Find cheap flights from Ontario to Seattle

ONT - SEA

Find cheap flights from Ontario to Seattle

Search hundreds of travel sites at once for deals on flights to Seattle from Ontario

Round-trip
Economy
Ontario (ONT)
Seattle/Tacoma Intl
Fri 6/25
Fri 7/2
Any month
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Good to know

Low season

JanuaryBest time to beat the crowds with an average 11% drop in price.

High season

NovemberMost popular time to fly with an average 9% increase in price.

Average price round-trip

$198(avg. price over the last 2 weeks)

Good deal round-trip

$167or less

Good deal one-way

$98or less

When to book flights from Ontario to Seattle

Estimated round-trip price
Average price per month
Flight prices as travel date approaches

Top tips for finding a cheap flight to Seattle from Ontario

  • Looking for a cheap flight? 25% of our users found flights to Seattle from Ontario for $98 or less one-way and $167 or less round-trip.
  • The cheapest flight from Ontario to Seattle was found 50 days before departure, on average.
  • Book at least 2 weeks before departure in order to get a below-average price.
  • High season is considered to be October, November and December. The cheapest month to fly is January.
  • Morning departure is around 5% more expensive than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

FAQs for booking flights from Ontario to Seattle

Which airlines have a flexible cancellation policy for flights from Ontario to Seattle due to COVID-19?

Which airlines apply social distancing measures on flights to Seattle from Ontario due to COVID-19?

How long does a flight from Ontario to Seattle take?

How many flights are there between Ontario and Seattle?

Which airlines provide the cheapest flights from Ontario to Seattle?

Do I need a passport to fly to Seattle from Ontario?

Which airlines fly most frequently between Ontario and Seattle?

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

Which airports will I be using when flying to Seattle from Ontario?

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

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

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

Top 4 airlines serving Ontario to Seattle/Tacoma Intl

Scores according to KAYAK customer reviews

8.3
Alaska Airlines
Overall score based on 29,430 reviews
8.5
Boarding
8.3
Comfort
8.8
Crew
7.9
Entertainment
7.9
Food
Airline reviews

Pros: "Middle seas was open"
Cons: "More social distance during check in. Smoother landing"

Pros: "The person next to me was drunk. The crew was rude."

Cons: "Packed flight but the crew and ground staff opened to back door to board more easily. Thanks!"

Pros: "Crew Polite"
Cons: "More room seats operational didn’t recline"

Pros: "Great experience"
Cons: "Better meal, but great overall."

Pros: "Helped with bags and quick to assist"

Pros: "Crew was very relaxed and friendly."
Cons: "Boarding was actually very good. It’s just the worst part about any flying experience. But they have a great system."

Pros: "Crew was great. Flight was on time."
Cons: "We were not given seat assignments until the flight was about to leave…"

Pros: "Crew was friendly. I loved that I could charge my phone as well as text while in the air (for free)"
Cons: "Delayed by 3 hours with nothing more than a sorry"

Cons: "We will move from our original reserved seats to the last row. Gogo system not operative."

Pros: "Service vas very good. The flight itself was unremarkable. Take-off and landing was smooth and on time."

Pros: "Big seats love the gogo in flight"
Cons: "N/a"

Cons: "Flight was late"

Cons: "The airline knew I was connecting, and they left early. No compensation, last flight of the night."

Pros: "Everything and everyone was awesome"

Pros: "Pasco is just the best little airport! Very clean sand FASSSST security"

Pros: "Serve"
Cons: "No Free Meal"

Pros: "Boarding was a little slow but the overhead bins were a total win! Love the bigger compartment! The seats were comfy and the flight crew were great! Plenty of complimentary drink choices and delicious snacks that could be purchased. Free in flight wifi was awesome and loved being able to charge my tablet at my seat."
Cons: "Needs wider seats, more help with boarding so it could go smoother and faster. More than one passenger struggled to raise the arm rest."

Pros: "Check in was great. Hassle free."
Cons: "Nothing"

Pros: "Very professional and helpful especially Ms Sahar in Ontario airport."

Pros: "Friendly and fun"

Pros: "Arrived on time and in one piece"

Pros: "Ontime"
Cons: "Cramped seats not much room. Kisok to check bags hard to use or did work at all"

Pros: "Nice clean planes"
Cons: "No entertainment monitors"

Pros: "The flight was pleasant. The cabin attendants were cordial and made sure everyone's needs were met. Air temperature was excellent and luckily we didn't have any turbulence."
Cons: "II was hoping to get a $79 fair to Seattle and had to pay three times that plus baggage fee."

Pros: "On time courteous"

Pros: "Fast check-in"

Pros: "The food is really good and excellent vairity"
Cons: "Sometimes the staff is a littls bit impatient"

Pros: "Food I purchased was very good"
Cons: "Food was not priced well. NO WIFI??? WHAT?"

Pros: "The flight left and arrived on time. Overall a great experience with friendly and caring people. Will definitely use them in the near future!"
Cons: "No issues at all"

Cons: "My luggage was ripped open when I picked it up from the baggage claim in Ontario, CA."

Pros: "Good selection of entertainment (movies)."

Cons: "Need more fruit or veggie snack option No movie player option"

Pros: "The trip was smooth and worry free"
Cons: "Everything was great. As a matter of fact, I shared in a couple of recent conversations how much I like Alaska."

Pros: "Sat in Premium. Early board because of wheel chair. Lots of room. Smooth flight. Arrived early in Seattle. Ta very nice. Took all way to car in parking lot. Cleanliness."
Cons: "TA forgot one of my bags at security..but I didn't miss until almost to departure gate. Had to check my medicine bottle of cough syrup. What a pain. Put into separate basket. Open & swab. Weird. I'm 75 not a terrorist but I did have pneumonia recently & needed it do would not cough & choke on plane."

Pros: "Easy, and comfortable."

Pros: "Very friendly staff."

Pros: "Delayed for one day 3 hours waiting time on the phone to reschedule the ticket"

Pros: "The short flight was made especially nice with one flight attendant offering to give a free drink for showing Seattle seahawk pride! Either wearing a jersey or showing a picture with seahawk pride. Very friendly and fun! The views were very beautiful also! Love Alaska airlines and LOVE the seahawks!!"

Pros: "Alaska has always treated us well. I would recommend them anytime."

Pros: "Charging ports were helpful"
Cons: "Flights attendant was rude"

Pros: "The flight home from Ontario CA was better than the flight there. The seating was pretty cramped . We got pretzels which was great. Service at this airport was extremely kind and cheerful. It made traveling with a disabled mother much less stressful. Thank you!!"
Cons: "Paying to check our bags when others got theirs checked for free by taking them to the gate wasn't fair. Having my disabled mother have to walk from the ticket counter to some wheelchair waiting area rather than bringing the chair to her started it trip off with stress we didn't need. I even asked if they could bring it to her and they said just go over to the station and wait."

Pros: "Prompt, fast, efficient, and courteous."

Pros: "The flight itself excellent. Great service The only problem was when we landed there was a traffic jam and could not get to the gate for 20 minutes."

Pros: "Great crew"
Cons: "Food ok"

Pros: "Great customer service very professional look forward to their services in the future"

Pros: "Easy Access"
Cons: "The All of the business in the Ontario airport were closed at 3pm."

Cons: "Bad: The plane from ONT to SEA was very cold and pretty cramped (compared to economy on JetBlue (PDX to LGB)). I think it was on this plane that the seats tilted back about 2 inches. Sleep was impossible."

Pros: "Having outlets and usb plugs available for each seat"

Pros: "Crew was nice"
Cons: "Nothing really"

Cons: "Nothing that I can think of at the moment"

Cons: "The mask mandate needs to be voluntary ADA violation"

Cons: "It was actually quite good, Delta is by far the airline to use compared with the other airlines."

Pros: "Timeliness"
Cons: "Seating"

Cons: "Space on airplanes"

Cons: "The cabin temperature was very hot"

Pros: "Good"

Cons: "Luggage drop was severely understaffed. We had checked in, had boarding passes but there was a 45 minute wait just to drop off a checked bag."

Cons: "Food"

Cons: "Food is always bad."

Pros: "New plane with good features. I was very comfortable."

Pros: "the plane was pretty empty"
Cons: "The times available were terrible!"

Cons: "Nothing"

Cons: "The wrap didn't taste too well."

Cons: "It made no sense to board an hour and a half before takeoff."

Cons: "Change the movies more ofti"

Pros: "the food was really top notch and service was great and friendly"

Cons: "The boarding process at LAX was awful. I’m sure the horrible shuttle wait and transfer from terminal to terminal is the airport’s fault, but the airline did not do anywhere near enough to inform passengers of what was in store. It was confusing and annoying."

Pros: "Easy and on time and Delta Comfort is always the best. Easy boarding process too!"

Pros: "Quick boarding process"
Cons: "Wifi stopped working halfway"

Cons: "Great"

Pros: "Everything was fine. Delta did a great job."
Cons: "The kid screaming in my ear for 3 hours"

Pros: "Total Experience of Flying on this Airline ."
Cons: "No Comment."

Cons: "Cramped seating for premium Econ"

Pros: "It’s was super smooth! Fast service and great customer service."
Cons: "The intercom was a little messed up."

Pros: "It was short and fast."

Pros: "We boarded quickly, in zones. Staff were professional and courteous."
Cons: "Perhaps more than just 2 episodes of some TV programs eg Goldrush. Also more current shows."

Pros: "Loved how close the gates were"
Cons: "Nothing"

Pros: "Great movie selection"

Pros: "Delta did a really good job as always. Cheaper, more comfortable, and a WAY better experience than Alaska Airlines."
Cons: "Nothing."

Pros: "Not much . The boarding process took forever and the lines through TSA took longer .. no direction to lines and I was standing for 10 min before saying something to someone and they said o there’s another line."
Cons: "Almost everything besides the staff on the plane"

Pros: "Kara was really nice to us."
Cons: "Noisy plane."

Cons: "The plane bathroom was old and junky"

Pros: "Movies"
Cons: "Lack of legroom in economy"

Cons: "Food was bad."

Cons: "Poor WiFi. Paid extra to get it, but didnt sporadic at best."

Cons: "Nothing"

Pros: "None of it!! Poor selection"
Cons: "All of it. Again poor selection"

Pros: "Boarding super excellent! Also: Best landing I've ever experienced! Props to the pilot!!"

Cons: "Paid $28 for a Wi-Fi package that didn't work. No refund...."

Cons: "There was a kid screaming on both flights and t was not a good time"

Pros: "Nice and attentive staff, smooth on and off."

Pros: "Boarding was easy"
Cons: "Arrived 15 mins late and then taxied for another 5-10 mins."

Cons: "I was starving because of my short connection time and couldn't have lunch - wanted to eat something solid and they just had boxes with fruits and cheese."

Pros: "I always have a great experience on Delta! Thank you"

Cons: "Snacks if possible"

Cons: "horrible boarding management in SJC."

Pros: "Bags arrived on the belt quickly"
Cons: "Why is there not saying precheck to use after you've been funneled through customs? ATL is advanced enough to have kiosk for arrival, even for those confused and not with global entry, but then forces you to wait in security line instead of the typically faster tea precheck line. Every minute I'm in line, I'm not spending money"

Pros: "Very informative staff"
Cons: "Was late"

Cons: "Friendlier service."

Pros: "Have seatback TV and arrived on-time"
Cons: "Sitting in window seat"

Pros: "Love the ability to watch films on my device by way of United WiFi"
Cons: "Better snacks"

Pros: "Better staff"
Cons: "Still terrible"

Pros: "united is united"

Cons: "If the power outlet works reliably, it would be much better. The toilet was really small."

Pros: "Boarding was well organized."
Cons: "Delayed departure about 20 minutes. No food for a 5 hour trip. (Knew in advance)."

Pros: "The fact that we actually left."
Cons: "Delayed and upset passengers. Bad breath from passengers circulating in the AC. FA we're okay nothing above and beyond."

Pros: "Everything was great except for the food."
Cons: "The hamburger bun was hard as a rock."

Pros: "Every day they take more away from us....the paying customer. ALL major carriers are becoming LCC ( low cost carriers ). Are there no real domestic airlines left. I REALLY miss Continental."
Cons: "I used to enjoy flying. Now I dtead it. There is NOTHING to look forward to. These days you get to pick lhe lesser of all evils. Is there an airline out there that REALLY wants me as a customer???"

Pros: "Ontario airport is so easy and convenient"

Pros: "On time"

Pros: "Service and flighr smooth"

Pros: "Easy, convenient and everyone is nice and accommodating. We always get to SFO under an hour"

Cons: "Delays"

Pros: "I arrived safely."
Cons: "It's a zoo. It's a DIY of checking in and checking your bags in. No staff is around to help. You are on your own. Unorganized."

Cons: "Late late late. Had to run to get my connection. Not Uniteds fault though. SFO too busy. Will avoid in future."

Pros: "The two people that helped."
Cons: "That United had NO remorse for our inconvenience and offered NO compensations."

Pros: "Everyone and everything was great"

Pros: "on time"

Pros: "Delay"
Cons: "Delays"

Cons: "30 min delays on both ends."

Pros: "Que acomoden a las parejas juntas."
Cons: "Asiento incomodo"

Cons: "Staff was not overly friendly and carried few smiles."

Pros: "Not much, except maybe the price."
Cons: "Rude ground staff (air staff were nice). Several delays and not organized at all."

Pros: "Cheap fare"
Cons: "Nothing"

Pros: "Airport not crowded. Efficient boarding!"

Cons: "Staff was rude and it was some what ok"

Pros: "The morning cookie was good."
Cons: "It was dirty."

Pros: "No charging docks on plane as military duffle bag open with clothing hanging out on arrival ~ not sure if anything stolen but the threat is very real and it's unacceptable for military bags to be delivered in that manner"

Cons: "The cabin was too hot."

Pros: "Great service and food"

Cons: "Showed up at airport w 2 15 yr olds traveling alone. We're told we needed to pay $150 each way. We were NOT told when tix were purchased. Accused of lying about the girls ages when we booked. Tix were booked and paid by two different parents and times. Agent relented and waived fee. At the gate we were again challenged and had to go thru it all again. No more United for us!"

Cons: "Confusions on dates from Internet. Your site usually sets its own dates without confirming."

Cons: "delayed"

Cons: "Charge for tv!"

Cons: "Should load the plane from the back rather from the front. People in the back can sort their stuff while still be able to load people into the front."

Cons: "Having to pay for Internet sucks"

Cons: "It was delayed 3hrs!"

Cons: "They lost my suitcase."

Pros: "Same as above statement."
Cons: "Pilot landed the plane a little on the rough side. The Tarmac was definitely felt."

Cons: "N/a"

Cons: "Horrible overlay"

Cons: "My luggage got lost! No water offered!"

Pros: "it was very comfortable"

Cons: "No room in the seating, nor in the overhead."

Pros: "same as above"

Pros: "I would like to have a movie for free"

Pros: "Lining up in groups"
Cons: "Nothing"

Cons: "They crushed my luggage but replaced the carry on after."

Pros: "The crew was reassuring when we were running to board and helped my husband, who had trouble walking."

Pros: "Nothing"
Cons: "Out of the four frontier flights I’ve taken in the past six months each one has been delayed for some reason. First one was over an hour late and caused a majority to miss connecting flights. Today’s experience was not a whole lot different. First leg of the trip was behind schedule, second was delayed at the terminal for the “cleaning” of the aircraft. I will walk to my destination before ever flying with frontier again"

Pros: "Non stop"
Cons: "Seats suck"

Cons: "It’d be nice to have internet access, whether free or for purchase"

Pros: "Early, friendly staff"
Cons: "No WiFi"

Pros: "Boarding was fine ,no food or drink And charge for small carry on luggage $50-I don’t like it"

Cons: "Delays"

Pros: "Getting to Seattle to get away from the airline"

Pros: "They still pick up trash!!"
Cons: "New airbus has even LESS room!! Have to manhandle your personal bag out of the even smaller space under the seat! A soda is $3! There is Nothing to read anymore and the crew are overwhelmed with cranky people... making them cranky."

Pros: "Nothing"
Cons: "No consideration for customers"

Pros: "The same"

Pros: "Nothing"
Cons: "Too many fees"

Pros: "As above."
Cons: "As above"

Pros: "I was last on and only the 1st class was open so free upgrade"
Cons: "No complimentary snacks"

Pros: "fare was good"
Cons: "the seat was terrible"

Pros: "* Good leg room at my seat * Though the check-in line was very long, the curbside check-in attendant was courteous, professional, and very efficient."
Cons: "* Long line for check in * Flight 137 from Denver to Seattle was almost two hours late * seats on airplane don't recline and there is not an adjustable headrest to hold my head in place * The flight attendant wouldn't let me put my paid-for carry-on luggage in the overhead bin above our seats (we were sitting in row 2, seats A,B, C). She said they were reserved for row 1. So I had to place our paid-for carry-on baggage in the overhead bins above row 4. * no movie or even reading material at my seat * No complimentary snack or beverage (only available for purchase). Are you kidding me? I paid extra money for carryons and check-in baggage for all three of us, and my experience on Frontier made me feel like a second class citizen. I doubt I will ever fly with Frontier again."

Cons: "Frontiers prices might look good upon booking but you are charged for everything. $45 extra for a carry-on, $2.95 for a can of soda, etc... cramped seating,"

Pros: "Ticket price"
Cons: "Add on price for everything... carry on by itself $40!! Ridiculous A fee is acceptable, but too high of a fee is ridiculous"

Pros: "Nothing"
Cons: "Everything"

Pros: "Crew was friendly and accommodating but we waited 3+ hours for a pilot that never showed"
Cons: "Crew was friendly and accommodating but we waited 3+ hours for a pilot that never showed"

Pros: "same as above"
Cons: "same as above"

Pros: "Staff was awesome and efficient"
Cons: "Food options, especially since one has to purchase snacks."

Pros: "Staff was friendly."
Cons: "No food or entertainment and nickle and dimed on everything."

Cons: "I felt taken advantage of by the surcharges."

Pros: "Cheap prices"
Cons: "Being stalled on the tarmac for over an hour arriving to Denver. People missing connecting flights. Plane arriving late leaving from Denver to Seattle. No complimentary beverages."

Pros: "speed on check in, age and competent attitude of stewards(esses), clean passenger area."

Pros: "See above."

Cons: "Charge for carry-on bags. Charge for seats. Nickel and dime website trying to upsell you on every screen. Seats don't recline, uncomfortable."

Cons: "Charging for carry ins makes me never want to fly frontier again"

Pros: "Nothing."
Cons: "Everything."

Cons: "Trip had over 8 hours of delays."

Pros: "I DO NOT KNOW WHAT IS GOOD"

Cons: "Very very poor service"

Pros: "Cheap ticket"
Cons: "I felt nickle and dimes for everything"

Pros: "The price"
Cons: "The seats don't recline, the boarding passes didn't scan anywhere we tried to scan into."

Pros: "The announcement (although I didn't take them up on it) to offer two domestic round trips if I'd sign up for one of their Mastercards. It's probably not a bad deal for someone who likes to have lots of credit cards and doesn't mind annual fees, I'm just not one of those people."
Cons: "My inability to access their e-mail offers to set things up ahead of time and at lower costs than paying them at the airport check-in, above and beyond the baggage charges themselves (Seventy bucks), especially for my carry on ... COME ON! I've become used to Southwest's far more enlightened policies, which I obviously prefer. Since it also has flights between Seattle and Denver, I'll look much more closely at staying with them the next time I make this trip."

Pros: "Airbus jet was nice. Frontier credit card sign-up was offered."

Cons: "The fees for seat assignments and carry on luggage. Frontier also does not accept TSA Pre-check."

Pros: "speedy, safe, and friendly"
Cons: "no complimentary drink or snack. seats where uncomfortable"

Cons: "delays with NO feedback"

Cons: "They nickle and dime you to death. They even charge you for soda!"

Pros: "Nothing, never use them again EVER"
Cons: "NOTHING0 ZILCH"

Pros: "Letting me in though I got a bit late to the gate, due to unexpectedly log TSA lined"

Cons: "Paying for seat AND baggage is reason to fly Southwest."

Pros: "same as above"
Cons: "same as above"

Pros: "See cooment above"
Cons: "See comments above"

Cons: "My name was not correct on return email documents. When I tried to correct on-line, the program asked for another $139. When I phoned the number listed, I had a gentleman whose English was very hard to understand. He ended up telling me not to worry about the error-it would not cause a problem. I ended up phoning a 2nd time, to another person to assure that nothing would go wrong at boarding time."

Pros: ".It was a very confortable flight and right on time.."

Cons: "Finding that getting a seat costs extra"

Cons: "My mother did not get one of her bag back when we arrived in Seattle"

Read more about Alaska Airlines
COVID-19 information

Safety measures for airlines flying from Ontario to Seattle

Airlines flying from Ontario to Seattle have enacted additional safety measures and adjusted policies to better accommodate travelers. Policies vary by airline.

Heightened sanitation

Daily cleaning, installation of cabin HEPA filters on flights from Ontario to Seattle

Mandatory masks

Masks required on board, masks provided on flights from Ontario to Seattle

Social distancing seating

Middle seats unavailable to book on flights from Ontario to Seattle

Pre-flight testing

Testing for antibodies, testing for symptoms for flights from Ontario to Seattle

Book cheap flights from Ontario to Seattle

Recent round-trip flight deals

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