We had record of the person we talked to and the time and date, but none of that seemed to matter. It caused A HUGE INCONVENIENCE for us since we are in Zambia for 6 weeks without our gear to paddle one of the most challenging rivers in the world... the Zambezi. Now we are constantly trying to acquire the proper equipment with very little success. We run a nonprofit called the Montana Kayak Academy which provides free whitewater instruction to youth between 8 &18 yrs old and we will be sure to tell everyone we know to NOT TRAVEL WITH EITHER VIRGIN ATLANTIC OR BRITISH AIRWAYS.... EVER!!! VERY DISAPPOINTED! !!!!!!!!!!!!!!!!!

LAX
LHR
Mediocre 2.0

No one would update that the flight was delayed. They would not even communicate as to why delayed and would not put us in a different flight. Absolutely no customer service. Disappointed and would not fly jet airways again . I missed my conference lecture today as I was late.

No communication, nor will they tell you why it's late . Nor will they move you to another flight even wen requested

LHR
LAX
Excellent 9.6

The crew was friendly and professional, the food was good and offered frequently due to the long flight time (10.5 hours). The plane was comfortable even though nearly full. Overall, it was a good experience and I would definitely fly with Virgin Atlantic again.

Thu, Dec 14
LHR
ONT
17h 33m
Wed, Dec 20
ONT
LHR
21h 45m
$1248
Trip: 7 days
Overall 0.0 Poor
Based on 0 reviews
Mon, Dec 4
LHR
ONT
16h 05m
Tue, Dec 12
ONT
LHR
18h 15m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
VIE
LHR
Excellent 8.0

punctuality

trapped on this plane for over 3 hours and they can't even spring for a lousy soda and bag of crisps.

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

LHR
BOS
Okay 5.6

Were very nice and accomodating

Entertainment only worked sporadiaclly, crew tried toreaet it numerous times

ORD
LHR
Good 6.6

Excellent vegan meal selection!

No Wifi, average movie selection, cramped space, 2+ hour delay (half of which was spent sitting on plane).

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

Tue, Dec 5
LHR
ONT
16h 05m
Tue, Dec 12
ONT
LHR
19h 25m
Trip: 8 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

LHR
BOS
Okay 5.6

Were very nice and accomodating

Entertainment only worked sporadiaclly, crew tried toreaet it numerous times

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

LAS
LHR
Excellent 8.0

The flight was great. Business class is the way to go if it’s in your budget. However, the British Airways photos of business class does not quite reflect reality. It’s just a regular seat with more leg room.

LHR
BUD
Mediocre 2.6

Only card why?? No free food??

Sat, Feb 3
LHR
ONT
22h 31m
Mon, Feb 5
ONT
LHR
16h 25m
$1037
Trip: 3 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
DMM
AMS
Okay 4.0

OLD OLD plane with hard seats and tiny screens

AMS
SFO
Excellent 10.0

Loved the service...everything was excellent

The bus class seat was a bit narrow at the feet

FCO
AMS
Excellent 10.0

Flight crew was pleasant and attentive. Seats were comfortable for economy as well. We were allowed to check in extra baggage for free at check in which really helped since we would be catching a connecting flight in Amsterdam

ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

Wed, Dec 6
LHR
ONT
16h 05m
Tue, Dec 12
ONT
LHR
22h 55m
Trip: 7 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
DEN
Excellent 10.0

Everything

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

VIE
LHR
Excellent 8.0

punctuality

trapped on this plane for over 3 hours and they can't even spring for a lousy soda and bag of crisps.

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

Tue, May 29
LHR
ONT
21h 16m
Mon, Jun 11
ONT
LHR
20h 00m
$1250
Trip: 14 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 920 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
SFO
LHR
Good 7.6

food was good, and tvs in the seats.

wifi didnt work, was the whole reason i took this airline. most international flights are cold it was very hot

LAX
LHR
Mediocre 2.0

No one would update that the flight was delayed. They would not even communicate as to why delayed and would not put us in a different flight. Absolutely no customer service. Disappointed and would not fly jet airways again . I missed my conference lecture today as I was late.

No communication, nor will they tell you why it's late . Nor will they move you to another flight even wen requested

LHR
SFO
Good 6.0

Service is super fast

SYD
LAX
Excellent 9.0

After 14 hours the seats were like sitting on spikes

LHR
LAX
Excellent 9.6

The crew was friendly and professional, the food was good and offered frequently due to the long flight time (10.5 hours). The plane was comfortable even though nearly full. Overall, it was a good experience and I would definitely fly with Virgin Atlantic again.

Mon, Dec 4
LHR
ONT
16h 05m
Sun, Dec 10
ONT
LHR
20h 55m
Trip: 7 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
BOS
LHR
Excellent 8.0

The food on the flight was good and the wheelchair assistance was good too.

LHR
BUD
Mediocre 2.6

Only card why?? No free food??

LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
DEN
Excellent 10.0

plane was not full so plenty of room to move around etc

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

Sat, Dec 23
LHR
ONT
26h 53m
Sat, Dec 30
ONT
LHR
17h 25m
$1358
Trip: 8 days
Overall 0.0 Poor
Based on 0 reviews
Tue, Dec 5
LHR
ONT
16h 05m
Sun, Dec 10
ONT
LHR
17h 25m
Trip: 6 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
HYD
Excellent 8.0

The food on the flight was good.

The wheelchair assistance was very bad as no one turned up with a wheelchair. The airways really need to improve their service and make sure that whey they offering wheelchair assistance they in fact do it. This has happened serveral times that no one turned up at the London airport.

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
BUD
Mediocre 2.6

Only card why?? No free food??

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

Tue, May 8
LHR
ONT
19h 13m
Mon, May 28
ONT
LHR
15h 29m
$1338
Trip: 21 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

FCO
AMS
Excellent 10.0

Flight crew was pleasant and attentive. Seats were comfortable for economy as well. We were allowed to check in extra baggage for free at check in which really helped since we would be catching a connecting flight in Amsterdam

AMS
ATL
Good 7.0

newer plane, good staff

need better and more food options, more often

AMS
IAH
Good 7.3

Per usual, KLM can't seem to figure out the order of boarding the plane. Should be business - priority - everyone else. Instead they do priority first, and that's usually two-thirds of the passengers. Strange choice of in-flight movies; no accounting for taste, I guess.

Fri, Apr 6
LHR
ONT
21h 16m
Fri, Apr 27
ONT
LHR
15h 40m
$1376
Trip: 22 days
8.1ExcellentShow reviews
Overall 8.1 Excellent
Based on 920 reviews
Overall
8.1
Boarding
8.3
Comfort
7.8
Crew
8.5
Entertainment
8.0
Food
7.8
JFK
LHR
Good 6.3

Crew was professional.

Couldn't stretch my right (window side) leg. Display quality was poor.

LHR
JNB
Mediocre 2.0

We were told over the phone that we could bring our kayaks with us to Africa but the airport staff denied not only our kayaks, but also our paddles which were in a standard ski bag. Their excuse was that both the kayaks and paddle bags were 2 inches too long. .. TWO INCHES!!!!!! We had record of the person we talked to and the time and date, but none of that seemed to matter. It caused A HUGE INCONVENIENCE for us since we are in Zambia for 6 weeks without our gear to paddle one of the most challenging rivers in the world... the Zambezi. Now we are constantly trying to acquire the proper equipment with very little success. We run a nonprofit called the Montana Kayak Academy which provides free whitewater instruction to youth between 8 &18 yrs old and we will be sure to tell everyone we know to NOT TRAVEL WITH EITHER VIRGIN ATLANTIC OR BRITISH AIRWAYS.... EVER!!! VERY DISAPPOINTED! !!!!!!!!!!!!!!!!!

LAX
LHR
Mediocre 2.0

No one would update that the flight was delayed. They would not even communicate as to why delayed and would not put us in a different flight. Absolutely no customer service. Disappointed and would not fly jet airways again . I missed my conference lecture today as I was late.

No communication, nor will they tell you why it's late . Nor will they move you to another flight even wen requested

LHR
SFO
Good 6.0

Service is super fast

SEA
LHR
Excellent 8.6

Reasonably comfortable for a long jet ride. Helpful and considerate flight attendants.

The strange windows that kept it looking like night out until 30 minutes before we landed. I prefer the natural light to help readjust my time zones.

Wed, Dec 6
LHR
ONT
16h 05m
Sun, Dec 10
ONT
LHR
22h 55m
Trip: 5 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

BOS
LHR
Excellent 8.0

The food on the flight was good and the wheelchair assistance was good too.

LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
DEN
Excellent 10.0

Everything

Wed, May 9
LHR
ONT
18h 56m
Mon, May 28
ONT
LHR
15h 29m
$1338
Trip: 20 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

AMS
ATL
Good 7.0

newer plane, good staff

need better and more food options, more often

DMM
AMS
Okay 4.0

OLD OLD plane with hard seats and tiny screens

Fri, Dec 1
LHR
ONT
15h 54m
Fri, Dec 8
ONT
LHR
17h 25m
Trip: 8 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LAS
LHR
Excellent 8.0

The flight was great. Business class is the way to go if it’s in your budget. However, the British Airways photos of business class does not quite reflect reality. It’s just a regular seat with more leg room.

BOS
LHR
Excellent 8.0

The food on the flight was good and the wheelchair assistance was good too.

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

LHR
BUD
Mediocre 2.6

Only card why?? No free food??

Mon, May 14
LHR
ONT
18h 56m
Mon, May 28
ONT
LHR
15h 29m
$1338
Trip: 15 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

DMM
AMS
Okay 4.3

staff was fine

old old plane, very uncomfortable. Tiny bad screen made movies pointless

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

AMS
ATL
Good 7.0

newer plane, good staff

need better and more food options, more often

Thu, Dec 7
LHR
ONT
16h 05m
Sun, Dec 10
ONT
LHR
14h 45m
Trip: 4 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 13331 reviews
Overall
7.5
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
BLQ
Good 7.6

I didn't like the fact that one has to pay for any refreshments on the flight, even for coffee, juice, or soda. When I asked for water, the flight attendant assumed that I wanted to pay for bottled water; I had to specify that I wanted regular water.

DEN
LHR
Good 6.3

food was good

IFE was not good the equipment is very old and selection is limited

BOS
LHR
Excellent 8.0

The food on the flight was good and the wheelchair assistance was good too.

CPT
LHR
Good 6.6

Your staff were truly excellent, helpful and engaging.

My TV worked only intermittently and I therefore could not relax and enjoy the entertainment...

LAS
LHR
Excellent 8.0

The flight was great. Business class is the way to go if it’s in your budget. However, the British Airways photos of business class does not quite reflect reality. It’s just a regular seat with more leg room.

Mon, May 21
LHR
ONT
18h 56m
Mon, Jun 4
ONT
LHR
21h 55m
$1340
Trip: 15 days
7.8GoodShow reviews
Overall 7.8 Good
Based on 1468 reviews
Overall
8.0
Boarding
7.9
Comfort
7.7
Crew
8.4
Entertainment
7.1
Food
7.5
DMM
AMS
Okay 4.3

staff was fine

old old plane, very uncomfortable. Tiny bad screen made movies pointless

ATL
CLE
Okay 4.6

old plane, tight and uncomfortable

ATL
CLE
Okay 4.0

OLD plane without comfort or entertainment

LHR
AMS
Good 7.6

I was pleasantly surprised they had a snack service on such a short flight. The flight attendants were very friendly

Amsterdam customs is the most disorganized I have ever seen. With the number of tourists entering the country you would think they would have done something about it. There were only 2 customs agents!! One for all passports and 1 for all passports. We were in the customs hall longer than we were in flight!

JNB
AMS
Excellent 9.6

Comfort economy well worth the extra.

*
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The fares displayed include all taxes and fees for economy class travel and were found by the provider in the last 72 hours. Seats are limited and may not be available on all flights and days. Fares are subject to change and may not be available on all flights or dates of travel. Some carriers charge additional fees for extra checked bags. Please check the carriers' sites.