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Cheap flights from Ottawa to Portsmouth from C$ 485

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 20/7. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — LHR
9 Jul — 16 Jul1
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 9 June 2026.

Wed 26/85:10 p.m.
YOW
-
SOU
2 stops19h 25m
KLM
Tue 8/95:20 p.m.
SOU
-
YOW
2 stops26h 40m
KLM
Deal found 8/6C$ 1,268
Wed 26/86:55 a.m.
YOW
-
SOU
2 stops44h 30m
Multiple Airlines
Tue 8/93:15 p.m.
SOU
-
YOW
2 stops38h 05m
Multiple Airlines
Deal found 7/6C$ 1,272

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 9 June 2026.

Round-trip from

C$ 1,268

One-way from

C$ 485

Popular in

July

Cheapest in

February

Average price

C$ 1,100
KLM
  • KLM
  • 26/8-8/9
  • 4 total stops
  • 46h 05m total
  • Ottawa to Portsmouth
Search Deals
20/7
  • 20/7
  • 3 total stops
  • 44h 10m total
  • Ottawa to Portsmouth
Search Deals
Highest demand for flights based on searches. 9% potential increase in price (C$ 153 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 28 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in June 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 9 June 2026.
Use the filters below to find and compare flights from Ottawa to Portsmouth that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Wed 26/8

5:10 p.m.-5:35 p.m.

2 stops19h 25m

Southampton Eastleigh

Tue 8/9

5:20 p.m.-3:00 p.m.

2 stops26h 40m

C$ 1,268

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Wed 26/8

6:55 a.m.-8:25 a.m.

2 stops44h 30m

Southampton Eastleigh

Tue 8/9

3:15 p.m.-12:20 a.m.

2 stops38h 05m

C$ 1,272
Cheapest one-way
Quickest one-way

OttawaSouthampton

YOW - SOU

YOWSOU

Ottawa

Mon 20/7

6:55 a.m.-8:05 a.m.

3 stops44h 10m

C$ 485

Flights are sorted by cheapest round-trip flights first.

Deals found on 5/6

Sorted by cheapest first

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 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 9 June 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.

  • How long is the flight from Ottawa to Portsmouth?

    A quick flight from Ottawa to Portsmouth can take about 19h 25m. KLM provides one of the quickest options available for as low as C$ 1,268. Ottawa and Portsmouth are separated by a distance of 5309 km.

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

    Consider United Airlines (71%), Air Canada (66%) or Aegean Airlines (66%) 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$ 906. While the most popular route (Ottawa - Southampton Eastleigh) can be booked for C$ 1,268 on average, our data indicates C$ 1,370 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.

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 9 June 2026.
AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 682AverageC$ 952FlexibilityNo cancel feeOn-time50%
Search Air Transat flights
Porter AirlinesCheapestC$ 761AverageC$ 1,401FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
Air FranceCheapestC$ 786AverageC$ 1,205FlexibilityNo cancel feeOn-time77%
Search Air France flights
United AirlinesCheapestC$ 899AverageC$ 1,192FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 912AverageC$ 1,121FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapestC$ 948AverageC$ 1,143FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights

Fly with Cheapflights

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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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