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Cheap flights from Ottawa to Portsmouth from C$ 440

YOW — LHR
25 Sep — 2 Oct1
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

Fri 9/106:25 p.m. -
2 stops20h 05m
Fri 16/109:20 a.m. -
2 stops25h 15m
Deal found 25/8C$ 1,404
Wed 26/86:55 a.m. -
2 stops44h 30m
Tue 8/97:55 p.m. -
2 stops33h 25m
Deal found 21/8C$ 1,631

Find flight deals from Ottawa to Portsmouth

Round-trip from

C$ 1,404

One-way from

C$ 440

Popular in

December

Cheapest in

September

Average price

C$ 1,069
9/10-16/10
  • 9/10-16/10
  • 4 total stops
  • 45h 20m total
  • Ottawa to Portsmouth
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9/10
  • 9/10
  • 3 total stops
  • 48h 15m total
  • Ottawa to Portsmouth
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Highest demand for flights based on searches. 2% potential increase in price (C$ 34 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease (C$ 30 potential savings vs. average RT price).
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Average for round-trip flights in August 2026
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Cheapflights Fare Finder

 
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 Ottawa - SOU Southampton Eastleigh

YOWSOU

Ottawa

Fri 9/10

6:25 p.m.-7:30 p.m.

2 stops20h 05m

Southampton Eastleigh

Fri 16/10

9:20 a.m.-5:35 a.m.

2 stops25h 15m

C$ 1,404
Cheapest one-way

OttawaSouthampton

YOW Ottawa - SOU Southampton Eastleigh

YOWSOU

Ottawa

Fri 9/10

6:50 a.m.-12:05 p.m.

3 stops48h 15m

C$ 440
Quickest one-way

OttawaSouthampton

YOW Ottawa - SOU Southampton Eastleigh

YOWSOU

Ottawa

Tue 6/10

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

3 stops33h 10m

C$ 468

Flights are sorted by cheapest round-trip flights first.

Deals found on 25/8

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

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?

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

  • 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 5 different airlines.

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

    Consider Air Canada (47%), Aegean Airlines (47%) or Austrian Airlines (47%) 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$ 887. While the most popular route (Ottawa - Southampton Eastleigh) can be booked for C$ 1,404 on average, our data indicates C$ 1,231 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

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Top 5 airlines flying from Ottawa to Portsmouth

AirlineCheapestAverageFlexibilityOn-time
Air TransatCheapestC$ 677AverageC$ 804FlexibilityNo cancel feeOn-time50%
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Air FranceCheapestC$ 770AverageC$ 1,284FlexibilityNo cancel feeOn-time77%
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Air CanadaCheapestC$ 885AverageC$ 1,094FlexibilityNo cancel feeOn-time67%
Search Air Canada flights
LufthansaCheapestC$ 911AverageC$ 1,136FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapestC$ 1,193AverageC$ 1,346FlexibilityNo cancel feeOn-time69%
Search United Airlines flights

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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.

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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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