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Cheap flights from Ottawa to Washington from $129

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Ottawa to Washington departing on 9/29. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Cheap round-trip flights

WestJet Logo
3:35 pm - 8:29 pmYOW-SEA
7h 54m1 stop
WestJet Logo
8:40 am - 12:22 amSEA-YOW
12h 42m2 stops
$230WestJet
Find Deal
Mon, Sep 29 - Thu, Oct 2
United Airlines Logo
5:15 am - 10:59 amYOW-SEA
8h 44m1 stop
United Airlines Logo
6:00 am - 10:05 pmSEA-YOW
13h 05m1 stop
$251United Airlines
Find Deal
Thu, Oct 2 - Sat, Oct 11
WestJet Logo
7:15 pm - 12:35 pmYOW-SEA
20h 20m2 stops
WestJet Logo
1:50 pm - 12:40 amSEA-YOW
7h 50m1 stop
$253WestJet
Find Deal
Sat, Oct 11 - Wed, Oct 22
United Airlines Logo
2:45 pm - 8:44 pmYOW-SEA
8h 59m1 stop
United Airlines Logo
7:00 am - 5:06 pmSEA-YOW
7h 06m1 stop
$254United Airlines
Find Deal
Sat, Oct 11 - Wed, Oct 22
United Airlines Logo
6:33 am - 4:20 pmYOW-SEA
12h 47m2 stops
United Airlines Logo
7:37 pm - 2:04 pmSEA-YOW
15h 27m2 stops
$255United Airlines
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Tue, Sep 30 - Tue, Sep 30
WestJet Logo
7:15 pm - 12:35 pmYOW-SEA
20h 20m2 stops
WestJet Logo
8:40 am - 12:22 amSEA-YOW
12h 42m2 stops
$258WestJet
Find Deal
Sat, Oct 11 - Wed, Oct 22
WestJet Logo
3:35 pm - 8:29 pmYOW-SEA
7h 54m1 stop
WestJet Logo
8:40 am - 6:45 amSEA-YOW
19h 05m1 stop
$259WestJet
Find Deal
Mon, Sep 29 - Wed, Oct 1
United Airlines Logo
10:37 am - 11:15 pmYOW-SEA
15h 38m2 stops
United Airlines Logo
6:55 pm - 9:58 amSEA-YOW
12h 03m2 stops
$260United Airlines
Find Deal
Tue, Sep 30 - Fri, Oct 3
Air Canada Logo
6:00 pm - 11:01 pmYOW-PDX
8h 01m1 stop
Air Canada Logo
6:15 am - 4:12 pmPDX-YOW
6h 57m1 stop
$265Air Canada
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Tue, Oct 7 - Sun, Oct 12
Air Canada Logo
5:15 am - 10:59 amYOW-SEA
8h 44m1 stop
Air Canada Logo
5:30 am - 7:29 pmSEA-YOW
10h 59m2 stops
$304Air Canada
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Mon, Sep 29 - Fri, Oct 3

WestJet flights from Ottawa to State of Washington

Our best WestJet deals on Ottawa to State of Washington flight tickets
WestJet
Sep 29
YOW3:35 pmOttawa
7h 54m
1 stop
SEA8:29 pmSeattle/Tacoma Intl
Oct 2
SEA8:40 amSeattle/Tacoma Intl
12h 42m
2 stops
YOW12:22 amOttawa
$230
Find similar
WestJet
Oct 11
YOW7:15 pmOttawa
20h 20m
2 stops
SEA12:35 pmSeattle/Tacoma Intl
Oct 22
SEA1:50 pmSeattle/Tacoma Intl
7h 50m
1 stop
YOW12:40 amOttawa
$253
Find similar
WestJet
Oct 11
YOW7:15 pmOttawa
20h 20m
2 stops
SEA12:35 pmSeattle/Tacoma Intl
Oct 22
SEA8:40 amSeattle/Tacoma Intl
12h 42m
2 stops
YOW12:22 amOttawa
$258
Find similar

United Airlines flights from Ottawa to State of Washington

Our best United Airlines deals on Ottawa to State of Washington flight tickets
United Airlines
Oct 2
YOW5:15 amOttawa
8h 44m
1 stop
SEA10:59 amSeattle/Tacoma Intl
Oct 11
SEA6:00 amSeattle/Tacoma Intl
13h 05m
1 stop
YOW10:05 pmOttawa
$251
Find similar
United Airlines
Oct 11
YOW2:45 pmOttawa
8h 59m
1 stop
SEA8:44 pmSeattle/Tacoma Intl
Oct 22
SEA7:00 amSeattle/Tacoma Intl
7h 06m
1 stop
YOW5:06 pmOttawa
$254
Find similar
United Airlines
Sep 30
YOW6:33 amOttawa
12h 47m
2 stops
SEA4:20 pmSeattle/Tacoma Intl
Sep 30
SEA7:37 pmSeattle/Tacoma Intl
15h 27m
2 stops
YOW2:04 pmOttawa
$255
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Ottawa to State of Washington 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, momondo users made 832,500 searches. Data last updated September 16, 2025.
Use the filters below to find and compare flights from Ottawa to Washington that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/29

3:35 pm-8:29 pm

1 stop7h 54m

Seattle/Tacoma Intl

Thu 10/2

8:40 am-12:22 am

2 stops12h 42m

$230

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Thu 10/2

5:15 am-10:59 am

1 stop8h 44m

Seattle/Tacoma Intl

Sat 10/11

6:00 am-10:05 pm

1 stop13h 05m

$251

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 10/11

7:15 pm-12:35 pm

2 stops20h 20m

Seattle/Tacoma Intl

Wed 10/22

1:50 pm-12:40 am

1 stop7h 50m

$253

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 10/11

2:45 pm-8:44 pm

1 stop8h 59m

Seattle/Tacoma Intl

Wed 10/22

7:00 am-5:06 pm

1 stop7h 06m

$254

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 9/30

6:33 am-4:20 pm

2 stops12h 47m

Seattle/Tacoma Intl

Tue 9/30

7:37 pm-2:04 pm

2 stops15h 27m

$255

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Sat 10/11

7:15 pm-12:35 pm

2 stops20h 20m

Seattle/Tacoma Intl

Wed 10/22

8:40 am-12:22 am

2 stops12h 42m

$258

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/29

3:35 pm-8:29 pm

1 stop7h 54m

Seattle/Tacoma Intl

Wed 10/1

8:40 am-6:45 am

1 stop19h 05m

$259

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Tue 9/30

10:37 am-11:15 pm

2 stops15h 38m

Seattle/Tacoma Intl

Fri 10/3

6:55 pm-9:58 am

2 stops12h 03m

$260

OttawaPortland

YOW - PDX

YOWPDX

Ottawa

Tue 10/7

6:00 pm-11:01 pm

1 stop8h 01m

Portland

Sun 10/12

6:15 am-4:12 pm

1 stop6h 57m

$265

OttawaSeattle

YOW - SEA

YOWSEA

Ottawa

Mon 9/29

5:15 am-10:59 am

1 stop8h 44m

Seattle/Tacoma Intl

Fri 10/3

5:30 am-7:29 pm

2 stops10h 59m

$304

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Washington from

How to get the cheapest flight ticket from Ottawa to State of Washington

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to State of Washington?

The month of September is, on average, the cheapest month to fly to State of Washington from Ottawa, with most prices found around $363. If you aren’t able to travel to State of Washington during the month of September, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $409.

What is the cheapest day to depart on your flight to State of Washington?

The cheapest day to depart from Ottawa to State of Washington is on a Saturday. Travelers who choose to depart for State of Washington on a Saturday will often find tickets for as low as $422. When flying out on a Monday, the most expensive travel day of the week, you can expect to see flight prices from Ottawa to State of Washington for around $577.

What is the cheapest time of day to depart on your flight to State of Washington?

The cheapest time of day to fly to State of Washington is in the evening when flights can be purchased for as low as $433. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $597 on average. Flights to State of Washington from Ottawa at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

How far in advance should I book a flight to State of Washington?

You are more likely to see cheaper flights to State of Washington from Ottawa when booking weeks ahead of your departure date. In general, you can expect to find flights to State of Washington for around $428 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to State of Washington from Ottawa for as low as $309 on momondo.

Can stopping save me money on Ottawa to State of Washington flights?

You could potentially save up to 37% on your flight if you consider stops on a Ottawa to State of Washington flight.

Cheap Ottawa to State of Washington flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Ottawa to State of Washington

Direct flights

None
There are no direct flights from Ottawa to State of Washington. There are no popular flight routes from Ottawa to State of Washington.
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  • When did momondo last update prices for flights from Ottawa Airport to Washington?

    Prices for flights from Ottawa Airport to Washington were last updated today.

  • How many operators does momondo search for flights from Ottawa Airport to Washington?

  • How old do you have to be to fly from Ottawa Airport to Washington?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Ottawa Airport to Washington.

  • What documentation or ID do you need to fly to Washington?

    The necessary travel and health documents for your Washington trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Ottawa to State of Washington

Compare and see reviews for airlines that fly from Ottawa to State of Washington with momondo
Airline
Rating
Free Cancellation
Price
WestJetPriceFrom $277Free CancellationRating
7.2
3,093 reviews
Search WestJet flights
Air CanadaPriceFrom $304Free CancellationRating
7.1
10,000 reviews
Search Air Canada flights
United AirlinesPriceFrom $361Free CancellationRating
7.4
8,924 reviews
Search United Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Ottawa to Washington?

Finding the right flight to Washington from Ottawa is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Washington quick and easy, saving you time and money.

Can I find flights from Ottawa to Washington with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Ottawa to Washington flights to just show those with flexible booking policies.

How can momondo help me find flights from Ottawa to Washington?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington from Ottawa.

I’m not ready to book a flight from Ottawa to Washington right now. Can momondo alert me if prices change?

Price alerts on flights to Washington from Ottawa are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

An easier way to manage your State of Washington trip

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