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Cheap flights from Montreal to Costa Mesa from C$ 271

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 6/5. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
3 May — 10 May1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in May or September, booked 56 days in advance, depart on a Thursday or Friday and return on a Tuesday

Cheap flight deals from Montreal to Costa Mesa

Enter your travel dates to find the best prices.

Cheapest flights from Montreal to Costa Mesa
Explore the most affordable flight options available from Montreal to Costa Mesa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 3 April 2026.

Wed 3/67:15 a.m.
YUL
-
LAX
2 stops11h 45m
WestJet
Wed 10/66:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 29/3C$ 433
Sun 10/57:15 a.m.
YUL
-
LAX
2 stops14h 15m
WestJet
Sat 16/56:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 29/3C$ 435
Sat 23/57:15 a.m.
YUL
-
LAX
1 stop9h 50m
WestJet
Sat 30/56:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 30/3C$ 438
Thu 23/45:55 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Fri 1/512:25 p.m.
LAX
-
YUL
Nonstop5h 21m
Air Canada
Deal found 29/3C$ 441
Wed 6/57:15 a.m.
YUL
-
LAX
2 stops11h 45m
WestJet
Wed 13/57:30 a.m.
LAX
-
YUL
2 stops13h 55m
WestJet
Deal found 29/3C$ 444
Fri 22/57:15 a.m.
YUL
-
LAX
2 stops11h 45m
WestJet
Mon 25/57:30 a.m.
LAX
-
YUL
2 stops13h 55m
WestJet
Deal found 30/3C$ 445
Fri 1/54:55 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Wed 6/510:30 p.m.
LAX
-
YUL
Nonstop5h 21m
Air Canada
Deal found 29/3C$ 447
Thu 7/57:15 a.m.
YUL
-
LAX
1 stop9h 50m
WestJet
Thu 14/57:30 a.m.
LAX
-
YUL
2 stops13h 55m
WestJet
Deal found 29/3C$ 449
Mon 20/46:45 a.m.
YUL
-
LAX
2 stops13h 13m
WestJet
Sat 2/56:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 29/3C$ 451

Find flight deals from Montreal to Costa Mesa

Keep the following information in mind while searching for Montreal to Costa Mesa flight deals. Data was last updated 3 April 2026.

Round-trip from

C$ 431

One-way from

C$ 271

Popular in

December

Cheapest in

May

Average price

C$ 502
WestJet
  • WestJet
  • 9/5-13/5
  • 2 total stops
  • 19h 50m total
  • Montreal to Costa Mesa
Search Deals
Porter Airlines
  • Porter Airlines
  • 6/5
  • 1 total stop
  • 8h 15m total
  • Montreal to Costa Mesa
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 92 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Montreal to Costa Mesa that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 3 April 2026.
Use the filters below to find and compare flights from Montreal to Costa Mesa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 17/4

2:20 p.m.-11:44 p.m.

1 stop12h 24m

Los Angeles Los Angeles

Sat 25/4

5:15 p.m.-10:40 a.m.

1 stop14h 25m

C$ 512

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 29/4

7:00 a.m.-1:34 p.m.

1 stop9h 34m

Los Angeles Los Angeles

Sat 2/5

11:20 p.m.-11:59 a.m.

1 stop9h 39m

C$ 512

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 25/4

6:00 a.m.-1:08 p.m.

1 stop10h 08m

Los Angeles Los Angeles

Sat 2/5

11:53 p.m.-10:40 a.m.

1 stop7h 47m

C$ 512

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 9/5

7:10 a.m.-3:00 p.m.

1 stop10h 50m

Los Angeles Los Angeles

Wed 13/5

9:30 a.m.-11:57 p.m.

1 stop11h 27m

C$ 512

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 20/4

7:00 a.m.-4:38 p.m.

1 stop12h 38m

Los Angeles Los Angeles

Wed 29/4

9:25 a.m.-11:51 p.m.

1 stop11h 26m

C$ 513

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 24/4

2:20 p.m.-11:44 p.m.

1 stop12h 24m

Los Angeles Los Angeles

Sat 2/5

11:53 p.m.-10:40 a.m.

1 stop7h 47m

C$ 513

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 18/4

7:00 a.m.-1:33 p.m.

1 stop9h 33m

Los Angeles Los Angeles

Sat 25/4

8:15 a.m.-11:51 p.m.

1 stop12h 36m

C$ 559

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 21/4

5:55 p.m.-8:59 p.m.

Nonstop6h 04m

Los Angeles Los Angeles

Sat 25/4

7:15 a.m.-8:15 p.m.

1 stop10h 00m

C$ 591
Quickest round-trip

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 14/4

5:55 p.m.-8:59 p.m.

Nonstop6h 04m

Los Angeles Los Angeles

Sat 18/4

7:00 a.m.-5:30 p.m.

1 stop7h 30m

C$ 598

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sun 17/5

7:00 a.m.-10:04 a.m.

Nonstop6h 04m

Los Angeles Los Angeles

Sun 24/5

10:35 p.m.-10:40 a.m.

1 stop9h 05m

C$ 598

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/3

Showing 1-10 of 22 resultsSorted by cheapest first
1
2
3

Best time to book a flight from Montreal to Costa Mesa

Have a flexible travel schedule? Discover the best time to fly to Costa Mesa from Montreal with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Montreal to Costa Mesa

How far ahead should I book a flight from Montreal to Costa Mesa?

Use this chart to determine the optimal time to book a round-trip flight from Montreal to Costa Mesa. Price data was last updated on 2 April 2026.

The best time to book flights from Montreal to Costa Mesa is 56 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Montreal to Costa Mesa?

Currently, April is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 186). Flying from Montreal to Costa Mesa in January is currently the most expensive (average of C$ 369). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YMQ to CM3?

Find hourly flight availability from Montreal to Costa Mesa. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 3 April 2026.

When flying from Montreal to Costa Mesa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Montreal to Costa Mesa

Explore weekly flight availability from Montreal to Costa Mesa. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 3 April 2026.

The most flights from YMQ to CM3 are scheduled on a Wednesday (4 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (3 on average).

How much does it cost to fly round-trip from Montreal to Costa Mesa?

Reviews of airlines servicing Costa Mesa

Get insights into the airlines that provide service to Costa Mesa. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Costa Mesa. Reviews last updated 3 April 2026.
Get a feel of what it's like to fly with Porter Airlines,United Airlines, andWestJet from Montreal to Costa Mesa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Porter Airlines
8.0
Very good
430 reviews
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
United Airlines
7.4
Good
9,542 reviews
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
WestJet
7.2
Good
3,311 reviews
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
American Airlines
7.1
Good
11,553 reviews
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.
Air Canada
7.1
Good
10,890 reviews
Porter Airlines
8.0
Very good
430 reviews
Check prices

Boarding

8.2

Overall

8.0

Food

7.6

Entertainment

7.0

Comfort

8.0

Crew

8.6

Reviews

1 / 20
10.0
Excellent

John,Mar 2026

YYZ - PVR

I'm 6ft 4in. The seats don't have enough room. But was a good flight.

Related info for your journey

Find useful and relevant information for your journey from Montreal to Costa Mesa. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Montreal to Costa Mesa?

    United Airlines and Delta can get you from Montreal to Costa Mesa in just under 9h 34m. Your travel time can differ by up to 2h 50m. Montreal and Costa Mesa are separated by a distance of 3969 km. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the cheapest airlines to fly from Montreal to Costa Mesa one-way?

    One-way options have recently been found by users for as low as C$ 155 on Porter Airlines. Other airlines that offer cheap prices include WestJet from C$ 156 and Air Canada from C$ 216 one-way.

  • What are the most reliable airlines from Montreal to Costa Mesa?

    Before booking your flight to Costa Mesa from Montreal, check out the most reliable airlines to get you to your destination on time: Brussels Airlines (68%), United Airlines (63%), Air New Zealand( 63%).

  • What are the cheapest flights from Montreal to Costa Mesa?

    Looking for the cheapest flight from Montreal to Costa Mesa? While on average our users pay C$ 1,240, our data indicates the cheapest price to be C$ 271. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles Los Angeles), is priced around C$ 491.

  • Can I find deals for flights from Montreal to Costa Mesa that include hotel bookings?

    Yes. In addition to deals on Montreal to Costa Mesa flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Montreal to Costa Mesa?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Montreal to Costa Mesa.

  • Can I find deals for business class flights from Montreal to Costa Mesa?

    Yes. Cheapflights offers flight deals from Montreal to Costa Mesa by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Montreal to Costa Mesa?

    Currently, April is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 186). Flying from Montreal to Costa Mesa in January is currently the most expensive (average of C$ 369). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Alternative routes for Montreal to Costa Mesa

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Top 6 airlines flying from Montreal to Costa Mesa

Discover the top 6 airlines that operate flights from Montreal to Costa Mesa. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 3 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 220AverageC$ 649FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
WestJetCheapestC$ 246AverageC$ 352FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 249AverageC$ 551FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
DeltaCheapestC$ 258AverageC$ 553FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Porter AirlinesCheapestC$ 263AverageC$ 434FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 366AverageC$ 701FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Montreal to Costa Mesa?

Cheapflights helps you search for flights from Montreal to Costa Mesa via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Montreal to Costa Mesa?

Millions of users choose and trust Cheapflights to book the best flight deals from Montreal to Costa Mesa for free. We help you search and compare prices from hundreds of airlines for the right flight just for you.

Can Cheapflights find flights from Montreal to Costa Mesa with no change fees?

Cheapflights does show flights with no change fees to all users. To see these options for flights from Montreal to Costa Mesa, users can toggle the no change fees filter when performing a flight search.

Can Cheapflights notify me if prices for flights from Montreal to Costa Mesa become cheaper?

Not ready to book yet? You can track prices for flights from Montreal to Costa Mesa on Cheapflights with our Price Alert feature and get notified when better prices are available.

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