How do I get Price Alerts for flights from St. Louis to London, Ontario?

Price Alerts will notify you by email when the price for flights to London, Ontario from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.

How can I save money on flights from St. Louis to London, Ontario with momondo?

With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.

How does momondo find its flight prices?

momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

When did momondo last update prices for flights from Lambert-St Louis Airport to London Airport?

Prices for flights from Lambert-St Louis Airport to London Airport are updated daily.

How old do you have to be to fly from Lambert-St Louis Airport to London Airport?

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 Lambert-St Louis Airport to London Airport.

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

The necessary travel and health documents for your London 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.

C$ 1,324 Cheap Flights from St. Louis to London in 2026

1 adult

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Find the cheapest flights from St. Louis to London

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

8:30 a.m. - 9:21 p.m.

STL

YXU

11h 51m

2 stops

9:25 a.m. - 9:42 p.m.

YXU

STL

13h 17m

2 stops

C$ 1,324United Airlines

Wed, 4 Mar - Wed, 11 Mar

4:05 p.m. - 9:21 p.m.

STL

YXU

4h 16m

1 stop

9:25 a.m. - 3:29 p.m.

YXU

STL

7h 04m

1 stop

C$ 1,347Air Canada

Mon, 2 Mar - Wed, 4 Mar

9:55 a.m. - 9:21 p.m.

STL

YXU

10h 26m

2 stops

9:25 a.m. - 9:40 p.m.

YXU

STL

13h 15m

2 stops

C$ 1,351United Airlines

Mon, 2 Mar - Wed, 4 Mar

7:41 a.m. - 5:05 p.m.

STL

YXU

8h 24m

2 stops

9:25 a.m. - 3:29 p.m.

YXU

STL

7h 04m

1 stop

C$ 1,361Air Canada

Mon, 2 Mar - Wed, 4 Mar

4:05 p.m. - 9:21 p.m.

STL

YXU

4h 16m

1 stop

9:25 a.m. - 9:07 p.m.

YXU

STL

12h 42m

2 stops

C$ 2,078United Airlines

Tue, 3 Mar - Tue, 10 Mar

8:30 a.m. - 5:05 p.m.

STL

YXU

7h 35m

2 stops

9:25 a.m. - 4:23 p.m.

YXU

STL

7h 58m

2 stops

C$ 2,190United Airlines

Tue, 3 Mar - Tue, 10 Mar

Air Canada flights from St. Louis to London, Ontario

Our best Air Canada deals on St. Louis to London, Ontario flight tickets

Air Canada

2 Mar

STL4:05 p.m.Lambert-St Louis

4h 16m

1 stop

YXU9:21 p.m.London

4 Mar

YXU9:25 a.m.London

7h 04m

1 stop

STL3:29 p.m.Lambert-St Louis

C$ 1,347

Air Canada

2 Mar

STL7:41 a.m.Lambert-St Louis

8h 24m

2 stops

YXU5:05 p.m.London

4 Mar

YXU9:25 a.m.London

7h 04m

1 stop

STL3:29 p.m.Lambert-St Louis

C$ 1,361

United Airlines flights from St. Louis to London, Ontario

Our best United Airlines deals on St. Louis to London, Ontario flight tickets

United Airlines

4 Mar

STL8:30 a.m.Lambert-St Louis

11h 51m

2 stops

YXU9:21 p.m.London

11 Mar

YXU9:25 a.m.London

13h 17m

2 stops

STL9:42 p.m.Lambert-St Louis

C$ 1,324

United Airlines

2 Mar

STL9:55 a.m.Lambert-St Louis

10h 26m

2 stops

YXU9:21 p.m.London

4 Mar

YXU9:25 a.m.London

13h 15m

2 stops

STL9:40 p.m.Lambert-St Louis

C$ 1,351

United Airlines

3 Mar

STL4:05 p.m.Lambert-St Louis

4h 16m

1 stop

YXU9:21 p.m.London

10 Mar

YXU9:25 a.m.London

12h 42m

2 stops

STL9:07 p.m.Lambert-St Louis

C$ 2,078

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 4/3

8:30 a.m.-9:21 p.m.

2 stops11h 51m

London

Wed 11/3

9:25 a.m.-9:42 p.m.

2 stops13h 17m

C$ 1,324

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Mon 2/3

4:05 p.m.-9:21 p.m.

1 stop4h 16m

London

Wed 4/3

9:25 a.m.-3:29 p.m.

1 stop7h 04m

C$ 1,347

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Mon 2/3

9:55 a.m.-9:21 p.m.

2 stops10h 26m

London

Wed 4/3

9:25 a.m.-9:40 p.m.

2 stops13h 15m

C$ 1,351

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Mon 2/3

7:41 a.m.-5:05 p.m.

2 stops8h 24m

London

Wed 4/3

9:25 a.m.-3:29 p.m.

1 stop7h 04m

C$ 1,361

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Tue 3/3

4:05 p.m.-9:21 p.m.

1 stop4h 16m

London

Tue 10/3

9:25 a.m.-9:07 p.m.

2 stops12h 42m

C$ 2,078

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Tue 3/3

8:30 a.m.-5:05 p.m.

2 stops7h 35m

London

Tue 10/3

9:25 a.m.-4:23 p.m.

2 stops7h 58m

C$ 2,190

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

When to book flights from St. Louis to London, Ontario

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to London, Ontario according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap St. Louis to London, Ontario (STL to YXU) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to London, Ontario

Fastest flight time	11h 51m
Direct flights	None

The fastest flight from St. Louis to London, Ontario takes 11h 51m

There are no direct flights from St. Louis to London, Ontario. There are no popular flight routes from St. Louis to London, Ontario.

Search flight deals

How far is Lambert-St Louis to London by plane?
London is 895.2 km away from Lambert-St Louis. In terms of flight time, this usually takes a little over 11h 51m.
When did momondo last update prices for flights from Lambert-St Louis Airport to London Airport?
Prices for flights from Lambert-St Louis Airport to London Airport are updated daily.
How old do you have to be to fly from Lambert-St Louis Airport to London Airport?
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 Lambert-St Louis Airport to London Airport.
What documentation or ID do you need to fly to London Airport?
The necessary travel and health documents for your London 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.

How do I get Price Alerts for flights from St. Louis to London, Ontario?
Price Alerts will notify you by email when the price for flights to London, Ontario from St. Louis decreases. To activate this, select your desired travel dates and search for offers. While browsing through offers you’ll see the Price Alert widget toggle. Click it to turn on notifications.
How can I save money on flights from St. Louis to London, Ontario with momondo?
With “Price Forecast”, learn how soon you should book your flight in advance. Down to the day of week and time of day, our information can inform you on the ideal time to book to save on your travel. Our “Price Calendar” shows you at a quick glance when to book your travel for lower rates. By setting “Price Alerts” you can monitor changes in price and target the ideal time to book. Search for your trip destination by budget amount via our “Explore” feature. Whether you’re looking for ideas for your next travel adventure or cost-cutting tips, our “Discover” content is a great place to start.
How does momondo find its flight prices?
momondo shows deals across 700+ competitors all at once. momondo is active in 30 international markets, so you can have access to a wide range of options from airlines and OTAs alike.

Grand Bend

Port Stanley

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to London?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to London. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to London with flexible booking policies on momondo?

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

How can momondo help me find flights from St. Louis to London?

Once all potential St. Louis to London 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 St. Louis to London right now. Can momondo alert me if prices change?

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