Ontario (ONT) to Seattle (SEA) Flights from ₹7,475
Fares on this route currently start from ₹7,475. Compare live ONT to SEA prices, non-stop and connecting flights, departure times and airline choices before booking. Use the search panel to change origin, destination, passengers, cabin and trip type instantly.
ONT → SEAApprox. 1540.37 km04 Jun 2026Live inventory
✈ Flight Search
Modify your route
From
To
Depart
Return
Adults
Children
Infants
Cabin
Trip Type
ONT→SEA
Sort By
💰 Cheapest
⚡ Fastest
🕐 Earliest
🎚️ Filters
Stops Reset
0
0
0
Max Price Reset
Up to ₹5,00,000
Departure Time Reset
🌙 Night 12am–6am
🌅 Morning 6am–12pm
☀️ Afternoon 12pm–6pm
🌆 Evening 6pm–12am
Fare Type
Airlines All
Loading…
Select Fare
—
—
per person · incl. taxes
Stops Reset
0
0
0
Max Price Reset
Up to ₹5,00,000
Departure Time Reset
🌙 Night 12am–6am
🌅 Morning 6am–12pm
☀️ Afternoon 12pm–6pm
🌆 Evening 6pm–12am
Fare Type
Airlines All
Loading…
Showing 25
of 184
live flights
Frontier Airlines
F9-2275
16:04
06/04/2026
ONT
Ontario International Airport
3h 1m
Non-stop
19:05
06/04/2026
SEA
Seattle Tacoma International Airport
₹7,475
per person
✕ Non-refundable
Southwest Airlines
WN-3164
18:35
06/04/2026
ONT
Ontario International Airport
5h 30m
1 Stop
⏱ SJC · 2h 10mSJC Airport
00:05
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹11,700
per person
✕ Non-refundable🔥 Last 2 seats5 fare options
Southwest Airlines
WN-3151
12:40
06/04/2026
ONT
Ontario International Airport
7h 30m
1 Stop
⏱ LAS · 3h 40mLAS Airport
20:10
06/04/2026
SEA
Seattle Tacoma International Airport
₹11,700
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-670
15:40
06/04/2026
ONT
Ontario International Airport
5h 20m
1 Stop
⏱ SMF · 1h 55mSMF Airport
21:00
06/04/2026
SEA
Seattle Tacoma International Airport
₹11,700
per person
✕ Non-refundable🔥 Last 5 seats5 fare options
Southwest Airlines
WN-2298
13:20
06/04/2026
ONT
Ontario International Airport
7h 40m
1 Stop
⏱ SMF · 4h 20mSMF Airport
21:00
06/04/2026
SEA
Seattle Tacoma International Airport
₹11,933
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-3840
13:35
06/04/2026
ONT
Ontario International Airport
2h 58m
Non-stop
16:33
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable7 fare options
Delta Air Lines
DL-4031
17:50
06/04/2026
ONT
Ontario International Airport
3h 0m
Non-stop
20:50
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable7 fare options
Delta Air Lines
DL-4070
11:52
06/04/2026
ONT
Ontario International Airport
3h 1m
Non-stop
14:53
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable7 fare options
Delta Air Lines
DL-2640
17:40
06/04/2026
LAX
Ontario International Airport
2h 48m
Non-stop
20:28
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-2616
21:05
06/04/2026
LAX
Ontario International Airport
2h 48m
Non-stop
23:53
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-1045
12:12
06/04/2026
LAX
Ontario International Airport
2h 53m
Non-stop
15:05
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-1714
09:25
06/04/2026
LAX
Ontario International Airport
2h 56m
Non-stop
12:21
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable5 fare options
Delta Air Lines
DL-1551
19:59
06/04/2026
LAX
Ontario International Airport
2h 56m
Non-stop
22:55
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,180
per person
✕ Non-refundable5 fare options
Southwest Airlines
WN-2435
19:55
06/04/2026
LAX
Ontario International Airport
4h 10m
1 Stop
⏱ SJC · 0h 45mSJC Airport
00:05
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹13,228
per person
✓ Refundable🔥 Last 2 seats4 fare options
alaskaairlines
AS-625
16:03
06/04/2026
ONT
Ontario International Airport
2h 49m
Non-stop
18:52
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,387
per person
✕ Non-refundable11 fare options
alaskaairlines
AS-592
19:41
06/04/2026
ONT
Ontario International Airport
2h 49m
Non-stop
22:30
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,387
per person
✕ Non-refundable11 fare options
Delta Air Lines
DL-2318
18:51
06/04/2026
SNA
Ontario International Airport
3h 4m
Non-stop
21:55
06/04/2026
SEA
Seattle Tacoma International Airport
₹13,653
per person
✕ Non-refundable5 fare options
Frontier Airlines
F9-1500
06:00
06/04/2026
ONT
Ontario International Airport
28h 6m
1 Stop
⏱ DEN · 22h 38mDEN Airport
10:06
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹13,733
per person
✕ Non-refundable🔥 Last 4 seats
Frontier Airlines
F9-2908
10:50
06/04/2026
ONT
Ontario International Airport
23h 16m
1 Stop
⏱ DEN · 17h 48mDEN Airport
10:06
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹13,792
per person
✕ Non-refundable🔥 Last 4 seats
Frontier Airlines
F9-4758
15:30
06/04/2026
ONT
Ontario International Airport
19h 6m
1 Stop
⏱ LAS · 15h 1mLAS Airport
10:36
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹13,793
per person
✕ Non-refundable
Frontier Airlines
F9-2232
11:51
06/04/2026
ONT
Ontario International Airport
22h 45m
1 Stop
⏱ LAS · 18h 42mLAS Airport
10:36
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹13,793
per person
✕ Non-refundable
United Airlines
UA-325
11:43
06/04/2026
LAX
Ontario International Airport
2h 53m
Non-stop
14:36
06/04/2026
SEA
Seattle Tacoma International Airport
₹14,131
per person
✕ Non-refundable🔥 Last 2 seats15 fare options
United Airlines
UA-684
19:15
06/04/2026
LAX
Ontario International Airport
2h 53m
Non-stop
22:08
06/04/2026
SEA
Seattle Tacoma International Airport
₹14,131
per person
✕ Non-refundable14 fare options
Southwest Airlines
WN-3160
20:50
06/04/2026
ONT
Ontario International Airport
4h 50m
1 Stop
⏱ PHX · 0h 40mPHX Airport
01:40
06/05/2026
+1
SEA
Seattle Tacoma International Airport
₹14,577
per person
✕ Non-refundable🔥 Last 1 seats5 fare options
Southwest Airlines
WN-3162
10:50
06/04/2026
ONT
Ontario International Airport
5h 30m
1 Stop
⏱ SJC · 2h 10mSJC Airport
16:20
06/04/2026
SEA
Seattle Tacoma International Airport
₹14,577
per person
✕ Non-refundable5 fare options
😕 No flights match your filters.
Ontario (ONT)
📍 Ontario International Airport
🌍 United States
🕐 GMT -8
📐 Latitude: 34.055999755859375
📐 Longitude: -117.60099792480469
Seattle (SEA)
📍 Seattle Tacoma International Airport
🌍 United States
🕐 GMT -8
📐 Latitude: 47.449001
📐 Longitude: -122.308998
✈ Distance: Ontario,USA to Seattle,USA — 1540.37 km
📅 Results on this page are loaded for 04 Jun 2026. Click View all flights for the complete live search.
Ontario to Seattle — what to expect when booking
The ONT–SEA route is served by multiple carriers throughout the year.
Fares on this route can move quickly — a price available now may not be there 30 minutes later.
If your dates are flexible, try shifting your departure by a day or two using the date strip above.
Mid-week departures often show lower base fares compared to weekend starts on many routes.
The distance between Ontario,USA and Seattle,USA is approximately
1540.37 km.
Before you book
Compare nearby dates
The date strip above lets you scan nearby fares without restarting the search.
Open full search for more control
Route page shows a limited live set. Full search opens the complete inventory with fresh results.
Check fare details
Each result shows baggage, refundability and fare details before you proceed.
❓ Frequently asked questions — Ontario to Seattle flights
Generally yes — fares on most routes are most competitive around 4–6 weeks before departure. Booking earlier usually means better availability and a lower base fare when your dates are fixed.
The straight-line distance between Ontario,USA (ONT) and Seattle,USA (SEA) is approximately 1540.37 km. Actual flying distance may vary slightly depending on routing.
Non-stop availability on this route varies by airline schedule and season. Use the filters below to quickly check whether direct options are available on your selected date.
Mid-week departures often show lower prices than weekend travel on many routes. Use the date strip above to compare nearby days quickly.