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

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Looking for a cheap flight? 25% of our users found flights 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 56m, 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 ($524)
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, Wednesday is the cheapest day to fly on average and Monday is the most expensive. Flying from Ontario back to London, the best deals are generally found on Monday, with Tuesday being the most expensive.

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

Airports
Origin
London
$524
only
$524
$529
only
$529
Destination
Ontario
$524
only
$524
Wed, Mar 7
LHR
ONT
17h 53m
Wed, Mar 21
ONT
LHR
19h 15m
Trip: 14 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

SEA
LHR
Excellent 8.0

Quality of food

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

Fri, Feb 23
LGW
ONT
31h 53m
Sun, Feb 25
ONT
LGW
34h 25m
Trip: 3 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

SEA
LHR
Excellent 8.0

Quality of food

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

Fri, Feb 23
LHR
ONT
16h 00m
Mon, Feb 26
ONT
LHR
14h 35m
Trip: 4 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

Tue, Feb 27
LGW
ONT
35h 04m
Wed, Mar 7
ONT
LGW
24h 40m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

Wed, Jan 31
LHR
ONT
15h 56m
Thu, Feb 8
ONT
LHR
14h 35m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

SEA
LHR
Excellent 8.0

Quality of food

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

Mon, Feb 5
LHR
ONT
17h 58m
Thu, Feb 22
ONT
LHR
13h 00m
Trip: 18 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

Mon, Feb 12
LHR
ONT
15h 56m
Thu, Feb 22
ONT
LHR
18h 15m
Trip: 11 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

Tue, Feb 13
LHR
ONT
17h 58m
Thu, Feb 22
ONT
LHR
14h 35m
Trip: 10 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

Wed, Feb 14
LHR
ONT
17h 58m
Thu, Feb 22
ONT
LHR
17h 25m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

Wed, Mar 7
LHR
ONT
16h 00m
Wed, Mar 21
ONT
LHR
21h 55m
Trip: 14 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
SEA
LHR
Excellent 8.0

Quality of food

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

Wed, Feb 7
LHR
ONT
15h 56m
Wed, Feb 28
ONT
LHR
19h 25m
Trip: 22 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

SEA
LHR
Excellent 8.0

Quality of food

Mon, Feb 5
LHR
ONT
15h 56m
Thu, Feb 15
ONT
LHR
18h 15m
Trip: 11 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

Tue, Feb 6
LHR
ONT
17h 58m
Thu, Feb 15
ONT
LHR
14h 45m
Trip: 10 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

Wed, Feb 7
LHR
ONT
15h 56m
Thu, Feb 15
ONT
LHR
17h 25m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

SEA
LHR
Excellent 8.0

Quality of food

IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

Mon, Feb 19
LHR
ONT
21h 14m
Tue, Feb 27
ONT
LHR
18h 15m
Trip: 9 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

Tue, Feb 20
LHR
ONT
21h 14m
Tue, Feb 27
ONT
LHR
14h 35m
Trip: 8 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

IAD
LHR
Good 6.0

General sense of management and professionalism, punctuality.

Lack of attention to detail and general frugality

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

LHR
JFK
Excellent 8.0

Flight wasn’t full so it was great to be able to stretch out!

One older cabin female attendant was quite arrogant - otherwise all good!

Wed, Feb 21
LHR
ONT
18h 03m
Tue, Feb 27
ONT
LHR
14h 45m
Trip: 7 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

Mon, Mar 5
LHR
ONT
16h 00m
Tue, Mar 13
ONT
LHR
20h 25m
Trip: 8 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

PHL
BWI
Excellent 8.5

Very rapid flight. Landed far before scheduled arrival(at least 25 minutes). Checked baggage was delivered before schedule arrival time. Crew was pleasant/helpful.

Flight was changed from what was originally scheduled and purchased. I was informed of the change after the purchase before traveling. Thus I had 4 1/2 hours between flights.

Tue, Mar 6
LHR
ONT
17h 53m
Tue, Mar 13
ONT
LHR
18h 25m
Trip: 7 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
DFW
Excellent 10.0

I arrived safely and on time.....good movie selection

Breakfast out of London was not appealing - eggs not tasty and potatoes mushy and lacking in taste.

LHR
JFK
Mediocre 3.6

Nothing about wheelchairs

When arrived they don't take wheelchairs

ORD
LHR
Excellent 9.3

the first flight from Chicago to London was great. very good aircraft.

SEA
LHR
Excellent 8.0

Quality of food

LHR
ORD
Good 6.6

Flight on time, friendly crew.

Not so good meals. For a 9 long-haul flight only one meal provided, other was a cheap candy bar. Other carriers do offer breakfast. Traveled with child and did not allow priority boarding at LHR. Limited leg room, I assume this already a trend well known by travelers.

Wed, Mar 7
LHR
ONT
16h 00m
Tue, Mar 13
ONT
LHR
19h 15m
Trip: 6 days
7.3GoodShow reviews
Overall 7.3 Good
Based on 14905 reviews
Overall
7.4
Boarding
7.6
Comfort
7.2
Crew
8.0
Entertainment
7.0
Food
6.9
LHR
NBO
Okay 5.0

Boarding, friendly people in London and Hamburg

Flight attendants, plane, food

LHR
TLV
Okay 5.6

the staff

aircraft, food, entertainment

AUH
LHR
Excellent 10.0

I arrived safely and on time

Audio plug for my seat was broken, but I slept so it worked out Kay.

LHR
FCO
Excellent 10.0

Friendly crew. Good day in the skies.

SEA
LHR
Excellent 8.0

Quality of food

London to Ontario Flight Information

Flights Arrive in Ontario
Flights Depart from London
Flight Price $524
Distance 5420 miles
Airlines British Airways
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

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At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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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.