Cheap flights from Montreal to Costa Mesa from C$ 310
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 3/3. Fares are subject to change and may not be available on all flights or dates of travel.
YMQ — LAX
9 Mar — 16 Mar1
Round-trip
1 adult
Economy
Round-trip
1 adult, Economy, 0 bags
Cheapflights Tip: The best prices from Montreal to Costa Mesa are usually found in May or April, booked 56 days in advance, depart on a Friday or Thursday and return on a Tuesday
Cheap flight deals from Montreal to Costa Mesa
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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 7 February 2026.
Wed 29/46:45 a.m.
YUL
-
LAX
1 stop8h 54m
Porter Airlines
Mon 4/512:55 p.m.
LAX
-
YUL
1 stop8h 42m
Porter Airlines
Deal found 3/2C$ 410
Sat 25/46:45 a.m.
YUL
-
LAX
1 stop8h 54m
Porter Airlines
Sat 2/512:55 p.m.
LAX
-
YUL
1 stop8h 42m
Porter Airlines
Deal found 2/2C$ 412
Fri 6/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Sat 14/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 417
Mon 20/46:45 a.m.
YUL
-
LAX
2 stops13h 13m
WestJet
Mon 27/46:05 p.m.
LAX
-
YUL
1 stop9h 55m
WestJet
Deal found 5/2C$ 421
Mon 9/36:45 a.m.
YUL
-
LAX
2 stops13h 13m
WestJet
Mon 16/35:45 p.m.
LAX
-
YUL
1 stop10h 20m
WestJet
Deal found 3/2C$ 424
Wed 29/46:45 a.m.
YUL
-
LAX
1 stop8h 54m
Porter Airlines
Fri 8/512:55 p.m.
LAX
-
YUL
1 stop8h 42m
Porter Airlines
Deal found 6/2C$ 425
Mon 23/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Tue 31/310:55 p.m.
LAX
-
YUL
1 stop8h 25m
Air Canada
Deal found 6/2C$ 429
Best flights from Montreal to Costa Mesa
Discover carefully curated flight deals from Montreal to Costa Mesa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated 7 February 2026.
Wed 18/212:52 p.m.
YUL
-
LAX
1 stop10h 53m
Delta
Fri 20/211:55 p.m.
LAX
-
YUL
1 stop10h 45m
Delta
Deal found 4/2C$ 455
Fri 20/33:00 p.m.
YUL
-
LAX
1 stop10h 59m
United Airlines
Sun 29/311:02 p.m.
LAX
-
YUL
1 stop8h 38m
United Airlines
Deal found 5/2C$ 455
Wed 18/212:52 p.m.
YUL
-
LAX
1 stop10h 53m
Delta
Sat 21/29:55 p.m.
LAX
-
YUL
1 stop10h 30m
Delta
Deal found 4/2C$ 455
Wed 1/42:20 p.m.
YUL
-
LAX
2 stops11h 18m
United Airlines
Wed 8/49:20 p.m.
LAX
-
YUL
1 stop14h 20m
United Airlines
Deal found 6/2C$ 457
Mon 23/37:00 a.m.
YUL
-
LAX
1 stop11h 50m
Delta
Tue 31/311:55 p.m.
LAX
-
YUL
1 stop8h 42m
Delta
Deal found 6/2C$ 457
Fri 6/34:45 p.m.
YUL
-
LAX
1 stop10h 14m
United Airlines
Sat 14/34:54 p.m.
LAX
-
YUL
1 stop18h 06m
United Airlines
Deal found 6/2C$ 457
Mon 16/312:50 p.m.
YUL
-
LAX
1 stop8h 39m
Delta
Mon 23/310:55 p.m.
LAX
-
YUL
1 stop9h 42m
Delta
Deal found 6/2C$ 457
Sun 8/37:00 a.m.
YUL
-
LAX
1 stop11h 48m
Delta
Wed 11/311:30 p.m.
LAX
-
YUL
1 stop9h 29m
Delta
Deal found 6/2C$ 457
Mon 9/312:42 p.m.
YUL
-
LAX
1 stop14h 13m
Delta
Mon 16/39:55 p.m.
LAX
-
YUL
1 stop10h 42m
Delta
Deal found 6/2C$ 457
Sun 8/37:00 a.m.
YUL
-
LAX
1 stop11h 48m
Delta
Mon 16/311:55 p.m.
LAX
-
YUL
1 stop8h 42m
Delta
Deal found 6/2C$ 457
Wed 18/22:40 p.m.
YUL
-
LAX
1 stop9h 40m
Delta
Mon 23/210:55 p.m.
LAX
-
YUL
1 stop9h 30m
Delta
Deal found 4/2C$ 458
Direct flights from Montreal to Costa Mesa
Explore direct flight options from Montreal to Costa Mesa based on user searches, and compare prices and availability for your desired travel dates. Data last updated 7 February 2026.
Fri 6/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Sat 14/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 417
Wed 15/45:55 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Mon 20/412:15 p.m.
LAX
-
YUL
Nonstop5h 26m
Air Canada
Deal found 3/2C$ 450
Fri 6/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Fri 13/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 457
Sat 25/45:55 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Sat 2/510:30 p.m.
LAX
-
YUL
Nonstop5h 26m
Air Canada
Deal found 4/2C$ 459
Mon 9/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Fri 13/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 480
Wed 29/45:55 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Fri 8/512:25 p.m.
LAX
-
YUL
Nonstop5h 26m
Air Canada
Deal found 6/2C$ 485
Fri 8/54:50 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Sun 10/510:30 p.m.
LAX
-
YUL
Nonstop5h 26m
Air Canada
Deal found 4/2C$ 498
Fri 1/54:50 p.m.
YUL
-
LAX
Nonstop6h 04m
Air Canada
Fri 8/510:30 p.m.
LAX
-
YUL
Nonstop5h 26m
Air Canada
Deal found 5/2C$ 499
Last-minute flights from Montreal to Costa Mesa
Discover last-minute flight deals from Montreal to Costa Mesa. Data last updated 7 February 2026 and is based on user searches.
Wed 18/23:10 p.m.
YUL
-
LAX
1 stop9h 18m
Air Canada
Thu 19/28:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 440
Tue 24/21:25 p.m.
YUL
-
LAX
1 stop10h 43m
Air Canada
Fri 27/26:30 a.m.
LAX
-
YUL
1 stop11h 39m
Air Canada
Deal found 3/2C$ 450
Fri 6/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Sat 14/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Air Canada
Deal found 4/2C$ 417
Fri 6/36:45 a.m.
YUL
-
LAX
1 stop8h 54m
Multiple Airlines
Fri 13/38:15 a.m.
LAX
-
YUL
Nonstop5h 13m
Multiple Airlines
Deal found 4/2C$ 448
Mon 9/36:45 a.m.
YUL
-
LAX
2 stops13h 13m
WestJet
Mon 16/35:45 p.m.
LAX
-
YUL
1 stop10h 20m
WestJet
Deal found 3/2C$ 424
Thu 12/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Mon 16/310:50 p.m.
LAX
-
YUL
2 stops9h 50m
Air Canada
Deal found 4/2C$ 447
Mon 23/36:45 p.m.
YUL
-
LAX
Nonstop6h 15m
Air Canada
Tue 31/310:55 p.m.
LAX
-
YUL
1 stop8h 25m
Air Canada
Deal found 6/2C$ 429
Mon 30/36:45 a.m.
YUL
-
LAX
1 stop8h 54m
Porter Airlines
Fri 10/41:40 p.m.
LAX
-
YUL
1 stop7h 55m
Porter Airlines
Deal found 4/2C$ 446
One-way flights from Montreal to Costa Mesa
Search for one-way flight options from Montreal to Costa Mesa. Find affordable one-way fares based on user searches. Data last updated 7 February 2026.
Tue 3/37:30 p.m.
YUL
-
LAX
1 stop18h 57m
WestJet
Deal found 2/2C$ 310
Sun 8/310:55 a.m.
YUL
-
LAX
3 stops29h 50m
Multiple Airlines
Deal found 5/2C$ 317
Sun 22/36:45 a.m.
YUL
-
LAX
2 stops29h 21m
Multiple Airlines
Deal found 6/2C$ 319
Thu 5/38:25 a.m.
YUL
-
LAX
2 stops12h 02m
United Airlines
Deal found 5/2C$ 321
Tue 24/211:25 a.m.
YUL
-
LAX
3 stops14h 15m
Multiple Airlines
Deal found 3/2C$ 324
Mon 2/36:50 a.m.
YUL
-
LAX
3 stops35h 55m
Multiple Airlines
Deal found 5/2C$ 327
Tue 3/34:15 p.m.
YUL
-
LAX
3 stops20h 50m
Multiple Airlines
Deal found 2/2C$ 328
Sun 29/35:25 p.m.
YUL
-
LAX
3 stops26h 47m
Multiple Airlines
Deal found 5/2C$ 332
Sat 28/36:45 a.m.
YUL
-
LAX
2 stops13h 27m
Multiple Airlines
Deal found 5/2C$ 334
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 7 February 2026.
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 7 February 2026.
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 18/2
12:52 p.m.-8:45 p.m.
1 stop10h 53m
Los Angeles
Fri 20/2
11:55 p.m.-1:40 p.m.
1 stop10h 45m
C$ 455
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Fri 20/3
3:00 p.m.-10:59 p.m.
1 stop10h 59m
Los Angeles
Sun 29/3
11:02 p.m.-10:40 a.m.
1 stop8h 38m
C$ 455
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Wed 18/2
12:52 p.m.-8:45 p.m.
1 stop10h 53m
Los Angeles
Sat 21/2
9:55 p.m.-11:25 a.m.
1 stop10h 30m
C$ 455
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Wed 1/4
2:20 p.m.-10:38 p.m.
2 stops11h 18m
Los Angeles
Wed 8/4
9:20 p.m.-2:40 p.m.
1 stop14h 20m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Mon 23/3
7:00 a.m.-3:50 p.m.
1 stop11h 50m
Los Angeles
Tue 31/3
11:55 p.m.-11:37 a.m.
1 stop8h 42m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Fri 6/3
4:45 p.m.-11:59 p.m.
1 stop10h 14m
Los Angeles
Sat 14/3
4:54 p.m.-2:00 p.m.
1 stop18h 06m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Mon 16/3
12:50 p.m.-6:29 p.m.
1 stop8h 39m
Los Angeles
Mon 23/3
10:55 p.m.-11:37 a.m.
1 stop9h 42m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Sun 8/3
7:00 a.m.-3:48 p.m.
1 stop11h 48m
Los Angeles
Wed 11/3
11:30 p.m.-11:59 a.m.
1 stop9h 29m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Mon 9/3
12:42 p.m.-11:55 p.m.
1 stop14h 13m
Los Angeles
Mon 16/3
9:55 p.m.-11:37 a.m.
1 stop10h 42m
C$ 457
MontrealLos Angeles
YUL - LAX
YULLAX
Montreal Pierre Elliott Trudeau Intl
Sun 8/3
7:00 a.m.-3:48 p.m.
1 stop11h 48m
Los Angeles
Mon 16/3
11:55 p.m.-11:37 a.m.
1 stop8h 42m
C$ 457
Flights are sorted by cheapest round-trip flights first.
Deals found on 2/2
Showing 1-10 of 22 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.
YUL-LAX
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
YMQ-CM3
YUL-LAX
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 30 January 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$ 183). Flying from Montreal to Costa Mesa in November is currently the most expensive (average of C$ 349). 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 7 February 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.
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 7 February 2026.
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.
It's good. Planes are new and fresh. WiFi is best and stands out
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?
Delta and United Airlines can get you from Montreal to Costa Mesa in just under 10h 53m. Your travel time can differ by up to 06m. 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$ 153 on WestJet. Other airlines that offer cheap prices include Porter Airlines from C$ 164 and Air Canada from C$ 205 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 (62%), United Airlines (57%), Air New Zealand( 57%).
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$ 1,197, our data indicates the cheapest price to be C$ 269. The most popular route (Montreal Pierre Elliott Trudeau Intl - Los Angeles), is priced around C$ 424.
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$ 183). Flying from Montreal to Costa Mesa in November is currently the most expensive (average of C$ 349). 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.
Browse through other flights departing from Montreal. Flights are based on user searches made on Cheapflights and were last updated on 7 February 2026.
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 7 February 2026.
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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