Cheap flights from Montreal to San Diego from C$ 276

In general, October is the cheapest month to fly from Montreal to San Diego. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around C$ 587. If you are unable to visit San Diego during the month of October, then departing from Montreal during the month September is also very affordable. Most momondo users find prices during this month for around C$ 609.

The cheapest day to depart on your flight to San Diego is on a Monday when prices can be found for as low as C$ 574. This is often the case because there is less demand to fly during this day of the week. Be sure to avoid booking your departure on a Tuesday as prices are generally higher than usual. According to our data, the average ticket price to San Diego on Tuesday is C$ 667.

Fly from Montreal Pierre Elliott Trudeau Intl to San Diego for the best Montreal - San Diego flight prices

You are more likely to see cheaper flights to San Diego from Montreal when booking weeks ahead of your departure date. In general, you can expect to find flights to San Diego for around C$ 674 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to San Diego from Montreal for as low as C$ 470 on momondo.

There are 2 cabin classes available to choose from on Montreal to San Diego flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

You could potentially save up to 9% on your flight if you consider stops on a Montreal to San Diego flight.

Air Canada is the most popular carrier operating from Montreal to San Diego

Air Canada, Delta and United Airlines are the top three most popular airlines that fly to San Diego from Montreal according to our data. Air Canada is the first choice among our users, with 62% of people opting to fly with this airline when travelling to San Diego. Keep in mind that there are 4 different airlines that fly to San Diego on a routine basis, so you have a few additional options to choose from.

Toronto (YYZ) was the most common stop: 31% of momondo users choosing one-stop flights on this route connected there.

Flights via Detroit (DTW) offer the lowest average round-trip price of C$ 504.

Flights connecting via Chicago (ORD) have the shortest average one-way travel time: 8h 05m.

Chicago (ORD) has the shortest average layover time for this route: 0h 58m.

1 flights are operational daily from Montreal to San Diego as of October 2026. The most popular departure time for this route is 5:00p.m., with 100% of flights per day taking off in the afternoon.

12 flights are operational weekly from Montreal to San Diego as of October 2026. The most popular departure day for this route is Mon, with 17% of flights per week taking off on this day.