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$ 1,113 Cheap Flights from St. Louis to London in 2025/26

1 adult

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Find the cheapest flights from St. Louis to London

Round-trip

One-way

Cheap round-trip flights

5:15 a.m. - 9:17 a.m.STL-YXU

27h 02m2 stops

5:40 p.m. - 3:47 p.m.YXU-STL

23h 07m2 stops

C$ 1,113United Airlines

Find Deal

seg, 20 out - seg, 27 out

5:15 a.m. - 9:17 a.m.STL-YXU

27h 02m2 stops

5:40 p.m. - 3:47 p.m.YXU-STL

23h 07m3 stops

C$ 1,171United Airlines

Find Deal

seg, 20 out - seg, 27 out

8:21 a.m. - 9:21 p.m.STL-YXU

12h 00m2 stops

9:25 a.m. - 9:00 p.m.YXU-STL

12h 35m2 stops

C$ 1,194United Airlines

Find Deal

ter, 3 mar - qua, 4 mar

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

4h 16m1 stop

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

7h 04m1 stop

C$ 1,282Air Canada

Find Deal

ter, 3 mar - qua, 4 mar

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

4h 16m1 stop

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

7h 04m1 stop

C$ 1,284Air Canada

Find Deal

ter, 4 nov - ter, 11 nov

10:00 a.m. - 9:21 p.m.STL-YXU

10h 21m2 stops

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

7h 04m1 stop

C$ 1,287United Airlines

Find Deal

ter, 4 nov - ter, 11 nov

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

4h 16m1 stop

9:25 a.m. - 10:00 p.m.YXU-STL

13h 35m2 stops

C$ 1,295United Airlines

Find Deal

ter, 3 mar - qua, 4 mar

5:24 p.m. - 9:21 p.m.STL-YXU

26h 57m2 stops

5:40 p.m. - 3:46 p.m.YXU-STL

23h 06m3 stops

C$ 1,310United Airlines

Find Deal

qui, 6 nov - qui, 13 nov

5:24 p.m. - 9:21 p.m.STL-YXU

26h 57m2 stops

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

7h 04m1 stop

C$ 1,324United Airlines

Find Deal

qui, 6 nov - qui, 13 nov

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

4h 16m1 stop

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

7h 04m1 stop

C$ 1,336Air Canada

Find Deal

qui, 6 nov - qui, 13 nov

United Airlines flights from St. Louis to London, Ontario

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

United Airlines

20 Oct

STL5:15 a.m.Lambert-St Louis

27h 02m

2 stops

YXU9:17 a.m.London

27 Oct

YXU5:40 p.m.London

23h 07m

2 stops

STL3:47 p.m.Lambert-St Louis

C$ 1,113

Find similar

United Airlines

20 Oct

STL5:15 a.m.Lambert-St Louis

27h 02m

2 stops

YXU9:17 a.m.London

27 Oct

YXU5:40 p.m.London

23h 07m

3 stops

STL3:47 p.m.Lambert-St Louis

C$ 1,171

Find similar

United Airlines

3 Mar

STL8:21 a.m.Lambert-St Louis

12h 00m

2 stops

YXU9:21 p.m.London

4 Mar

YXU9:25 a.m.London

12h 35m

2 stops

STL9:00 p.m.Lambert-St Louis

C$ 1,194

Find similar

Air Canada flights from St. Louis to London, Ontario

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

Air Canada

3 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$ 1,282

Find similar

Air Canada

4 Nov

STL4:05 p.m.Lambert-St Louis

4h 16m

1 stop

YXU9:21 p.m.London

11 Nov

YXU9:25 a.m.London

7h 04m

1 stop

STL3:29 p.m.Lambert-St Louis

C$ 1,284

Find similar

Air Canada

6 Nov

STL4:05 p.m.Lambert-St Louis

4h 16m

1 stop

YXU9:21 p.m.London

13 Nov

YXU9:25 a.m.London

7h 04m

1 stop

STL3:29 p.m.Lambert-St Louis

C$ 1,336

Find similar

momondo Fare Finder

Use the filters below to find and compare flights from St. Louis to London, Ontario that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

seg 20/10

5:15 a.m.-9:17 a.m.

2 stops27h 02m

London

seg 27/10

5:40 p.m.-3:47 p.m.

2 stops23h 07m

C$ 1,113

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

seg 20/10

5:15 a.m.-9:17 a.m.

2 stops27h 02m

London

seg 27/10

5:40 p.m.-3:47 p.m.

3 stops23h 07m

C$ 1,171

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

ter 3/3

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

2 stops12h 00m

London

qua 4/3

9:25 a.m.-9:00 p.m.

2 stops12h 35m

C$ 1,194

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

ter 3/3

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

1 stop4h 16m

London

qua 4/3

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

1 stop7h 04m

C$ 1,282

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

ter 4/11

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

1 stop4h 16m

London

ter 11/11

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

1 stop7h 04m

C$ 1,284

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

ter 4/11

10:00 a.m.-9:21 p.m.

2 stops10h 21m

London

ter 11/11

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

1 stop7h 04m

C$ 1,287

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

ter 3/3

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

1 stop4h 16m

London

qua 4/3

9:25 a.m.-10:00 p.m.

2 stops13h 35m

C$ 1,295

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

qui 6/11

5:24 p.m.-9:21 p.m.

2 stops26h 57m

London

qui 13/11

5:40 p.m.-3:46 p.m.

3 stops23h 06m

C$ 1,310

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

qui 6/11

5:24 p.m.-9:21 p.m.

2 stops26h 57m

London

qui 13/11

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

1 stop7h 04m

C$ 1,324

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

qui 6/11

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

1 stop4h 16m

London

qui 13/11

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

1 stop7h 04m

C$ 1,336

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

Direct flights	None

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 4h 16m.
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.

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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.