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Cheap flights from Montreal to Costa Mesa from C$ 210

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 5/10. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
17 Oct — 24 Oct1
1 adult
1 adult, Economy

Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in May or April, booked 86 days in advance, depart on a Thursday or Wednesday and return on a Tuesday

Cheap 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 17 September 2025.

Round-trip from

C$ 293

One-way from

C$ 210

Popular in

December

Cheapest in

May

Average price

C$ 464
Air Canada
  • Air Canada
  • 11/10-15/10
  • Nonstop
  • 11h 13m total
  • Montreal to Costa Mesa
Search Deals
WestJet
  • WestJet
  • 5/10
  • 2 total stops
  • 31h 07m total
  • Montreal to Costa Mesa
Search Deals
Highest demand for flights based on searches. 11% potential increase in price (C$ 90 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals

Find flight deals from Montreal to Costa Mesa

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 17 September 2025.

Fri 3/103:41 p.m.YUL - LAX
1 stop10h 21mMultiple Airlines
Sat 4/108:05 a.m.LAX - YUL
Nonstop5h 15mMultiple Airlines
Deal found 16/9C$ 293
Fri 17/106:45 p.m.YUL - LAX
Nonstop5h 50mAir Canada
Mon 20/1010:30 p.m.LAX - YUL
Nonstop5h 23mAir Canada
Deal found 16/9C$ 294
Sun 12/107:00 a.m.YUL - LAX
1 stop30h 52mWestJet
Wed 15/106:05 p.m.LAX - YUL
2 stops27h 22mWestJet
Deal found 16/9C$ 296
Wed 15/106:45 a.m.YUL - LAX
2 stops14h 24mWestJet
Tue 21/106:55 p.m.LAX - YUL
2 stops26h 32mWestJet
Deal found 16/9C$ 297
Thu 2/109:15 a.m.YUL - LAX
2 stops11h 00mUnited Airlines
Mon 6/1011:59 p.m.LAX - YUL
2 stops10h 10mUnited Airlines
Deal found 16/9C$ 300
Fri 17/106:30 p.m.YUL - LAX
1 stop19h 05mMultiple Airlines
Mon 20/108:05 a.m.LAX - YUL
Nonstop5h 15mMultiple Airlines
Deal found 16/9C$ 301
Fri 3/107:00 a.m.YUL - LAX
1 stop30h 52mWestJet
Fri 10/106:05 p.m.LAX - YUL
1 stop27h 36mWestJet
Deal found 15/9C$ 304
Fri 3/107:00 a.m.YUL - LAX
1 stop8h 33mAir Canada
Sun 12/107:30 a.m.LAX - YUL
1 stop7h 50mAir Canada
Deal found 16/9C$ 305
Thu 2/102:20 p.m.YUL - LAX
1 stop9h 43mUnited Airlines
Tue 7/1011:00 p.m.LAX - YUL
1 stop8h 40mUnited Airlines
Deal found 17/9C$ 307
Tue 7/106:45 a.m.YUL - LAX
2 stops14h 24mWestJet
Tue 14/1012:35 p.m.LAX - YUL
2 stops32h 52mWestJet
Deal found 15/9C$ 308
Mon 29/98:10 a.m.YUL - LAX
1 stop30h 33mWestJet
Wed 1/109:10 p.m.LAX - YUL
2 stops24h 17mWestJet
Deal found 16/9C$ 310

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 17 September 2025.
Use the filters below to find and compare flights from Montreal to Costa Mesa that are best for you.

Fly from

Montreal

Fly to

Costa Mesa

Route

Depart

Return

Price

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 7/10

6:15 a.m.-3:00 p.m.

2 stops11h 45m

Los Angeles

Wed 15/10

9:30 p.m.-8:16 a.m.

1 stop7h 46m

C$ 300

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 17/10

8:10 a.m.-11:05 a.m.

Nonstop5h 55m

Los Angeles

Sat 25/10

12:05 p.m.-8:28 p.m.

Nonstop5h 23m

C$ 343

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sun 22/2

6:45 a.m.-12:39 p.m.

1 stop8h 54m

Los Angeles

Sun 1/3

1:40 p.m.-12:50 a.m.

1 stop8h 10m

C$ 450

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 21/2

6:45 a.m.-12:39 p.m.

1 stop8h 54m

Los Angeles

Sat 28/2

1:40 p.m.-12:35 a.m.

1 stop7h 55m

C$ 450

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 29/9

6:30 p.m.-12:32 a.m.

1 stop9h 02m

Los Angeles

Tue 30/9

12:56 a.m.-3:00 p.m.

2 stops11h 04m

C$ 461

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 27/9

9:15 a.m.-7:27 p.m.

2 stops13h 12m

Los Angeles

Thu 2/10

6:00 a.m.-9:29 p.m.

1 stop12h 29m

C$ 461

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 23/1

2:13 p.m.-11:43 p.m.

2 stops12h 30m

Los Angeles

Sat 31/1

12:55 a.m.-3:16 p.m.

2 stops11h 21m

C$ 468

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Thu 11/12

6:00 a.m.-1:17 p.m.

1 stop10h 17m

Los Angeles

Sun 14/12

12:25 a.m.-2:00 p.m.

1 stop10h 35m

C$ 468

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 24/1

6:00 a.m.-1:30 p.m.

1 stop10h 30m

Los Angeles

Sat 31/1

8:30 a.m.-4:43 p.m.

Nonstop5h 13m

C$ 469

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 24/1

3:00 p.m.-12:34 a.m.

2 stops12h 34m

Los Angeles

Fri 30/1

12:30 a.m.-2:00 p.m.

1 stop10h 30m

C$ 469

Flights are sorted by cheapest round-trip flights first.

Deals found on 15/9

Showing 1-10 of 24 results
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 12 September 2025.

The best time to book flights from Montreal to Costa Mesa is 86 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, May is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 231). Flying from Montreal to Costa Mesa in March is currently the most expensive (average of C$ 295). 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 17 September 2025.

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.

What is the cheapest day to fly from Montreal to Costa Mesa?

Use this chart to determine the cheapest time to fly round-trip from Montreal to Costa Mesa. Price data was last updated on 16 December 2024.

Travelers seeking maximum savings on their Montreal to Costa Mesa flight should consider departing on Wednesday at noon when fares are most often at their lowest. Wednesday evenings flights should be avoided if possible as fares are typically the most expensive at this time.

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 17 September 2025.

The most flights from YMQ to CM3 are scheduled on a Monday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (10 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 17 September 2025.
Get a feel of what it's like to fly with Porter Airlines,United Airlines, andAmerican 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
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
365 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,926 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
WestJet
7.2
Good
3,095 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
365 reviews
Check prices

Overall

7.9

Boarding

8.2

Food

7.6

Comfort

7.9

Crew

8.6

Entertainment

7.0

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

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 Porter Airlines can get you from Montreal to Costa Mesa in just under 8h 54m. Your travel time can differ by up to 2h 51m. 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$ 232 on United Airlines. Other airlines that offer cheap prices include Air Canada from C$ 238 and Porter Airlines from C$ 243 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: Air Canada (72%), Brussels Airlines (68%), United Airlines( 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$ 1,547, our data indicates the cheapest price to be C$ 338. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 237.

  • 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, May is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 231). Flying from Montreal to Costa Mesa in March is currently the most expensive (average of C$ 295). 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

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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 17 September 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 245AverageC$ 362FlexibilityNo cancel feeOn-time60%
Search WestJet flights
DeltaCheapestC$ 255AverageC$ 501FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
American AirlinesCheapestC$ 264AverageC$ 569FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Porter AirlinesCheapestC$ 290AverageC$ 398FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air CanadaCheapestC$ 365AverageC$ 600FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 372AverageC$ 678FlexibilityNo 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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