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Cheap flights from Ottawa to Portsmouth from C$ 499

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 30/5. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
20 Mar — 27 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Ottawa to Portsmouth

Enter your travel dates to find the best prices.

Cheapest flights from Ottawa to Portsmouth
Explore the most affordable flight options available from Ottawa to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 18 February 2026.

Thu 30/45:55 a.m.
YOW
-
SOU
2 stops32h 35m
Multiple Airlines
Fri 22/58:00 p.m.
SOU
-
YOW
2 stops33h 22m
Multiple Airlines
Deal found 14/2C$ 1,272
Mon 16/35:40 a.m.
YOW
-
SOU
2 stops29h 55m
Multiple Airlines
Mon 23/38:10 p.m.
SOU
-
YOW
2 stops32h 29m
Multiple Airlines
Deal found 16/2C$ 1,535

Find flight deals from Ottawa to Portsmouth

Keep the following information in mind while searching for Ottawa to Portsmouth flight deals. Data was last updated 18 February 2026.

Round-trip from

C$ 1,272

One-way from

C$ 499

Popular in

December

Cheapest in

January

Average price

C$ 909
30/4-22/5
  • 30/4-22/5
  • 4 total stops
  • 65h 57m total
  • Ottawa to Portsmouth
Search Deals
30/5
  • 30/5
  • 3 total stops
  • 37h 00m total
  • Ottawa to Portsmouth
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (C$ 9 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 26 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Portsmouth 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 18 February 2026.
Use the filters below to find and compare flights from Ottawa to Portsmouth that are best for you.

Fly from

Ottawa

Fly to

Portsmouth

Route

Depart

Return

Price

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Thu 30/4

5:55 a.m.-7:30 p.m.

2 stops32h 35m

Southampton Eastleigh

Fri 22/5

8:00 p.m.-12:22 a.m.

2 stops33h 22m

C$ 1,272

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Mon 16/3

5:40 a.m.-3:35 p.m.

2 stops29h 55m

Southampton Eastleigh

Mon 23/3

8:10 p.m.-12:39 a.m.

2 stops32h 29m

C$ 1,535

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Sat 30/5

6:25 p.m.-12:25 p.m.

3 stops37h 00m

C$ 499

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Sat 23/5

6:25 p.m.-7:25 p.m.

3 stops20h 00m

C$ 1,414

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Sat 23/5

6:25 p.m.-8:35 a.m.

2 stops33h 10m

C$ 2,029

Flights are sorted by cheapest round-trip flights first.

Deals found on 14/2

Best time to book a flight from Ottawa to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Ottawa 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 Ottawa to Portsmouth

What is the cheapest month to book a flight from Ottawa to Portsmouth?

Currently, December is the cheapest month in which you can book a flight from Ottawa to Portsmouth (average of C$ 469). Flying from Ottawa to Portsmouth in July is currently the most expensive (average of C$ 880). 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 YOW to P0R?

Find hourly flight availability from Ottawa to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 18 February 2026.

When flying from Ottawa to Portsmouth, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Portsmouth?

    Located just 10.6 km from the city centre, Ottawa is the airport most travellers will use when flying to Portsmouth from Ottawa. Booking flights from Ottawa (YOW) to Portsmouth should be relatively easy as there are 0 daily outbound flights to Portsmouth from 6 different airlines.

  • What are the most reliable airlines from Ottawa to Portsmouth?

    Consider Aegean Airlines (33%), Croatia Airlines (33%) or Air Canada (29%) when booking your flight. These represent the most reliable airlines when flying from Ottawa to Portsmouth.

  • What are the cheapest flights from Ottawa to Portsmouth?

    Looking at all options, your cheapest flight can be booked for C$ 862. While the most popular route (Ottawa - Southampton Eastleigh) can be booked for C$ 1,535 on average, our data indicates C$ 1,042 when flying from Ottawa to Portsmouth.

  • Can I find deals for flights from Ottawa to Portsmouth that include hotel bookings?

    Yes. In addition to deals on Ottawa to Portsmouth flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Portsmouth?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Portsmouth.

  • Can I find deals for business class flights from Ottawa to Portsmouth?

    Yes. Cheapflights offers flight deals from Ottawa to Portsmouth 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 Ottawa to Portsmouth?

    Currently, December is the cheapest month in which you can book a flight from Ottawa to Portsmouth (average of C$ 469). Flying from Ottawa to Portsmouth in July is currently the most expensive (average of C$ 880). 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 Ottawa to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
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Top 6 airlines flying from Ottawa to Portsmouth

Discover the top 6 airlines that operate flights from Ottawa to Portsmouth. 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 18 February 2026.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 667AverageC$ 904FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Air FranceCheapestC$ 769AverageC$ 1,018FlexibilityNo cancel feeOn-time77%
Search Air France flights
Porter AirlinesCheapestC$ 776AverageC$ 1,229FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 880AverageC$ 1,095FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 890AverageC$ 1,030FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapestC$ 937AverageC$ 1,047FlexibilityNo cancel feeOn-time76%
Search Lufthansa 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 Ottawa to Portsmouth?

900+ travel sites are searched through when a user searches for a flight using Cheapflights. From the search interface, users can use filters to choose airlines, airports, flight times, cabin classes and more to their preference. Book your flight to Portsmouth from Ottawa today with Cheapflights!

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Portsmouth?

Cheapflights helps you find that perfect flight to Portsmouth from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Portsmouth with no change fees?

Certainly. Search results for flights to Portsmouth from Ottawa shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Ottawa to Portsmouth become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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