Which layover airport offers the lowest fares from St. Louis to Montreal?

Flights via Toronto (YYZ) offer the lowest average round-trip price of $668.

Which airport is the most popular layover for flights between St. Louis and Montreal?

Toronto (YYZ) was the most common stop: 67% of momondo users choosing 1-stop flights on this route connected there.

Which layover airport has the shortest connection time from St. Louis to Montreal?

Detroit (DTW) has the shortest average layover time for this route: 1h 09m.

What is the cheapest airline that flies from Lambert-St Louis to Montreal?

American Airlines is the most popular carrier operating from Lambert-St Louis to Montreal

What airlines fly to Montreal?

Air Canada, United Airlines and Delta are the top three most popular airlines that fly to Montreal from St. Louis according to our data. Air Canada is the first choice among our users, with 57% of people opting to fly with this airline when traveling to Montreal. Keep in mind that there are 3 different airlines that fly to Montreal on a routine basis, so you have a few additional options to choose from.

Which layover airport has the shortest travel time from St. Louis to Montreal?

Flights connecting via Detroit (DTW) have the shortest average one-way travel time: 4h 27m.

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

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

How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?

As of October 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Montreal.

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

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Montreal.

What documentation or ID do you need to fly to Montreal?

The required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$180 Cheap Flights from St. Louis to Montreal in 2026/27

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Montreal

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One-way

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8:15 pm - 11:30 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

14h 15m1 stop Chicago O'Hare Intl

12:10 pm - 10:31 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 21m1 stop Chicago O'Hare Intl

$396American Airlines

Wed, Feb 3 - Sat, Feb 6

7:21 am - 9:31 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

13h 10m2 stops Chicago O'Hare Intl Philadelphia

12:10 pm - 10:31 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 21m1 stop Chicago O'Hare Intl

$405American Airlines

Wed, Feb 3 - Sat, Feb 6

7:21 am - 9:31 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

13h 10m2 stops Chicago O'Hare Intl Philadelphia

1:00 pm - 11:57 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 57m2 stops Philadelphia Chicago O'Hare Intl

$411American Airlines

Wed, Feb 3 - Sat, Feb 6

5:05 am - 7:07 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

13h 02m1 stop Chicago O'Hare Intl

9:25 am - 7:02 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

10h 37m1 stop Chicago O'Hare Intl

$652United Airlines

Wed, Dec 23 - Tue, Dec 29

7:18 am - 5:07 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

8h 49m1 stop Chicago O'Hare Intl

7:00 am - 11:05 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 05m1 stop Newark

$763United Airlines

Wed, Dec 23 - Sat, Dec 26

5:05 am - 5:50 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

11h 45m2 stops Chicago O'Hare Intl Washington, D.C. Reagan-National

7:00 am - 11:05 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

17h 05m1 stop Newark

$773United Airlines

Wed, Dec 23 - Sat, Dec 26

6:32 am - 6:54 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

11h 22m2 stops Detroit Metropolitan Wayne County New York LaGuardia

9:40 am - 8:32 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 52m2 stops New York LaGuardia Detroit Metropolitan Wayne County

$780Delta

Mon, Dec 7 - Wed, Dec 9

6:00 am - 6:50 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

11h 50m2 stops Atlanta Hartsfield-Jackson New York LaGuardia

9:28 am - 8:37 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

12h 09m2 stops New York LaGuardia Detroit Metropolitan Wayne County

$792Delta

Thu, Apr 8 - Tue, Apr 13

10:06 am - 11:33 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

12h 27m2 stops Atlanta Hartsfield-Jackson Detroit Metropolitan Wayne County

9:40 am - 8:32 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 52m2 stops New York LaGuardia Detroit Metropolitan Wayne County

$847Delta

Thu, Dec 10 - Mon, Dec 14

4:05 pm - 12:25 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

7h 20m1 stop Toronto Pearson Intl

11:10 am - 3:26 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

5h 16m1 stop Toronto Pearson Intl

$1,014Air Canada

Sat, Nov 21 - Mon, Nov 23

Cheap last minute flights

Enter your travel dates to find the best prices.

12:14 pm - 11:37 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

22h 23m2 stops Dallas/Fort Worth Orlando

8:00 pm - 5:42 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

22h 42m2 stops Orlando Atlanta Hartsfield-Jackson

$850Multiple Airlines

Mon, Nov 2 - Tue, Nov 10

7:59 pm - 11:51 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

26h 52m2 stops Denver Intl Orlando

1:10 pm - 5:42 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

29h 32m3 stops Toronto Pearson Intl Orlando Atlanta Hartsfield-Jackson

$869Multiple Airlines

Mon, Nov 2 - Tue, Nov 10

5:05 am - 11:25 amSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

5h 20m1 stop Chicago O'Hare Intl

4:06 pm - 8:26 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

5h 20m1 stop Philadelphia

$1,329American Airlines

Mon, Nov 2 - Tue, Nov 10

8:00 am - 3:16 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

6h 16m1 stop Washington, D.C. Dulles Intl

4:45 pm - 11:24 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

7h 39m1 stop Chicago O'Hare Intl

$1,355United Airlines

Fri, Oct 30 - Sat, Oct 31

8:00 am - 3:16 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

6h 16m1 stop Washington, D.C. Dulles Intl

10:55 am - 4:59 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

7h 04m2 stops New York LaGuardia Chicago O'Hare Intl

$1,360United Airlines

Fri, Oct 30 - Sat, Oct 31

10:53 am - 7:48 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

7h 55m2 stops Chicago O'Hare Intl Washington, D.C. Dulles Intl

10:55 am - 7:30 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

9h 35m2 stops New York LaGuardia Washington, D.C. Dulles Intl

$1,366United Airlines

Fri, Oct 30 - Sat, Oct 31

7:00 am - 1:37 pmSTL Lambert-St Louis-YUL Montreal Pierre Elliott Trudeau Intl

5h 37m1 stop New York LaGuardia

9:40 am - 8:29 pmYUL Montreal Pierre Elliott Trudeau Intl-STL Lambert-St Louis

11h 49m2 stops New York LaGuardia Detroit Metropolitan Wayne County

$1,414Delta

Mon, Nov 2 - Tue, Nov 10

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United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets

United Airlines

Dec 23

STL5:05 amLambert-St Louis

13h 02m

1 stop

YUL7:07 pmMontreal Pierre Elliott Trudeau Intl

Dec 29

YUL9:25 amMontreal Pierre Elliott Trudeau Intl

10h 37m

1 stop

STL7:02 pmLambert-St Louis

$652

United Airlines

Oct 30

STL8:00 amLambert-St Louis

6h 16m

1 stop

YUL3:16 pmMontreal Pierre Elliott Trudeau Intl

Oct 31

YUL4:45 pmMontreal Pierre Elliott Trudeau Intl

7h 39m

1 stop

STL11:24 pmLambert-St Louis

$1,355

United Airlines

Oct 30

STL8:00 amLambert-St Louis

6h 16m

1 stop

YUL3:16 pmMontreal Pierre Elliott Trudeau Intl

Oct 31

YUL10:55 amMontreal Pierre Elliott Trudeau Intl

7h 04m

2 stops

STL4:59 pmLambert-St Louis

$1,360

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

American Airlines

Feb 3

STL8:15 pmLambert-St Louis

14h 15m

1 stop

YUL11:30 amMontreal Pierre Elliott Trudeau Intl

Feb 6

YUL12:10 pmMontreal Pierre Elliott Trudeau Intl

11h 21m

1 stop

STL10:31 pmLambert-St Louis

$396

American Airlines

Feb 3

STL7:21 amLambert-St Louis

13h 10m

2 stops

YUL9:31 pmMontreal Pierre Elliott Trudeau Intl

Feb 6

YUL12:10 pmMontreal Pierre Elliott Trudeau Intl

11h 21m

1 stop

STL10:31 pmLambert-St Louis

$405

American Airlines

Feb 3

STL7:21 amLambert-St Louis

13h 10m

2 stops

YUL9:31 pmMontreal Pierre Elliott Trudeau Intl

Feb 6

YUL1:00 pmMontreal Pierre Elliott Trudeau Intl

11h 57m

2 stops

STL11:57 pmLambert-St Louis

$411

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 2/3

8:15 pm-11:30 am

1 stop14h 15m

Montreal Pierre Elliott Trudeau Intl

Sat 2/6

12:10 pm-10:31 pm

1 stop11h 21m

$396

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 2/3

7:21 am-9:31 pm

2 stops13h 10m

Montreal Pierre Elliott Trudeau Intl

Sat 2/6

12:10 pm-10:31 pm

1 stop11h 21m

$405

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 2/3

7:21 am-9:31 pm

2 stops13h 10m

Montreal Pierre Elliott Trudeau Intl

Sat 2/6

1:00 pm-11:57 pm

2 stops11h 57m

$411

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 12/23

5:05 am-7:07 pm

1 stop13h 02m

Montreal Pierre Elliott Trudeau Intl

Tue 12/29

9:25 am-7:02 pm

1 stop10h 37m

$652

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 12/23

7:18 am-5:07 pm

1 stop8h 49m

Montreal Pierre Elliott Trudeau Intl

Sat 12/26

7:00 am-11:05 pm

1 stop17h 05m

$763

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Wed 12/23

5:05 am-5:50 pm

2 stops11h 45m

Montreal Pierre Elliott Trudeau Intl

Sat 12/26

7:00 am-11:05 pm

1 stop17h 05m

$773

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Mon 12/7

6:32 am-6:54 pm

2 stops11h 22m

Montreal Pierre Elliott Trudeau Intl

Wed 12/9

9:40 am-8:32 pm

2 stops11h 52m

$780

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 4/8

6:00 am-6:50 pm

2 stops11h 50m

Montreal Pierre Elliott Trudeau Intl

Tue 4/13

9:28 am-8:37 pm

2 stops12h 09m

$792

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Thu 12/10

10:06 am-11:33 pm

2 stops12h 27m

Montreal Pierre Elliott Trudeau Intl

Mon 12/14

9:40 am-8:32 pm

2 stops11h 52m

$847

Quickest round-trip

St. LouisMontreal

STL Lambert-St Louis - YUL Montreal Pierre Elliott Trudeau Intl

STLYUL

Lambert-St Louis

Sat 11/21

4:05 pm-12:25 am

1 stop7h 20m

Montreal Pierre Elliott Trudeau Intl

Mon 11/23

11:10 am-3:26 pm

1 stop5h 16m

$1,014

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from St. Louis to Montreal

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

Airlines

Layovers

What is the cheapest month to fly to Montreal?

The cheapest month to fly to Montreal from St. Louis is in August. Flight prices, which tend to average around $457, are often lower during this time because this is during the off-season. If you are unable to visit Montreal during the month of August, then departing from St. Louis during the month February is also very affordable. Most momondo users find prices during this month for around $506.

What is the cheapest day to depart on your flight to Montreal?

The cheapest day to depart from St. Louis to Montreal is on a Tuesday when prices can be found for as low as $939. Flights from St. Louis to Montreal on a Friday will generally be more expensive and average around $1,232. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Montreal?

Our most recent data shows that the best time of day to fly to Montreal is in the morning. Flights from St. Louis to Montreal during this time can be as low as $994. At noon is when there is more demand to fly to Montreal, so prices are often more expensive at around $1,165 per ticket.

What is the cheapest Lambert-St Louis to Montreal flight route?

Fly from Lambert-St Louis to Montreal Pierre Elliott Trudeau Intl for the best Lambert-St Louis - Montreal flight prices

What cabin class options are available on St. Louis to Montreal flights?

There are 4 cabin classes available to choose from on St. Louis to Montreal 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 St. Louis to Montreal flights?

You could potentially save up to 17% on your flight if you consider stops on a St. Louis to Montreal flight.

When to book flights from St. Louis to Montreal

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

Estimated round-trip price

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

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

Best Price Found	$180
Fastest flight time	8h 00m
Direct flights	None

The best one-way flight to Montreal from St. Louis in the past 72 hours is $180. The best round-trip flight deal from St. Louis to Montreal found on momondo in the last 72 hours is $396.

The fastest flight from St. Louis to Montreal takes 8h 00m

There are no direct flights from St. Louis to Montreal. Popular non-direct route for this connection is Lambert-St Louis Airport - Montreal Pierre Elliott Trudeau Intl Airport.

Search flight deals

Frequently asked questions about flying from St. Louis to Montreal

How far is Lambert-St Louis to Montreal by plane?
The distance between Lambert-St Louis and Montreal is about 973.0 mi. A reasonable flight in good conditions will take 8h 00m.
When did momondo last update prices for flights from Lambert-St Louis Airport to Montreal?
Prices for flights from Lambert-St Louis Airport to Montreal are updated daily.
How many operators does momondo search for flights from Lambert-St Louis Airport to Montreal?
As of October 2026, there are 3 operators available to choose from for flights from Lambert-St Louis Airport to Montreal.
How old do you have to be to fly from Lambert-St Louis Airport to Montreal?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Lambert-St Louis Airport to Montreal.
What documentation or ID do you need to fly to Montreal?
The required travel and health documents for your Montreal trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Montreal. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from St. Louis to Montreal?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from St. Louis to Montreal is Canadair (Bombardier) Regional Jet 900 (54.90% of total bookings). The next most popular plane models are Boeing 787-8 Dreamliner (21.57%), Embraer 175 (11.76%), and Airbus A330-300 (5.88%).
What is the most popular airline from St. Louis to Montreal?
Based on momondo bookings for flights between St. Louis and Montreal, the leading airline is Air Canada, making up 70% of the total bookings. Other popular airlines include United Airlines with 15% and Delta with 14%.

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo

Airline	Rating	Free Cancellation	Price
Air Canada	PriceFrom $257	Free Cancellation	Rating 7.1 11,821 reviews	Search Air Canada flights
Delta	PriceFrom $288	Free Cancellation	Rating 7.8 8,681 reviews	Search Delta flights
United Airlines	PriceFrom $296	Free Cancellation	Rating 7.3 10,444 reviews	Search United Airlines flights

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from St. Louis to Montreal for you.

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

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

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

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

Yes. momondo can track prices for St. Louis to Montreal flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.

An easier way to manage your Montreal trip

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Complete your trip

Feeling lucky

Fly into one of these airports located in Montreal

MET - Montreal Metropolitan Airport

Montreal Pierre Elliott Trudeau Intl Airport

Cheap flights from St. Louis to Montreal from $180

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Montreal departing on 11/13. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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United Airlines flights from St. Louis to Montreal

Our best United Airlines deals on St. Louis to Montreal flight tickets

American Airlines flights from St. Louis to Montreal

Our best American Airlines deals on St. Louis to Montreal flight tickets

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See travel insights to Montreal from

How to get the cheapest flight ticket from St. Louis to Montreal

What is the cheapest month to fly to Montreal?

What is the cheapest day to depart on your flight to Montreal?

What is the cheapest time of day to depart on your flight to Montreal?

What is the cheapest Lambert-St Louis to Montreal flight route?

What cabin class options are available on St. Louis to Montreal flights?

Can stopping save me money on St. Louis to Montreal flights?

What is the cheapest airline that flies from Lambert-St Louis to Montreal?

What airlines fly to Montreal?

Which airport is the most popular layover for flights between St. Louis and Montreal?

Which layover airport offers the lowest fares from St. Louis to Montreal?

Which layover airport has the shortest travel time from St. Louis to Montreal?

Which layover airport has the shortest connection time from St. Louis to Montreal?

When to book flights from St. Louis to Montreal

Cheap St. Louis to Montreal (STL to YMQ) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from St. Louis to Montreal

Best airlines flying from St. Louis to Montreal

Compare and see reviews for airlines that fly from St. Louis to Montreal with momondo

Why use momondo?

An easier way to manage your Montreal 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 Canada

Fly into one of these airports located in Montreal

Airports listed have a maximum distance of 9.4 mi from Montreal

Fly your favorite airline to Montreal

Airlines are sorted and displayed according to clicks in the past 7 days on momondo

Cabin classes currently available on flights to Montreal

List of cabin classes available on flights landing in Montreal. Availability may vary depending on flight origin and airline.

Popular cities in Canada

Popular flights according to clicks in the last 7 days on momondo

Fly to other destinations from St. Louis

According to popular flight searches on momondo this year

Complete your trip to Montreal

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According to popular flight searches on momondo this year