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$ 1,116 Cheap Flights from St. Louis to London, Ontario (STL-YXU) in 2025

1 adult

Save money when you book flights with momondo

Big names, great deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Early arrival? Instantly customize your results

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from St. Louis to London (STL-YXU)

Round-trip

One-way

Cheap round-trip flights

7:04 p.m. - 3:17 p.m.STL-YXU

19h 13m2 stops

6:10 a.m. - 11:53 p.m.YXU-STL

18h 43m2 stops

C$ 1,116United Airlines

Find Deal

Wed, 17 Sep - Wed, 24 Sep

7:04 p.m. - 3:17 p.m.STL-YXU

19h 13m2 stops

6:10 a.m. - 12:44 p.m.YXU-STL

31h 34m2 stops

C$ 1,149United Airlines

Find Deal

Fri, 19 Sep - Fri, 26 Sep

5:15 a.m. - 9:27 p.m.STL-YXU

15h 12m2 stops

5:45 a.m. - 3:49 p.m.YXU-STL

11h 04m2 stops

C$ 1,172United Airlines

Find Deal

Fri, 24 Oct - Wed, 29 Oct

7:04 p.m. - 3:17 p.m.STL-YXU

19h 13m2 stops

6:10 a.m. - 3:44 p.m.YXU-STL

34h 34m3 stops

C$ 1,175United Airlines

Find Deal

Wed, 17 Sep - Wed, 24 Sep

7:04 p.m. - 3:17 p.m.STL-YXU

19h 13m2 stops

6:10 a.m. - 3:44 p.m.YXU-STL

34h 34m3 stops

C$ 1,200United Airlines

Find Deal

Fri, 19 Sep - Fri, 26 Sep

9:15 a.m. - 3:17 p.m.STL-YXU

5h 02m1 stop

6:10 a.m. - 11:53 p.m.YXU-STL

18h 43m2 stops

C$ 1,256United Airlines

Find Deal

Wed, 17 Sep - Wed, 24 Sep

9:15 a.m. - 3:17 p.m.STL-YXU

5h 02m1 stop

10:00 a.m. - 3:18 p.m.YXU-STL

6h 18m1 stop

C$ 1,269Air Canada

Find Deal

Wed, 17 Sep - Wed, 24 Sep

4:05 p.m. - 9:27 p.m.STL-YXU

4h 22m1 stop

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

7h 04m1 stop

C$ 1,298Air Canada

Find Deal

Fri, 24 Oct - Wed, 29 Oct

5:15 a.m. - 9:27 p.m.STL-YXU

15h 12m2 stops

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

7h 04m1 stop

C$ 1,303

Find Deal

Fri, 24 Oct - Wed, 29 Oct

9:15 a.m. - 3:17 p.m.STL-YXU

5h 02m1 stop

3:50 p.m. - 7:38 p.m.YXU-STL

4h 48m1 stop

C$ 1,328Air Canada

Find Deal

Fri, 19 Sep - Fri, 26 Sep

United Airlines flights from St. Louis to London, Ontario

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

United Airlines

17 Sep

STL7:04 p.m.Lambert-St Louis

19h 13m

2 stops

YXU3:17 p.m.London

24 Sep

YXU6:10 a.m.London

18h 43m

2 stops

STL11:53 p.m.Lambert-St Louis

C$ 1,116

Find similar

United Airlines

19 Sep

STL7:04 p.m.Lambert-St Louis

19h 13m

2 stops

YXU3:17 p.m.London

26 Sep

YXU6:10 a.m.London

31h 34m

2 stops

STL12:44 p.m.Lambert-St Louis

C$ 1,149

Find similar

United Airlines

24 Oct

STL5:15 a.m.Lambert-St Louis

15h 12m

2 stops

YXU9:27 p.m.London

29 Oct

YXU5:45 a.m.London

11h 04m

2 stops

STL3:49 p.m.Lambert-St Louis

C$ 1,172

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

17 Sep

STL9:15 a.m.Lambert-St Louis

5h 02m

1 stop

YXU3:17 p.m.London

24 Sep

YXU10:00 a.m.London

6h 18m

1 stop

STL3:18 p.m.Lambert-St Louis

C$ 1,269

Find similar

Air Canada

24 Oct

STL4:05 p.m.Lambert-St Louis

4h 22m

1 stop

YXU9:27 p.m.London

29 Oct

YXU9:25 a.m.London

7h 04m

1 stop

STL3:29 p.m.Lambert-St Louis

C$ 1,298

Find similar

Air Canada

19 Sep

STL9:15 a.m.Lambert-St Louis

5h 02m

1 stop

YXU3:17 p.m.London

26 Sep

YXU3:50 p.m.London

4h 48m

1 stop

STL7:38 p.m.Lambert-St Louis

C$ 1,328

Find similar

Fly from

Fly to

Route

Depart

Return

Price

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 17/9

7:04 p.m.-3:17 p.m.

2 stops19h 13m

London

Wed 24/9

6:10 a.m.-11:53 p.m.

2 stops18h 43m

C$ 1,116

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 19/9

7:04 p.m.-3:17 p.m.

2 stops19h 13m

London

Fri 26/9

6:10 a.m.-12:44 p.m.

2 stops31h 34m

C$ 1,149

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 24/10

5:15 a.m.-9:27 p.m.

2 stops15h 12m

London

Wed 29/10

5:45 a.m.-3:49 p.m.

2 stops11h 04m

C$ 1,172

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 17/9

7:04 p.m.-3:17 p.m.

2 stops19h 13m

London

Wed 24/9

6:10 a.m.-3:44 p.m.

3 stops34h 34m

C$ 1,175

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 19/9

7:04 p.m.-3:17 p.m.

2 stops19h 13m

London

Fri 26/9

6:10 a.m.-3:44 p.m.

3 stops34h 34m

C$ 1,200

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 17/9

9:15 a.m.-3:17 p.m.

1 stop5h 02m

London

Wed 24/9

6:10 a.m.-11:53 p.m.

2 stops18h 43m

C$ 1,256

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Wed 17/9

9:15 a.m.-3:17 p.m.

1 stop5h 02m

London

Wed 24/9

10:00 a.m.-3:18 p.m.

1 stop6h 18m

C$ 1,269

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 24/10

4:05 p.m.-9:27 p.m.

1 stop4h 22m

London

Wed 29/10

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

1 stop7h 04m

C$ 1,298

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 24/10

5:15 a.m.-9:27 p.m.

2 stops15h 12m

London

Wed 29/10

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

1 stop7h 04m

C$ 1,303

St. LouisLondon

STL - YXU

STLYXU

Lambert-St Louis

Fri 19/9

9:15 a.m.-3:17 p.m.

1 stop5h 02m

London

Fri 26/9

3:50 p.m.-7:38 p.m.

1 stop4h 48m

C$ 1,328

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

Best price found	C$ 1,116
Fastest flight time	4h 22m
Direct flights	None
Airports in London, Ontario	1 airport

The best flight deal from St. Louis to London, Ontario found on momondo in the last 72 hours is C$ 1,116

The fastest flight from St. Louis to London, Ontario takes 4h 22m

There are no direct flights from St. Louis to London, Ontario. Popular non-direct route for this connection is Lambert-St Louis Airport - London Airport.

There is 1 airport near London, Ontario: London (YXU)

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 22m.
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.