$320 Find Cheap Flights from Ontario to the United Kingdom

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to the United Kingdom departing on 7/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Cheap Flights from Ontario to the United Kingdom

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
London
London1 stop$896
Edinburgh
Edinburgh1 stop$866
Manchester
Manchester2 stops$893
Birmingham
Birmingham2 stops$1,005
Belfast
Belfast2 stops$1,046
Leeds
Leeds2 stops$1,275
London
London1 stop$896
Edinburgh
Edinburgh1 stop$866
Manchester
Manchester2 stops$893
Birmingham
Birmingham2 stops$1,005
Belfast
Belfast2 stops$1,046
Leeds
Leeds2 stops$1,275

Book Cheap Ontario to the United Kingdom Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to the United Kingdom that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to the United Kingdom

Wed, Aug 19 - Wed, Aug 26
United Airlines Logo
7:00 am - 8:25 am
ONT
-
EDI
17h 25m
1 stop
United Airlines Logo
9:00 am - 8:04 pm
EDI
-
ONT
43h 04m
2 stops
$866United Airlines
Wed, Aug 19 - Wed, Aug 26
Air Canada Logo
5:00 am - 7:40 am
ONT
-
EDI
18h 40m
2 stops
Air Canada Logo
9:00 am - 8:52 pm
EDI
-
ONT
43h 52m
2 stops
$870Air Canada
Wed, Oct 21 - Wed, Oct 28
American Airlines Logo
4:59 pm - 6:35 pm
ONT
-
EDI
17h 36m
2 stops
American Airlines Logo
11:25 am - 11:06 pm
EDI
-
ONT
18h 41m
2 stops
$874American Airlines
Sun, Aug 23 - Tue, Sep 8
KLM Logo
2:00 pm - 3:35 pm
ONT
-
LHR
17h 35m
1 stop
KLM Logo
6:30 am - 4:14 pm
LHR
-
ONT
17h 44m
2 stops
$896KLM
Mon, Sep 14 - Tue, Sep 22
British Airways Logo
2:22 pm - 5:35 pm
ONT
-
EDI
19h 13m
2 stops
British Airways Logo
5:50 am - 6:57 pm
EDI
-
ONT
21h 07m
2 stops
$899British Airways
Sat, Sep 5 - Tue, Sep 15
Delta Logo
5:55 pm - 12:10 pm
ONT
-
LHR
34h 15m
1 stop
Delta Logo
6:30 am - 4:14 pm
LHR
-
ONT
17h 44m
2 stops
$902Delta
Tue, Aug 4 - Tue, Sep 8
British Airways Logo
12:39 pm - 4:10 pm
ONT
-
NCL
19h 31m
2 stops
British Airways Logo
8:40 pm - 6:57 pm
NCL
-
ONT
30h 17m
2 stops
$902British Airways
Mon, Aug 10 - Thu, Aug 20
Delta Logo
1:00 pm - 10:00 am
ONT
-
LHR
13h 00m
1 stop
Delta Logo
6:15 am - 4:14 pm
LHR
-
ONT
17h 59m
2 stops
$903Delta
Fri, May 8 - Fri, May 15
KLM Logo
1:29 pm - 4:50 pm
ONT
-
NCL
19h 21m
2 stops
KLM Logo
5:45 am - 6:36 pm
NCL
-
ONT
20h 51m
2 stops
$1,074KLM
Sat, May 9 - Sat, May 16
American Airlines Logo
9:33 am - 5:00 pm
ONT
-
NCL
23h 27m
2 stops
American Airlines Logo
9:15 am - 11:46 pm
NCL
-
ONT
22h 31m
2 stops
$1,113American Airlines
Booking Insights

KAYAK's insights & trends for Ontario to the United Kingdom flights

Get data-powered insights and trends into flights from Ontario to the United Kingdom to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Ontario to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to the United Kingdom, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to the United Kingdom is March, when tickets cost $576 (return) on average. On the other hand, the most expensive months are June and July, when the average cost of round-trip tickets is $1,304 and $1,212 respectively.

Good to know

Low seasonJanuary
Best time to beat the crowds but there is an average 10% increase in price.
Most popular time to fly and prices are also 24% lower on average.

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Ontario to the United Kingdom?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to the United Kingdom.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to the United Kingdom?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to the United Kingdom is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to the United Kingdom?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to the United Kingdom with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to the United Kingdom?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to the United Kingdom up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 5 airlines serving from Ontario to the United Kingdom

 
Need help choosing which airline to fly with from Ontario to the United Kingdom? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
DeltaOverall score based on 8444 reviews
7.8Entertainment
7.2Food
8.5Crew
8.1Boarding
7.9Comfort
Airline reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

10.0 ExcellentTeresa, Apr 2026
SMF - LAX
Read more Delta reviews

While they turned off most cabin lights to allow people to sleep, I was bothered by how bright the side lights still were. It was still quite bright for me in a window seat, when I wish I could have slept!

Generally on time departures and arrivals, clean planes, sky miles membership provides great benefits (complimentary upgrades, etc).

N Everything was perfect from boarding to assistance to baggage in Tampa

Loved the crew! Sucks that we went from 1 hour and 8 minute layover to a 3 hour layover. But weather sucks like that.

Fast, lovely scenery, great info on the Delta flight screen about landmarks we were flying over. Great landing!

Long flight but comfortable and not freezing as I have experienced on Hawaiian flights to the islands. They gave us blankets just in case. Nice touch.

I took seat 15A in anticipation of window seat, there is no window.

Flight late, the waited for a long time for “personal” to arrive at gate to dock the plane in Rochester. So annoying. This flight was expected, why aren’t personel available for the jet bridge?

My recent experience was excellent on Delta! I flew with Delta Comfort and I was really comfortable in my seat. I enjoyed the in-flight service. The flight attendants were so friendly and hospitable. I love the snack on the flight as well. This was my first time flying on Delta and I will definitely consider flying with them again.

My flight was canceled on Sunday. Rebooking took three hours. Had to pay for accommodations another night. New flight was delayed for 5 hours, all that was sent was a 12 dollar food voucher, which doesn’t tell you how to use it. Then when we landed we had to sit on the plane for an hour before we could get off.

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

There were no charge points for phones on the economy seats. The seats were comfortable overall. Food was okay.. flight was on time

It was really nice journey i personally recommend klm flight

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

Empty seats next to me - wish it had been for a longer flight!!

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

United Airline crews were very friendly and very attentive. 12 hours flight was gone like in a shorter one.

Food was surprisingly delicious. Space in the seat is horrible when the seating front is reclined. Movie offerings were terrible. Crew was friendly and helpful.

Flight itself excellent, but delayed so missed connection & got to destination 2 hrs later

Due to cancellation of connecting flight (Lufthansa) I didn’t fly with United

It was a red-eye, but the flight felt surprisingly quick. The seats were very comfortable, and that made resting much easier. I also want to thank the gentleman seated next to me, who graciously moved so my mom could sit beside me. We slept almost the entire way. The cabin crew was respectful in not disturbing us, while also being courteous and professional throughout. Thank you, United.

Boarding was again a "free for all". We were boarding group 4, and almost the entire plane was able to board before us. It's a shame that someone who follows the rules, gets the short end of the stick. Not fair.

It was perfect! I've never flown with United before, but I definitely will in the future

I had a cancelled flight because of technical issues going to my destination, and a delayed flight coming home. All told it wasn’t a total bust.

The business class seat is exceptional. I wish the food is more palatable.

the entire flight felt off. The crew seemed uninterested and disengaged. The food service was really bad - overcooked, bland, weird food service. They actually woke us up to serve chicken wraps in the middle of the night, after dinner and before breakfast. Made no sense. Ultimately, I was glad they did though, because the breakfast had been held for so long it was inedible. Eggs, potatoes, sausage - all disgusting. We were asked to "honor" the lavatories for premium customers and stay in our own cabin: this was also strange. So people in economy didn't pay enough to use the closest toilet to them??? It's a toilet. All in all, not the experience I have come to expect from United Airlines. The return flight from Paris to SFO was better, btw.

On time departure and early arrival. Flight attendant very nice.

The business class layout of chairs was weired. You are sitting directly across stranger.,

The SFO Lounge crew were amazing. The bartender Faris was great. Thanks!

Friendly crew is the only nice thing. Seats uncomfortable. Food and snacks horrible. Movies were the same as the first 10 hour flight two weeks before

Was not able to do a online check-in because the American Airlines system doesn't store our visa or other passport information, allowing us to have a trouble-free check-in. We were forced to have to check-in at the counter which Changes are upgrade status given that we were not able to check in much earlier.

Good flight, seated and had a water within 5 minutes. Crew was hospitable.

We left at 1030 am pacific from LA and supposed to land at 7 pm Eastern in NY. They made a detour, stopped in Philadelphia and didn’t land till 1130 PM Eastern!!! Worst flight experience with no pilot communication with no explanation as to what was going on. Everyone was very frustrated to say the least.

I cancelled my ticket less than 24 hours deadline but I didn’t get refunded.

Flight boarded from Gate 159B, the farthest gate in the LAX Bradley Terminal. While the flight operated on time, the first class cabin attendant made no recognition of my being an Advantage Executive Platinum member.

The flight itself was excellent but the gate attendant made me check my carryon since she said it was an inch too big. I’ve had no problems with this carryon on recent flights on Qantas, Delta, Austrian, Southwest Airlines even though the overhead bins are the same size. there were other carryons in the bins that also looked larger than mine and there was room left in the bins for more. When I picked up my carryon from baggage claim one of the wheels had broken off.

Flight delayed, connection was not at gate listed and so missed, staff were rude at Heathrow, phone tree stupid and difficult, took me 21 actual hours to reach my destination. Almost lost my hotel reservation after walking in a strange city alone after midnight because they would not put me up in a hotel at sfo or heathrow. I will never fly BA again and will tell all people and Instagram followers never to fly BA.

Check-in in SAN was long. ORD was good. Flight delayed On board crew was ok. No warmth or personality. LHrR barely made connection

Wish the food and overall service was better. They treat Business class passengers same as economy

They had us seating down for one hour just waiting on the plane

Flying with BA is always a good experience—even in economy class. It is better if in business and first class. Timely, breeze through security and timely connections

The issue was not with BA it was with the link yoiu sent fopr booking the flight

Loved the boarding option from Business class lounge, experience on flight was excellent, plenty of good food choices

Awful it always is unfortunately is the only way to fly direct to london

Check in was was and the agent was very friendly and helpful The lounge was nice...boarding was straight from the lounge Everything worked at our seats, and video entertainment was good ..food was mediocre

Airlines have to stop assuming passengers bring entertainment. Provide it like you used to in business class and above!! N

Everything you need to know for your flight from Ontario to the United Kingdom

Information on your arrival and departure airports