$88 Find Cheap Flights from Ontario to Washington - Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to Washington departing on 8/19. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
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1 adult, Economy, 0 bags

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Cheap Flights from Ontario to Washington

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours
Seattle
Seattle1 stop$212
Spokane
Spokane1 stop$258
Pasco
Pasco1 stop$249
Bellingham
Bellingham1 stop$308
Pullman
Pullman1 stop$333
Wenatchee
Wenatchee1 stop$360
Walla Walla
Walla Walla1 stop$351
Seattle
Seattle1 stop$212
Spokane
Spokane1 stop$258
Pasco
Pasco1 stop$249
Bellingham
Bellingham1 stop$308
Pullman
Pullman1 stop$333
Wenatchee
Wenatchee1 stop$360
Walla Walla
Walla Walla1 stop$351

Book Cheap Ontario to Washington Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Ontario to Washington that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Ontario to Washington

Thu, Sep 17 - Mon, Sep 21
Frontier Logo
11:16 am - 5:45 pm
ONT
-
SEA
6h 29m
1 stop
Frontier Logo
11:15 am - 2:03 pm
SEA
-
ONT
2h 48mnonstop
$212Frontier
Thu, Aug 20 - Mon, Aug 24
Frontier Logo
6:00 am - 1:22 pm
ONT
-
SEA
7h 22m
1 stop
Frontier Logo
11:54 am - 2:45 pm
SEA
-
ONT
2h 51mnonstop
$213Frontier
Tue, Aug 11 - Wed, Aug 19
Delta Logo
11:56 am - 7:44 pm
ONT
-
PDX
7h 48m
1 stop
Delta Logo
5:08 pm - 11:34 pm
PDX
-
ONT
6h 26m
1 stop
$247Delta
Thu, Aug 13 - Mon, Aug 17
Multiple Airlines Logo
4:09 pm - 8:11 pm
ONT
-
PSC
28h 02m
1 stop
Multiple Airlines Logo
9:01 pm - 3:54 pm
PSC
-
ONT
18h 53m
1 stop
$249Multiple Airlines
Sat, Aug 8 - Wed, Aug 12
Southwest Logo
11:00 am - 6:20 pm
ONT
-
PDX
7h 20m
2 stops
Southwest Logo
7:05 am - 2:05 pm
PDX
-
ONT
7h 00m
1 stop
$252Southwest
Tue, Aug 11 - Wed, Aug 19
Southwest Logo
11:10 am - 3:05 pm
ONT
-
GEG
3h 55m
1 stop
Southwest Logo
5:45 am - 10:15 am
GEG
-
ONT
4h 30m
1 stop
$258Southwest
Tue, Aug 11 - Tue, Aug 25
Alaska Airlines Logo
12:04 pm - 7:00 pm
ONT
-
GEG
6h 56m
1 stop
Alaska Airlines Logo
12:49 pm - 8:24 pm
GEG
-
ONT
7h 35m
1 stop
$261Alaska Airlines
Thu, Aug 6 - Tue, Aug 11
Alaska Airlines Logo
5:26 pm - 10:36 pm
ONT
-
GEG
5h 10m
1 stop
Alaska Airlines Logo
6:13 am - 11:14 am
GEG
-
ONT
5h 01m
1 stop
$268Alaska Airlines
Fri, Sep 11 - Sun, Sep 13
Multiple Airlines Logo
11:16 am - 8:12 pm
ONT
-
BLI
8h 56m
1 stop
Multiple Airlines Logo
4:59 pm - 8:54 pm
BLI
-
ONT
27h 55m
1 stop
$308Multiple Airlines
Sat, Sep 19 - Tue, Sep 22
Delta Logo
6:00 pm - 10:44 pm
ONT
-
PSC
4h 44m
1 stop
Delta Logo
5:23 pm - 11:47 pm
PSC
-
ONT
6h 24m
1 stop
$311Delta
Booking Insights

KAYAK's insights & trends for Ontario to Washington flights

Get data-powered insights and trends into flights from Ontario to Washington to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Ontario to State of Washington?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Ontario to State of Washington departing in September.

What is the cheapest Ontario to Washington flight route?

Data is based on round-trip flight searches on KAYAK over the past month.

The cheapest ticket to Washington from Ontario found in the last 5 days was to Seattle, at $216 round-trip. The most popular route is from Ontario (ONT) to Seattle (SEA), and the cheapest round-trip airline ticket found on this route in the last 5 days was $216.

What is the cheapest time of day to fly to Washington?

The average price for all round-trip flights from Ontario to Washington depending on the time of departure, clicked by users on KAYAK in the last 2 weeks.

The cheapest time of day to fly to Washington is generally in the evening, when round-trip flights cost $270 on average. Morning departures are around 20% more expensive than evening flights, on average. The most expensive time of day to fly to Washington is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $321.

Can I save money by flying with a layover from Ontario to Washington?

The average round-trip price for all non-stop flights, flights with one layover, and flights with two layovers for the route found by users searching on KAYAK in the last 2 weeks.

No, with an average price for the route of $328, prices are generally cheapest when you fly direct.

What is the cheapest month to fly from Ontario to Washington?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to Washington, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Ontario to Washington is October, when tickets cost $37 (return) on average. On the other hand, the most expensive months are November and June, when the average cost of round-trip tickets is $567 and $398 respectively.

What’s the cheapest day of the week to fly from Ontario to Washington?

The average price of all round-trip flights from Ontario to Washington clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Washington on a Saturday and more expensive on a Wednesday. On your return trip to Ontario, you should consider flying back on a Thursday, and avoid Sundays for better deals.

How far in advance should I book a flight from Ontario to Washington?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to Washington, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.

To get a below average price on the flight from Ontario to Washington, you should book around 3 weeks before departure, which saves you about 24% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 6 weeks before departure.

Good to know

Low seasonFebruary
Cheapest flight$88
Best time to beat the crowds with an average 11% drop in price.
Most popular time to fly and prices are also 1% lower on average.
Flight from Ontario to Portland

FAQs - booking Washington flights

  • How does KAYAK find such low prices on flights from Ontario to Washington?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Ontario to Washington.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Ontario to Washington?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to Washington is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Ontario to Washington?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Ontario to Washington with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Ontario to Washington?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Ontario to Washington up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top tips for finding cheap flights to Washington

  • Looking for a cheap flight? 25% of our users found tickets from Ontario to the following destinations at these prices or less: Portland $209 one-way - $328 round-trip; Seattle $193 one-way - $290 round-trip

Reviews of the top 5 airlines serving from Ontario to Washington

 
See real verified KAYAK customer reviews for airlines flying from Ontario to Washington. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Ontario to Washington? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.9
Alaska AirlinesOverall score based on 12634 reviews
7.0Food
8.1Boarding
7.0Entertainment
7.8Comfort
8.5Crew
Airline reviews

The seat on row 11 was a little hard cause my butt was hurting a little bit from sitting after and hour.

8.0 Excellentola, Jul 2026
ONT - SEA
Read more Alaska Airlines reviews

The seat on row 11 was a little hard cause my butt was hurting a little bit from sitting after and hour.

The first flight was fine, great crew, but the plane was delayed 45 minutes to go to Seattle because of they were missing a ramp. That would make sense if the plane was actually at the gate. Not if we’re still waiting for a plane. After we landed we waited 30-45 minutes on the tarmac just to get off the plane. Alaska made me miss my connecting flight, wasting my time, and my money. I should honestly be reimbursed, but hey, when does the airline ever actually take accountability? Never.

It was ok! Not fond of sitting in middle seat. Tried to upgrade with my Atmos card but it was a new account and they weren’t able to look up my account details.

There is no entertainment on the plane. The snack is minimal. The crew was nice and professional.

Overall it was good. There was a delay in departure, which is why I did not rate it as excellent.

First time flying with any airline that has decent seating. Great experience crew was friendly and the pilot was as well.

Didn’t like anything. Alaska boarding process takes too long and is poorly managed. Flight crew unorganized and too lax not very professional. I fly very frequently (weekly) and this as the worst overall trip I have ever taken.

Nothing! I just didn't eat or use entertainment. I had three seats all to myself and it was wonderful!!!!

I don't know what it is. But it seems that flights from Ontario to Seattle are always delayed. This one was delayed 3 hours. I guess I should just expect it from now on.

Connection in Seattle was almost a disaster. Departure gate was changed but Departure display was never updated. Quite a few people were waiting at the original gate and had to run to new gate after it was discovered online. Display never updated.

Flight was delayed, full flight and I had to change gates. Southwest flights are always late later in the day.

Paid for premium extra leg room but the bin space for rows 1-3 had to go in rows 4-6 and 4-6 had to go to 7-9 because flight attendants have snacks and their luggage upfront. So we pay extra to have to fight thru traffic to get our bags. Only 2nd day of new seating so hope they fix this.

Delayed flight. Nicest crew member was a SW pilot flying seated next to me who kindly move to seat the final passenger. Flight extra delayed. My cup of refreshment of ginger ale was so packed with ice it was literally 2 sips.

Southwest is Southwest. No frills. If you're luck enough to get a happy crew (we did), then it makes for a nicer flight.

I would have liked to arrive on time - not 5 hours late!

Board Milian spokesman with pre boarding , not after A group and without my spouse. Total BS, back to Alaska Airlibes I GO. oner 1.2M miles and 900 flights, and every time I fly SWA I regret it, thos will be last time, I only flew SWA but to time requirements fir a Funeral. NEVER AGAIN SWA

Good crew, funny movies, but you need phone ports in the plane and better snacks. :)

Had a long layover in rainy Chicago. The staff were attentive - my husband needed a wheelchair due to a recent fall and unsteady on his feet. They are wonderful for those of us who need a bit of extra care. My only complaint was discovered upon unpacking our suitcases at home. One (we had 3 carry on size and one just a bit larger) had water damage to everything inside. All the clothing (just happened to be the case with the clean clothes) were wet. I know it was raining, but why would items inside be wet? The paperwork packed in this case was damp with ink running. There were momentos from our 10-day European vacation that I was hoping to scrapbook - but alas, they will be scrapped - too damaged to keep. The boxes of French chocolate were damp on the outside. My expensive camera now has a cracked screen and a Gaudi tea-for-one was cracked - even though it was packed in clothing. I know it happened on this flight as I repacked all four suitcases before leaving New York in the morning. My first unhappy experience with luggage at Southwest.

I liked receiving attention from aged and well experienced flight attendants. I disliked the non-gluten-free snack but I brought my own so I was OK.

The a/c wasn’t working very well and it was a very hot flight

Checkin was good, fllight ws good. Onlly complaint is lack of foot on 6 hour flight from Seattle to Boston. Snacks were flimsy - chips and cookies. could have offered something more substantial for such a long flight. I know you can buy food in airport but for the price you pay for a ticket, they should step up for the passengers.

Flight delayed for two and half hours and then canceled altogether due to mechanical issues. No mechanic onsite to fix so had to send one from LAX.

It was a great flight and the stewards and stewardess were all kind and accommodating!! The seats were comfortable and entertainment screen excellent!

There was a security issue at the airport and we were unable to land. We circled endlessly and then landed at another airfield for fuel. We then circled the airport again, almost landed but didn’t fully touch down before circling again. I am thankful to the crew for keeping us safe- the issue was the airline and staff at the airport getting us seats on our connecting flights. That part was hours of searching for someone and getting in double my steps.

737-800 in first class was pretty dumpy. Seat had an uncomfortable angle, storage under the seat was blocked so even my very modest backpack didn't fit, power outlet was flaky. Weird tiny seat pockets that couldn't hold a gallon ziploc bag, emesis bag missing, etc. etc. No in-flight service due to turbulence. Crew was excellent, boarding was smooth despite a full flight.

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Plane was turned around due to fog half way into the flight, Delta did not properly direct passengers to stay on same flight and instead failed to properly rebook on Alaska

The flight was overbooked and the staff at the gate started calling for volunteers to drop out and offering incentives. That delayed the flight

There was no wifi even after my husband paid for wifi it wasn’t working. The plane looked and felt old.

Update the cabin with tv screens or at least music sources.

Yall need to integrate your system with Alaska more efficiently. They booted me off the first flight because of a discrepancy on your end.

Unfortunately, I was put into the middle seat in the first row of premium seating. Sounds nice right? No! that is the worst seat in the plane. I wish I was in economy rather than be in that seat! There is no seat back pocket, no tray table, no charger. Nothing! so unless you're row mates are willing to let you share their basic amenities any flyer should have, you are stuck. It was the worst experience ever! And the flight attendant forgot to take my drink order. I felt like the forgotten flyer.

It was pretty good except there was no food, which was understandable because it was a short flight but I would have liked to at least have a snack; otherwise it was great. Staff/crew, great. Thank you

Everything was good for the price I paid. Crew was very nice.

I was put in seat 6B with no warning. Had no seat in front of me just sticks out in the aisle so I had to hold what I could and put the rest in a bin way further down.

I was booked thru Hawaiian Airlines (HA) on Kayak in February. I got 2 confirmation emails from Hawaiian Airlines in February. Even though the flight ticket informed me the flight was marketed thru HA and operated by Alaska Airlines (AA), I was never given any confirmation codes or anything from Kayak or AA to check into my flight online ahead of time. They also couldn't find the HA flight number I was given on their website and was told my flight did not exist unless I searched thru the AA website for flight details that was similar to the info HA gave me. The only way to check into my flight and make sure the flight still existed required me to get there 4 hours early. When I arrived at the airport, HA desk told me to go to AA desk. First AA desk redirected me to another desk, second AA desk told me to find someone with an iPad, and finally the iPad rep was able to help me. I also had to chat with AA reps online the night previous to my return trip because the same issue occurred.

There were several delays and we were stressed about making our connection. The announcements for boarding were hard to hear or understand. The seating was uncomfortable for a 6 hour flight.

The seating was very cramped. The selection of movies was poor.

They did not let me check in . Said I was 4 mins late.

I noticed the flight attendants had a bit of attitude towards guests. Not sure why but they were a little moody. They tossed earphones at me and to pass to the person next to me. I think the same flight attendant kinda got upset at a man for putting his cup in the trash area on the cart (I think he was trying to help but perhaps placed it in a diff waste area). The flight attendant was not happy and snapped a little

Remind customers of the need to have passport or new ID for boarding.

The takeoff was the smoothest I've ever experienced on any airline and this is the first time I've flown on frontier so this was an extremely pleasant surprise!

A lady asked to stop the flight after the tunnel pulled away and we began to depart a flight that was already hours late. The attendance respectfully stopped the the plane and had the tunnel return. After the tunnel returned the passenger claimed to have changed her mind . The tunnel was then put in reverse and the passenger remained on the plane .. They should have sent the sick passenger off the plane like initially replaced. They existed a couple off the plane prior to that situation.. So.. all and all.. it was a long and flight.. .

We understand and comply with Frontier’s bag sizes. We’ve had some problems in past while having to await other passengers who do not understand the baggage restrictions or have not prepaid and that is usually our biggest concern (others delaying us) with flying Frontier. Flying OUT of ONT, however, has always been a great experience. I’ve also noted even on delayed Frontier flights very knowledgeable pilots who manage expectations well.

Long lines, rude staff, everything that's offered you have to pay for.

The last time I flew Frontier was in the 1960s when it was a “real” airline. We flew this time because of the price & schedule. As the saying goes, you get what you pay for.

I appreciated the upgrade to free cary-on bag and seat selection at no charge

Flight was delayed on the runway for 40 minutes the crew did not even offer even water to passengers to compensate for the flight delayed. The flight was delayed due to aircraft mechanical issues. Worst customer service ever

This isna terribly run airlines. If you're one minute late, they will deny your ticket. Don't waste your time or money

Flight was delayed for more than 3 hours, crew at ONT airport was rude, and when we got to DFW the airplane had an issue landing, we had to be taxied to the terminal, and the luggage was hold until the next day.

Everything you need to know for your flight from Ontario to Washington

Information on your arrival and departure airports