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Cheap flights from Montreal to Costa Mesa from C$ 358

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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
12 Aug — 19 Aug1
1 adult
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in September or October, booked 56 days in advance, depart on a Friday or Thursday 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 13 July 2026.

Thu 1/107:15 a.m.
YUL
-
LAX
1 stop12h 55m
WestJet
Sun 25/107:00 a.m.
LAX
-
YUL
1 stop29h 12m
WestJet
Deal found 8/7C$ 586
Tue 15/95:45 p.m.
YUL
-
LAX
2 stops25h 15m
WestJet
Wed 23/96:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 9/7C$ 587
Sun 20/97:15 a.m.
YUL
-
LAX
1 stop17h 50m
WestJet
Sun 27/97:30 a.m.
LAX
-
YUL
1 stop13h 15m
WestJet
Deal found 10/7C$ 589
Tue 13/106:45 a.m.
YUL
-
LAX
1 stop9h 35m
Porter Airlines
Fri 16/102:20 p.m.
LAX
-
YUL
1 stop7h 17m
Porter Airlines
Deal found 10/7C$ 590
Wed 23/96:45 a.m.
YUL
-
LAX
1 stop9h 35m
Porter Airlines
Sat 26/92:20 p.m.
LAX
-
YUL
1 stop7h 17m
Porter Airlines
Deal found 10/7C$ 591
Thu 27/87:15 a.m.
YUL
-
LAX
1 stop9h 50m
WestJet
Wed 2/93:00 p.m.
LAX
-
YUL
1 stop13h 05m
WestJet
Deal found 11/7C$ 593
Mon 17/87:15 a.m.
YUL
-
LAX
1 stop9h 50m
WestJet
Mon 31/87:30 a.m.
LAX
-
YUL
2 stops30h 15m
WestJet
Deal found 10/7C$ 594
Fri 21/86:45 a.m.
YUL
-
LAX
2 stops13h 25m
WestJet
Mon 24/86:05 p.m.
LAX
-
YUL
2 stops19h 40m
WestJet
Deal found 12/7C$ 596
Wed 14/107:15 a.m.
YUL
-
LAX
2 stops11h 45m
WestJet
Sat 17/106:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 10/7C$ 597
Sat 12/97:15 a.m.
YUL
-
LAX
2 stops14h 05m
WestJet
Mon 12/107:30 a.m.
LAX
-
YUL
2 stops13h 55m
WestJet
Deal found 11/7C$ 599
Fri 18/98:00 p.m.
YUL
-
LAX
1 stop19h 25m
WestJet
Tue 29/96:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 10/7C$ 600
Tue 4/88:00 p.m.
YUL
-
LAX
1 stop19h 25m
WestJet
Mon 10/86:05 p.m.
LAX
-
YUL
1 stop10h 00m
WestJet
Deal found 9/7C$ 601

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 13 July 2026.

Round-trip from

C$ 586

One-way from

C$ 358

Popular in

June

Cheapest in

September

Average price

C$ 647
WestJet
  • WestJet
  • 1/10-25/10
  • 2 total stops
  • 42h 07m total
  • Montreal to Costa Mesa
Search Deals
7/8
  • 7/8
  • 2 total stops
  • 19h 30m total
  • Montreal to Costa Mesa
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 94 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 18 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 13 July 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

Sat 29/8

9:45 a.m.-7:21 p.m.

1 stop12h 36m

Los Angeles

Mon 31/8

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

1 stop9h 05m

C$ 659
Quickest round-trip

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sun 20/9

6:35 p.m.-12:31 a.m.

1 stop8h 56m

Los Angeles

Sat 3/10

10:30 p.m.-6:44 a.m.

Nonstop5h 14m

C$ 659

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 4/9

6:00 a.m.-6:41 p.m.

1 stop15h 41m

Los Angeles

Mon 7/9

9:29 p.m.-8:16 a.m.

1 stop7h 47m

C$ 659

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Thu 6/8

7:00 a.m.-4:19 p.m.

1 stop12h 19m

Los Angeles

Tue 11/8

12:37 p.m.-11:40 p.m.

1 stop8h 03m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 18/8

6:51 p.m.-12:41 a.m.

1 stop8h 50m

Los Angeles

Fri 28/8

8:20 a.m.-11:52 p.m.

1 stop12h 32m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 19/8

9:45 a.m.-3:32 p.m.

1 stop8h 47m

Los Angeles

Wed 2/9

12:25 p.m.-8:48 p.m.

Nonstop5h 23m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 24/8

6:10 a.m.-1:00 p.m.

1 stop9h 50m

Los Angeles

Sun 30/8

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

1 stop9h 05m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 5/8

6:00 a.m.-2:34 p.m.

1 stop11h 34m

Los Angeles

Mon 10/8

10:40 p.m.-11:39 a.m.

1 stop9h 59m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 26/8

9:45 a.m.-5:37 p.m.

1 stop10h 52m

Los Angeles

Sun 30/8

12:10 a.m.-10:40 a.m.

1 stop7h 30m

C$ 661

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 12/8

9:45 a.m.-4:32 p.m.

1 stop9h 47m

Los Angeles

Wed 19/8

10:30 p.m.-6:48 a.m.

Nonstop5h 18m

C$ 671

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/7

Showing 1-10 of 24 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

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 13 July 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 13 July 2026.

The most flights from YMQ to CM3 are scheduled on a Monday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (7 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 13 July 2026.
Get a feel of what it's like to fly with Porter Airlines,Delta, andUnited Airlines 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
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Porter Airlines
8.0
Very good
443 reviews
Porter Airlines
8.0
Very good
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Delta
7.8
Good
8,465 reviews
Porter Airlines
8.0
Very good
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
United Airlines
7.4
Good
9,985 reviews
Porter Airlines
8.0
Very good
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
WestJet
7.2
Good
3,410 reviews
Porter Airlines
8.0
Very good
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.
Air Canada
7.1
Good
11,334 reviews
Porter Airlines
8.0
Very good
443 reviews
Check prices

Entertainment

6.9

Crew

8.6

Boarding

8.2

Food

7.5

Overall

8.0

Comfort

8.0

Reviews

1 / 20
6.0
Good

Justin,May 2026

YYZ - MCO

Staff very nice. Seats were uncomfortable. Complimentary snacks leave much to be desired.

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 12h 19m. Your travel time can differ by up to 17m. 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$ 220 on Air Canada. Other airlines that offer cheap prices include WestJet from C$ 226 and Porter Airlines from C$ 241 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 (70%), Air Canada (65%), United Airlines( 62%).

  • 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$ 1,730, our data indicates the cheapest price to be C$ 378. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 480.

  • 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.

See more FAQs

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Alternative routes for Montreal to Costa Mesa

See prices for flight routes from nearby airports that may be better suited for you.
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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 13 July 2026.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapestC$ 262AverageC$ 581FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
WestJetCheapestC$ 284AverageC$ 441FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Porter AirlinesCheapestC$ 284AverageC$ 527FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 328AverageC$ 640FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 351AverageC$ 686FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 371AverageC$ 687FlexibilityNo 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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