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Cheap flights from Montreal to Costa Mesa from C$ 215

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 9/9. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
6 Apr — 13 Apr1
1 adult

Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in September or October, booked 61 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 1 April 2025.

Round-trip from

C$ 345

One-way from

C$ 217

Popular in

December

Cheapest in

September

Average price

C$ 583
WestJet
  • WestJet
  • 25/8-8/9
  • 4 total stops
  • 42h 17m total
  • Montreal to Costa Mesa
Search Deals
WestJet
  • WestJet
  • 25/7
  • 2 total stops
  • 31h 08m total
  • Montreal to Costa Mesa
Search Deals
Highest demand for flights based on searches. 5% potential increase in price (C$ 50 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (C$ 23 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 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 1 April 2025.

Sat 29/117:00 a.m.YUL - LAX
2 stops17h 42mWestJet
Tue 9/127:00 a.m.LAX - YUL
2 stops14h 40mWestJet
Deal found 1/4C$ 345
Fri 11/76:45 a.m.YUL - LAX
1 stop9h 15mMultiple Airlines
Sat 2/811:10 p.m.LAX - YUL
1 stop22h 27mMultiple Airlines
Deal found 31/3C$ 350
Tue 8/46:45 a.m.YUL - LAX
1 stop8h 35mPorter Airlines
Tue 15/41:25 p.m.LAX - YUL
1 stop8h 10mPorter Airlines
Deal found 1/4C$ 365
Sun 1/68:05 a.m.YUL - LAX
Nonstop6h 00mUnited Airlines
Tue 24/610:30 p.m.LAX - YUL
Nonstop5h 29mUnited Airlines
Deal found 1/4C$ 393
Thu 5/67:30 a.m.YUL - LAX
1 stop10h 32mAir Canada
Fri 22/810:30 p.m.LAX - YUL
Nonstop5h 29mAir Canada
Deal found 1/4C$ 401
Sat 19/47:47 a.m.YUL - LAX
2 stops16h 03mAmerican Airlines
Sun 20/46:00 a.m.LAX - YUL
1 stop13h 44mAmerican Airlines
Deal found 1/4C$ 437
Fri 18/46:00 p.m.YUL - LAX
1 stop9h 52mDelta
Wed 23/41:40 p.m.LAX - YUL
1 stop6h 48mDelta
Deal found 1/4C$ 534

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 1 April 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

Mon 25/8

5:30 p.m.-6:10 p.m.

2 stops27h 40m

Los Angeles

Mon 8/9

7:00 a.m.-12:37 a.m.

2 stops14h 37m

C$ 345

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 29/4

6:45 a.m.-5:17 p.m.

2 stops13h 32m

Los Angeles

Thu 1/5

1:10 p.m.-12:37 a.m.

1 stop8h 27m

C$ 347

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 29/4

6:45 a.m.-12:20 p.m.

1 stop8h 35m

Los Angeles

Thu 8/5

1:10 p.m.-12:37 a.m.

1 stop8h 27m

C$ 376

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Fri 2/5

4:45 p.m.-8:31 p.m.

1 stop30h 46m

Los Angeles

Sun 4/5

5:00 a.m.-3:26 p.m.

1 stop7h 26m

C$ 388

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Wed 17/9

8:05 a.m.-8:07 p.m.

1 stop15h 02m

Los Angeles

Wed 17/9

10:50 p.m.-1:54 p.m.

1 stop12h 04m

C$ 412

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 19/4

7:47 a.m.-8:50 p.m.

2 stops16h 03m

Los Angeles

Sun 20/4

6:00 a.m.-10:44 p.m.

1 stop13h 44m

C$ 437

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Thu 24/4

12:50 p.m.-8:00 p.m.

1 stop10h 10m

Los Angeles

Wed 30/4

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

1 stop7h 00m

C$ 505

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 9/9

7:00 a.m.-8:21 p.m.

2 stops16h 21m

C$ 215

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Tue 8/4

6:45 a.m.-12:20 p.m.

1 stop8h 35m

C$ 220

MontrealLos Angeles

YUL - LAX

YULLAX

Montreal Pierre Elliott Trudeau Intl

Sat 26/4

6:45 a.m.-8:05 p.m.

1 stop16h 20m

C$ 247

Flights are sorted by cheapest round-trip flights first.

Deals found on 31/3

Showing 1-10 of 14 results
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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 28 March 2025.

The best time to book flights from Montreal to Costa Mesa is 61 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$ 230). Flying from Montreal to Costa Mesa in July is currently the most expensive (average of C$ 314). 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 1 April 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 1 April 2025.

The most flights from YMQ to CM3 are scheduled on a Monday (7 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (4 on average).

Rainfall in Costa Mesa by month

Plan your trip to Costa Mesa by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Costa Mesa ranges from 0.0 - 87.0 mm per month. February is typically the wettest month, when rainfall can reach 87.0 mm. July is typically the driest time to visit Costa Mesa when rainfall is around 0.0 mm.

Temperature in Costa Mesa by month

Plan your trip to Costa Mesa by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Costa Mesa, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 23.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 14.0 C).

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 1 April 2025.
Read through reviews of airlines operating flights from Montreal to Costa Mesa, such as Delta, Porter Airlines and United Airlines. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Delta
8.0
Very good
7,899 reviews
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
Porter Airlines
7.9
Good
278 reviews
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
United Airlines
7.4
Good
8,615 reviews
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception
WestJet
7.2
Good
2,789 reviews
Delta
8.0
Very good
7,899 reviews
Check prices

Crew

8.5

Food

7.3

Boarding

8.2

Entertainment

7.9

Overall

8.0

Comfort

8.0

Reviews

1 / 20
10.0
Excellent

Aaron,Oct 2024

TUS - LAX

Delta has consistently been the best U.S. airline for my travels and this flight was no exception

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$ 217 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 227 and Air Canada from C$ 237 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 (73%), United Airlines (73%), Air New Zealand( 73%).

  • 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$ 473, our data indicates the cheapest price to be C$ 248. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 260.

  • 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$ 230). Flying from Montreal to Costa Mesa in July is currently the most expensive (average of C$ 314). 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 1 April 2025.
AirlineCheapestAverageFlexibilityOn-time
WestJetCheapestC$ 312AverageC$ 510FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Porter AirlinesCheapestC$ 323AverageC$ 500FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
American AirlinesCheapestC$ 399AverageC$ 621FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Air CanadaCheapestC$ 401AverageC$ 617FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
United AirlinesCheapestC$ 410AverageC$ 693FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
DeltaCheapestC$ 435AverageC$ 566FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Air TransatCheapestC$ 528AverageC$ 581FlexibilityNo 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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