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Cheap flights from Montreal to Costa Mesa from C$ 202

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 22/8. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
5 Aug — 12 Aug1
1 adult

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 Saturday

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 31 July 2025.

Round-trip from

C$ 302

One-way from

C$ 203

Popular in

December

Cheapest in

May

Average price

C$ 591
Air Canada
  • Air Canada
  • 20/8-31/8
  • Nonstop
  • 11h 26m total
  • Montreal to Costa Mesa
Search Deals
Air Canada
  • Air Canada
  • 29/8
  • Nonstop
  • 5h 57m total
  • Montreal to Costa Mesa
Search Deals
Highest demand for flights based on searches. 10% potential increase in price (C$ 87 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease (C$ 25 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 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 31 July 2025.

Wed 20/88:10 a.m.YUL - LAX
Nonstop5h 57mAir Canada
Sun 31/810:30 p.m.LAX - YUL
Nonstop5h 29mAir Canada
Deal found 29/7C$ 302
Wed 20/87:00 a.m.YUL - LAX
2 stops14h 10mWestJet
Wed 27/811:40 a.m.LAX - YUL
1 stop10h 03mWestJet
Deal found 30/7C$ 313
Sun 31/86:45 a.m.YUL - LAX
1 stop9h 15mPorter Airlines
Sat 6/92:00 p.m.LAX - YUL
1 stop7h 37mPorter Airlines
Deal found 29/7C$ 314
Mon 25/87:00 a.m.YUL - LAX
1 stop10h 12mMultiple Airlines
Wed 27/82:00 p.m.LAX - YUL
1 stop7h 37mMultiple Airlines
Deal found 29/7C$ 328
Wed 27/86:00 a.m.YUL - LAX
1 stop8h 59mUnited Airlines
Tue 2/911:16 p.m.LAX - YUL
1 stop12h 44mUnited Airlines
Deal found 31/7C$ 363
Mon 18/83:44 p.m.YUL - LAX
1 stop7h 49mAmerican Airlines
Sun 24/812:45 a.m.LAX - YUL
1 stop11h 09mAmerican Airlines
Deal found 28/7C$ 381

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 31 July 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

Wed 20/8

8:10 a.m.-11:07 a.m.

Nonstop5h 57m

Los Angeles

Sun 31/8

10:30 p.m.-6:59 a.m.

Nonstop5h 29m

C$ 302

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 20/8

7:00 a.m.-6:10 p.m.

2 stops14h 10m

Los Angeles

Wed 27/8

11:40 a.m.-12:43 a.m.

1 stop10h 03m

C$ 313

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sun 31/8

6:45 a.m.-1:00 p.m.

1 stop9h 15m

Los Angeles

Sat 6/9

2:00 p.m.-12:37 a.m.

1 stop7h 37m

C$ 314

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 25/8

7:00 a.m.-2:12 p.m.

1 stop10h 12m

Los Angeles

Wed 27/8

2:00 p.m.-12:37 a.m.

1 stop7h 37m

C$ 328

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 27/8

6:00 a.m.-11:59 a.m.

1 stop8h 59m

Los Angeles

Tue 2/9

11:16 p.m.-3:00 p.m.

1 stop12h 44m

C$ 363

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 18/8

3:44 p.m.-8:33 p.m.

1 stop7h 49m

Los Angeles

Sun 24/8

12:45 a.m.-2:54 p.m.

1 stop11h 09m

C$ 381

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 22/8

4:45 p.m.-7:40 p.m.

Nonstop5h 55m

C$ 202

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Mon 25/8

7:00 a.m.-2:12 p.m.

1 stop10h 12m

C$ 206

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Thu 21/8

6:00 a.m.-4:07 p.m.

2 stops13h 07m

C$ 223

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sun 21/9

6:45 a.m.-1:00 p.m.

1 stop9h 15m

C$ 241

Flights are sorted by cheapest round-trip flights first.

Deals found on 29/7

Showing 1-10 of 11 results
1
2

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 25 July 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, September is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 229). Flying from Montreal to Costa Mesa in March is currently the most expensive (average of C$ 297). 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 31 July 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. Sunday 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 31 July 2025.

The most flights from YMQ to CM3 are scheduled on a Wednesday (10 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (6 on average).

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 31 July 2025.
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
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
318 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Delta
8.0
Very good
7,981 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,900 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
American Airlines
7.2
Good
10,000 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
WestJet
7.2
Good
2,978 reviews
Porter Airlines
8.0
Very good
318 reviews
Check prices

Overall

8.0

Crew

8.7

Boarding

8.2

Entertainment

7.0

Comfort

8.0

Food

7.6

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

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.

  • 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$ 203 on Air Canada. Other airlines that offer cheap prices include WestJet from C$ 206 and Porter Airlines from C$ 208 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 (86%), United Airlines (76%), Air New Zealand( 76%).

  • 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$ 4,455, our data indicates the cheapest price to be C$ 215. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 320.

  • 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, September is the cheapest month in which you can book a flight from Montreal to Costa Mesa (average of C$ 229). Flying from Montreal to Costa Mesa in March is currently the most expensive (average of C$ 297). 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 7 airlines flying from Montreal to Costa Mesa

Discover the top 7 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 31 July 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 247AverageC$ 387FlexibilityNo cancel feeOn-time60%
Search WestJet flights
American AirlinesCheapestC$ 266AverageC$ 572FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Porter AirlinesCheapestC$ 292AverageC$ 398FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
DeltaCheapestC$ 350AverageC$ 506FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air CanadaCheapestC$ 373AverageC$ 611FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 378AverageC$ 673FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air TransatCheapestC$ 497AverageC$ 526FlexibilityNo cancel feeOn-time50%
Search Air Transat 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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