Which airline has the best punctuality record on Montreal to London flights?

According to our data, Thai Airways have had the least number of delays on this route over the last 12 months; with about 17% of their flights experiencing any sort of delay.

What airlines fly to London Heathrow Airport?

Air Canada, British Airways and Lufthansa are the top three most popular airlines that fly to London Heathrow Airport from Montreal Pierre Elliott Trudeau Intl Airport according to our data. Air Canada is the first choice among our users, with 49% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 4 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Montreal Pierre Elliott Trudeau Intl to London Heathrow?

WestJet, TAP AIR PORTUGAL, and Aer Lingus are the most popular carriers operating from Montreal Pierre Elliott Trudeau Intl to London Heathrow

How often are flights from Montreal to London delayed?

Historically, on average around 20% of flights between Montreal and London have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

What day of the week experiences the fewest flight delays on this route?

Sunday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

What is the most punctual flight time for Montreal to London flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What documentation or ID do you need to fly to London Heathrow Airport?

The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$296 Cheap Flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport in 2025/26

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9:45 pm - 10:40 pmYUL-LHR

19h 55m1 stop

6:00 am - 8:15 pmLHR-YUL

19h 15m1 stop

$554TAP AIR PORTUGAL

Find Deal

Mon, Dec 1 - Mon, Dec 15

9:45 pm - 5:30 pmYUL-LHR

14h 45m1 stop

8:15 am - 8:15 pmLHR-YUL

17h 00m1 stop

$555TAP AIR PORTUGAL

Find Deal

Sun, Nov 30 - Mon, Dec 15

9:45 pm - 10:40 pmYUL-LHR

19h 55m1 stop

6:30 pm - 8:15 pmLHR-YUL

30h 45m1 stop

$561TAP AIR PORTUGAL

Find Deal

Wed, Dec 3 - Sun, Dec 14

7:10 pm - 7:10 amYUL-LHR

7h 00mnonstop

7:40 am - 6:20 pmLHR-YUL

15h 40m1 stop

$588Lufthansa

Find Deal

Thu, Nov 27 - Sat, Dec 6

7:10 pm - 7:10 amYUL-LHR

7h 00mnonstop

9:00 am - 3:10 pmLHR-YUL

11h 10m1 stop

$592Air Canada

Find Deal

Thu, Feb 5 - Thu, Feb 12

3:35 pm - 9:20 amYUL-LHR

12h 45m1 stop

9:00 am - 3:10 pmLHR-YUL

11h 10m1 stop

$593Air Canada

Find Deal

Sun, Jan 18 - Thu, Feb 19

2:00 pm - 6:30 amYUL-LHR

11h 30m1 stop

8:45 am - 6:20 pmLHR-YUL

14h 35m1 stop

$594Lufthansa

Find Deal

Thu, Nov 27 - Sun, Dec 7

8:40 pm - 8:30 amYUL-LHR

6h 50mnonstop

4:10 pm - 6:45 pmLHR-YUL

7h 35mnonstop

$601British Airways

Find Deal

Mon, Dec 1 - Mon, Dec 8

8:40 pm - 8:30 amYUL-LHR

6h 50mnonstop

4:10 pm - 6:45 pmLHR-YUL

7h 35mnonstop

$605British Airways

Find Deal

Wed, Nov 26 - Sat, Dec 6

12:59 pm - 7:00 amYUL-LHR

13h 01m2 stops

4:10 pm - 6:45 pmLHR-YUL

7h 35mnonstop

$638American Airlines

Find Deal

Thu, Nov 13 - Wed, Nov 19

TAP AIR PORTUGAL flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Our best TAP AIR PORTUGAL deals on Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight tickets

TAP AIR PORTUGAL

Dec 1

YUL9:45 pmMontreal Pierre Elliott Trudeau Intl

19h 55m

1 stop

LHR10:40 pmLondon Heathrow

Dec 15

LHR6:00 amLondon Heathrow

19h 15m

1 stop

YUL8:15 pmMontreal Pierre Elliott Trudeau Intl

$554

Find similar

TAP AIR PORTUGAL

Nov 30

YUL9:45 pmMontreal Pierre Elliott Trudeau Intl

14h 45m

1 stop

LHR5:30 pmLondon Heathrow

Dec 15

LHR8:15 amLondon Heathrow

17h 00m

1 stop

YUL8:15 pmMontreal Pierre Elliott Trudeau Intl

$555

Find similar

TAP AIR PORTUGAL

Dec 3

YUL9:45 pmMontreal Pierre Elliott Trudeau Intl

19h 55m

1 stop

LHR10:40 pmLondon Heathrow

Dec 14

LHR6:30 pmLondon Heathrow

30h 45m

1 stop

YUL8:15 pmMontreal Pierre Elliott Trudeau Intl

$561

Find similar

Lufthansa flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Our best Lufthansa deals on Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight tickets

Lufthansa

Nov 27

YUL7:10 pmMontreal Pierre Elliott Trudeau Intl

7h 00m

LHR7:10 amLondon Heathrow

Dec 6

LHR7:40 amLondon Heathrow

15h 40m

1 stop

YUL6:20 pmMontreal Pierre Elliott Trudeau Intl

$588

Find similar

Lufthansa

Nov 27

YUL2:00 pmMontreal Pierre Elliott Trudeau Intl

11h 30m

1 stop

LHR6:30 amLondon Heathrow

Dec 7

LHR8:45 amLondon Heathrow

14h 35m

1 stop

YUL6:20 pmMontreal Pierre Elliott Trudeau Intl

$594

Find similar

Lufthansa

Feb 9

YUL7:10 pmMontreal Pierre Elliott Trudeau Intl

7h 00m

LHR7:10 amLondon Heathrow

Feb 16

LHR8:45 amLondon Heathrow

14h 35m

1 stop

YUL6:20 pmMontreal Pierre Elliott Trudeau Intl

$595

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport that are best for you.

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Route

Depart

Return

Price

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Mon 12/1

9:45 pm-10:40 pm

1 stop19h 55m

London Heathrow

Mon 12/15

6:00 am-8:15 pm

1 stop19h 15m

$554

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sun 11/30

9:45 pm-5:30 pm

1 stop14h 45m

London Heathrow

Mon 12/15

8:15 am-8:15 pm

1 stop17h 00m

$555

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Wed 12/3

9:45 pm-10:40 pm

1 stop19h 55m

London Heathrow

Sun 12/14

6:30 pm-8:15 pm

1 stop30h 45m

$561

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 11/27

7:10 pm-7:10 am

Nonstop7h 00m

London Heathrow

Sat 12/6

7:40 am-6:20 pm

1 stop15h 40m

$588

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 2/5

7:10 pm-7:10 am

Nonstop7h 00m

London Heathrow

Thu 2/12

9:00 am-3:10 pm

1 stop11h 10m

$592

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Sun 1/18

3:35 pm-9:20 am

1 stop12h 45m

London Heathrow

Thu 2/19

9:00 am-3:10 pm

1 stop11h 10m

$593

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 11/27

2:00 pm-6:30 am

1 stop11h 30m

London Heathrow

Sun 12/7

8:45 am-6:20 pm

1 stop14h 35m

$594

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Mon 12/1

8:40 pm-8:30 am

Nonstop6h 50m

London Heathrow

Mon 12/8

4:10 pm-6:45 pm

Nonstop7h 35m

$601

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Wed 11/26

8:40 pm-8:30 am

Nonstop6h 50m

London Heathrow

Sat 12/6

4:10 pm-6:45 pm

Nonstop7h 35m

$605

MontrealLondon

YUL - LHR

YULLHR

Montreal Pierre Elliott Trudeau Intl

Thu 11/13

12:59 pm-7:00 am

2 stops13h 01m

London Heathrow

Wed 11/19

4:10 pm-6:45 pm

Nonstop7h 35m

$638

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How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

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

Prices

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Other information

What is the cheapest month to fly to London Heathrow Airport?

The month of May is, on average, the cheapest month to fly to London Heathrow Airport from Montreal Pierre Elliott Trudeau Intl Airport, with most prices found around $659. If you’re not able to fly to London Heathrow Airport in May, then November is your next best option. Flight prices from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport during November average around $672.

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $802. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $919.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

According to our data, the cheapest time of day to fly to London Heathrow Airport is in the morning. momondo users have found flights departing from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport in the morning for as low as $668. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the evening are often more expensive with an average ticket price of $866.

What is the cheapest Montreal Pierre Elliott Trudeau Intl to London Heathrow flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to London Heathrow for the best Montreal Pierre Elliott Trudeau Intl - London Heathrow flight prices

How far in advance should I book a flight to London Heathrow Airport?

You are more likely to see cheaper flights to London Heathrow Airport from Montreal Pierre Elliott Trudeau Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to London Heathrow Airport for around $741 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to London Heathrow Airport from Montreal Pierre Elliott Trudeau Intl Airport for as low as $687 on momondo.

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to London Heathrow flights?

There are 3 cabin classes available to choose from on Montreal Pierre Elliott Trudeau Intl to London Heathrow 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 Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flights?

You could potentially save up to 45% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight.

How have Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight prices changed over time?

As of November 2025, prices for Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flights are approximately 1% more expensive when compared to flights at the same time last year.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport (YUL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Best Price Found	$694
Fastest flight time	6h 35m
Direct flights	Every day

The best one-way flight to London Heathrow Airport from Montreal Pierre Elliott Trudeau Intl Airport in the past 72 hours is $694. The best round-trip flight deal from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport found on momondo in the last 72 hours is $698.

The fastest flight from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport takes 6h 35m

Direct flights go from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport every day.

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How far is Montreal Pierre Elliott Trudeau Intl to London Heathrow by plane?
London Heathrow is 3238.7 mi away from Montreal Pierre Elliott Trudeau Intl. Flights usually cover this in 6h 40m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?
Prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport are refreshed on a daily basis.
How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?
There are 4 operators available for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport as of November 2025.
How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?
momondo data reveals that the most frequently booked plane model on the route from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport is Boeing 787-8 Dreamliner, representing 49.27% of all bookings. The subsequent popular models are Airbus A321neo at 21.24%, Boeing 787-9 Dreamliner at 7.72%, and Boeing 777-300ER at 5.79%.
What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?
momondo data reveals that the most frequently booked airline on the route from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport is Air Canada, representing 49% of all bookings. The subsequent popular airlines are British Airways at 22%, Lufthansa at 20%, and American Airlines at 9%.

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom $543	Free Cancellation	Rating 7.1 10,392 reviews	Search Air Canada flights
Lufthansa	PriceFrom $549	Free Cancellation	Rating 6.8 7,542 reviews	Search Lufthansa flights
American Airlines	PriceFrom $582	Free Cancellation	Rating 7.2 11,032 reviews	Search American Airlines flights
British Airways	PriceFrom $588	Free Cancellation	Rating 6.7 7,494 reviews	Search British Airways flights

American Airlines Flights From Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport
American Airlines flies from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport around 5 times per week, with 11,032 momondo users rating the airline 7.2/10. The cheapest American Airlines deal from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport in the last 72 hours was $582 (round-trip), much lower than the average airfare cost of $801 for American Airlines flights on this route.
Air Canada Flights From Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport
Air Canada (7.1/10 from 10,392 reviews) operates around 3 flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport in any given week. The average Air Canada airfare for this route is around $732, with deals from around $543 rare but found on momondo. Referenced prices are for round-trip Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight searches in the last 72 hours.

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

It is quick and easy to find Montreal to London flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to London that suits you.

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

Yes. momondo allows you to filter the results for Montreal to London flights to just show those with flexible booking policies.

How can momondo help me find flights from Montreal to London?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to London from Montreal.

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

Of course. momondo tracks the price of Montreal to London flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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Montreal Pierre Elliott Trudeau Intl Airport flight routes

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Cheap flights from Montreal Pierre Elliott Trudeau Intl Airport to London from $296

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TAP AIR PORTUGAL flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

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Lufthansa flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

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How to get the cheapest flight ticket from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

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 London Heathrow Airport?

What is the cheapest day to depart on your flight to London Heathrow Airport?

Our data shows that Sunday is the least expensive day to fly to London Heathrow Airport. Tickets to fly out on this day can be as low as $802. The most expensive day to fly to London Heathrow Airport is Friday, with ticket prices averaging around $919.

What is the cheapest time of day to depart on your flight to London Heathrow Airport?

What is the cheapest Montreal Pierre Elliott Trudeau Intl to London Heathrow flight route?

Fly from Montreal Pierre Elliott Trudeau Intl to London Heathrow for the best Montreal Pierre Elliott Trudeau Intl - London Heathrow flight prices

How far in advance should I book a flight to London Heathrow Airport?

What cabin class options are available on Montreal Pierre Elliott Trudeau Intl to London Heathrow flights?

There are 3 cabin classes available to choose from on Montreal Pierre Elliott Trudeau Intl to London Heathrow 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 Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flights?

You could potentially save up to 45% on your flight if you consider stops on a Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight.

How have Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flight prices changed over time?

As of November 2025, prices for Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport flights are approximately 1% more expensive when compared to flights at the same time last year.

What is the cheapest airline that flies from Montreal Pierre Elliott Trudeau Intl to London Heathrow?

WestJet, TAP AIR PORTUGAL, and Aer Lingus are the most popular carriers operating from Montreal Pierre Elliott Trudeau Intl to London Heathrow

What airlines fly to London Heathrow Airport?

How often are flights from Montreal to London delayed?

Historically, on average around 20% of flights between Montreal and London have experienced a delay on any given week. The average delay length over the past 12 months has been 168 minutes.

What is the most punctual flight time for Montreal to London flights?

Generally, flights departing in the morning tend to experience fewer delays. Flights in the evening have, in the past, seen delays more frequently in comparison.

What day of the week experiences the fewest flight delays on this route?

Sunday is statistically the day of the week which experiences the fewest number of delays on this flight route. Thursday has historically seen more delays on average compared to the rest of the week.

Which airline has the best punctuality record on Montreal to London flights?

According to our data, Thai Airways have had the least number of delays on this route over the last 12 months; with about 17% of their flights experiencing any sort of delay.

How many flights depart from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport on average per day?

9 flights are operational daily from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport as of November 2025. The most popular departure time for this route is 8:00PM, with 100% of flights per day taking off in the evening.

How many flights depart from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport on average per week?

As of November 2025, 67 flights take off from Montreal Pierre Elliott Trudeau Intl Airport and land in London Heathrow Airport each week. The most common flight departure day for this route is Sun, with 19% of weekly flights taking off on this day.

When to book flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Cheap Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport (YUL to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Best Price Found

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Direct flights

How far is Montreal Pierre Elliott Trudeau Intl to London Heathrow by plane?

When did momondo last update prices for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?

How many operators does momondo search for flights from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?

How old do you have to be to fly from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?

What documentation or ID do you need to fly to London Heathrow Airport?

What is the most popular plane model from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?

What is the most popular airline from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport?

Best airlines flying from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Compare and see reviews for airlines that fly from Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport with momondo

American Airlines Flights From Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Air Canada Flights From Montreal Pierre Elliott Trudeau Intl Airport to London Heathrow Airport

Traveling to a place near London?

Why use momondo?

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

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

How can momondo help me find flights from Montreal to London?

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

An easier way to manage your London Heathrow Airport 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.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular cities in the United Kingdom