$33+ Cheap flights from Ontario (ONT) to Colorado
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/10. Fares are subject to change and may not be available on all flights or dates of travel.
ONT — DEN
Nov 25 — Dec 21
Round-trip
1 adult, Economy
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Find cheap flights from Ontario to Colorado with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Ontario to Colorado
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Cheapest flights from Ontario to ColoradoExplore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 26, 2026.
Explore the most affordable flight options available from Ontario to Colorado. Find the lowest fares from popular airlines and budget airlines, with prices last updated on October 26, 2026.
This Frontier deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2511:40 am -
Nonstop2h 21m
Fri 11/279:20 am -
Nonstop2h 25m
Deal found 10/26![Frontier logo]()
$88
This Frontier deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 am -
Nonstop2h 21m
Sat 11/149:17 am -
Nonstop2h 25m
Deal found 10/25![Frontier logo]()
$90
This Super.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Sun 11/2210:52 pm -
Nonstop2h 22m
Deal found 10/24![Frontier logo]()
$92
This Cheapflightsfares deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:30 am -
Nonstop2h 21m
Sun 12/610:55 pm -
Nonstop2h 25m
Deal found 10/25![Frontier logo]()
$93
This iWofly deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2011:40 am -
Nonstop2h 21m
Wed 11/259:20 am -
Nonstop2h 25m
Deal found 10/26![Frontier logo]()
$94
This Mytrip deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:45 am -
Nonstop2h 21m
Wed 12/28:35 am -
2 stops10h 36m
Deal found 10/26![Frontier logo]()
$96
This Mytrip deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/146:30 am -
Nonstop2h 21m
Mon 11/169:19 pm -
2 stops20h 02m
Deal found 10/25![Frontier logo]()
$97
This Frontier deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/86:00 am -
Nonstop2h 24m
Thu 12/109:20 am -
Nonstop2h 25m
Deal found 10/25![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Sun 11/159:10 am -
Nonstop2h 25m
Deal found 10/23![Frontier logo]()
$99
This Frontier deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Tue 11/179:10 am -
Nonstop2h 25m
Deal found 10/24![Frontier logo]()
$101
This Delta deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:12 pm -
1 stop4h 12m
Sat 12/58:02 am -
1 stop5h 15m
Deal found 10/22![Delta logo]()
$255
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:50 pm -
1 stop4h 00m
Wed 11/187:50 am -
2 stops6h 25m
Deal found 10/23![Southwest logo]()
$260
Best flights from Ontario to ColoradoDiscover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
Discover carefully curated flight deals from Ontario to Colorado that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 26, 2026.
This United Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/215:00 am -
Nonstop2h 17m
Fri 11/2711:15 am -
Nonstop2h 18m
Deal found 10/25![United Airlines logo]()
$157
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/2312:00 pm -
1 stop9h 00m
Sun 1/316:40 pm -
1 stop5h 30m
Deal found 10/21![Southwest logo]()
$229
This Alaska Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/710:56 am -
1 stop9h 13m
Mon 1/117:54 pm -
2 stops22h 28m
Deal found 10/25![Alaska Airlines logo]()
$300
This Delta deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/136:00 am -
1 stop5h 39m
Mon 11/161:16 pm -
2 stops10h 44m
Deal found 10/25![Delta logo]()
$394
This American Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/79:29 am -
2 stops12h 05m
Wed 11/116:00 am -
1 stop4h 00m
Deal found 10/23![American Airlines logo]()
$441
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/213:00 pm -
1 stop4h 50m
Sun 1/242:45 pm -
2 stops7h 00m
Deal found 10/23![Southwest logo]()
$230
This Alaska Airlines deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/75:01 pm -
1 stop17h 09m
Fri 12/117:24 pm -
2 stops22h 32m
Deal found 10/25![Alaska Airlines logo]()
$300
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/105:00 am -
1 stop6h 21m
Wed 11/115:05 pm -
1 stop4h 46m
Deal found 10/22![United Airlines logo]()
$355
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/171:55 pm -
1 stop6h 50m
Fri 11/205:50 am -
1 stop5h 50m
Deal found 10/23![Southwest logo]()
$357
This Delta deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/76:00 am -
1 stop5h 30m
Wed 11/111:16 pm -
2 stops10h 44m
Deal found 10/24![Delta logo]()
$394
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/85:00 am -
1 stop6h 34m
Fri 3/192:45 pm -
1 stop6h 47m
Deal found 10/23![United Airlines logo]()
$369
This Delta deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/266:00 am -
1 stop3h 30m
Tue 3/306:50 pm -
1 stop5h 58m
Deal found 10/24![Delta logo]()
$404
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/145:00 am -
1 stop6h 36m
Tue 11/177:05 am -
1 stop6h 28m
Deal found 10/23![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/610:35 am -
2 stops8h 25m
Thu 12/36:30 am -
1 stop6h 40m
Deal found 10/22![Southwest logo]()
$391
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/85:00 am -
1 stop6h 26m
Fri 2/123:39 pm -
1 stop6h 38m
Deal found 10/24![United Airlines logo]()
$373
This Southwest deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/94:00 pm -
2 stops6h 50m
Sun 11/155:00 am -
2 stops6h 45m
Deal found 10/22![Southwest logo]()
$405
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/195:00 am -
1 stop6h 33m
Thu 11/265:00 am -
2 stops11h 24m
Deal found 10/22![United Airlines logo]()
$374
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/115:00 am -
1 stop6h 45m
Tue 11/173:11 pm -
1 stop6h 40m
Deal found 10/24![United Airlines logo]()
$374
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/272:35 pm -
Nonstop2h 20m
Mon 1/46:10 pm -
1 stop5h 50m
Deal found 10/23![Southwest logo]()
$414
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 1/911:20 am -
2 stops8h 13m
Sat 1/167:05 am -
1 stop6h 35m
Deal found 10/24![United Airlines logo]()
$378
This Southwest deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/244:25 pm -
2 stops7h 20m
Tue 12/13:05 pm -
2 stops6h 35m
Deal found 10/24![Southwest logo]()
$452
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/195:00 am -
1 stop6h 45m
Thu 11/265:30 am -
2 stops10h 54m
Deal found 10/22![United Airlines logo]()
$379
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/155:00 am -
1 stop4h 47m
Sun 11/225:30 am -
2 stops7h 59m
Deal found 10/24![United Airlines logo]()
$379
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/191:30 pm -
2 stops6h 20m
Mon 11/235:00 am -
2 stops6h 40m
Deal found 10/23![Southwest logo]()
$468
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/79:25 am -
2 stops11h 34m
Sat 11/145:30 am -
2 stops11h 03m
Deal found 10/24![United Airlines logo]()
$384
This United Airlines deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/311:20 am -
2 stops8h 42m
Sun 12/63:11 pm -
1 stop7h 00m
Deal found 10/24![United Airlines logo]()
$387
This United Airlines deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/255:00 am -
Nonstop2h 21m
Tue 1/57:35 pm -
Nonstop2h 25m
Deal found 10/22![United Airlines logo]()
$397
This United Airlines deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/109:25 am -
2 stops11h 34m
Sat 11/147:00 am -
2 stops12h 01m
Deal found 10/26![United Airlines logo]()
$399
This United Airlines deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/205:00 am -
Nonstop2h 17m
Fri 11/276:00 am -
1 stop7h 29m
Deal found 10/23![United Airlines logo]()
$407
This United Airlines deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/255:00 am -
1 stop6h 21m
Thu 12/39:24 am -
2 stops12h 14m
Deal found 10/21![United Airlines logo]()
$414
Last-minute flights from Ontario to ColoradoDiscover last-minute flight deals from Ontario to Colorado. Data last updated October 26, 2026 and is based on user searches.
Discover last-minute flight deals from Ontario to Colorado. Data last updated October 26, 2026 and is based on user searches.
This Southwest deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/96:50 pm -
1 stop4h 00m
Sun 11/155:00 am -
1 stop4h 00m
Deal found 10/22![Southwest logo]()
$283
This Frontier deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 am -
Nonstop2h 21m
Sat 11/149:17 am -
Nonstop2h 25m
Deal found 10/25![Frontier logo]()
$90
This Southwest deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/125:00 am -
1 stop3h 40m
Wed 11/181:40 pm -
1 stop9h 25m
Deal found 10/23![Southwest logo]()
$255
This Super.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Sun 11/2210:52 pm -
Nonstop2h 22m
Deal found 10/24![Frontier logo]()
$92
This Cheapflightsfares deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Mon 11/1610:29 pm -
Nonstop2h 22m
Deal found 10/26![Frontier logo]()
$93
This Frontier deal was found by Cheapflights users on 10/23. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Sun 11/159:10 am -
Nonstop2h 25m
Deal found 10/23![Frontier logo]()
$98
This Frontier deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 11/1411:52 am -
Nonstop2h 21m
Tue 11/179:10 am -
Nonstop2h 25m
Deal found 10/24![Frontier logo]()
$101
This Delta deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/195:04 pm -
1 stop4h 18m
Mon 11/236:08 pm -
1 stop6h 41m
Deal found 10/26![Delta logo]()
$331
This iWofly deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure iWofly is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/2011:40 am -
Nonstop2h 21m
Wed 11/259:20 am -
Nonstop2h 25m
Deal found 10/26![Frontier logo]()
$94
This Frontier deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/2511:40 am -
Nonstop2h 21m
Fri 11/279:20 am -
Nonstop2h 25m
Deal found 10/26![Frontier logo]()
$88
This Mytrip deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/256:45 am -
Nonstop2h 21m
Wed 12/28:35 am -
2 stops10h 36m
Deal found 10/26![Frontier logo]()
$96
This Southwest deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/269:05 am -
2 stops6h 15m
Tue 12/16:30 am -
1 stop10h 40m
Deal found 10/21![Southwest logo]()
$266
One-way flights from Ontario to ColoradoSearch for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
Search for one-way flight options from Ontario to Colorado. Find affordable one-way fares based on user searches. Data last updated October 26, 2026.
This Priceline deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 12/106:00 am -
Nonstop2h 24m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$33
This CheapOair deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/186:30 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$34
This Cheapflightsfares deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/106:30 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Frontier logo]()
$40
This Frontier deal was found by Cheapflights users on 10/26. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/246:45 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/26![Frontier logo]()
$44
This Super.com deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/126:30 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$49
This Super.com deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Super.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/1511:52 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$59
This Cheapflightsfares deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/26:00 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$60
This Mytrip deal was found by Cheapflights users on 10/21. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/175:07 pm -
2 stops14h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/21![Frontier logo]()
$61
This Cheapflightsfares deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/236:45 am -
Nonstop2h 21m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$62
This Mytrip deal was found by Cheapflights users on 10/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:00 pm -
2 stops17h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/22![Frontier logo]()
$63
This Cheapflightsfares deal was found by Cheapflights users on 10/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/3011:42 am -
Nonstop2h 25m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/25![Frontier logo]()
$64
This Mytrip deal was found by Cheapflights users on 10/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/72:53 pm -
2 stops16h 57m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/24![Frontier logo]()
$68
Find flight deals from Ontario to Colorado
Keep the following information in mind while searching for Ontario to Colorado flight deals. Data was last updated October 26, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $90 (Frontier) |
One-way from | $33 (Priceline) |
Popular in | July |
Cheapest in | February |
Average price | $250 |
Good round-trip deal | $270 or less |
Good one-way deal | $176 or less |
Cheapflights Fare Finder
Customize your flight search to find flights from Ontario to Colorado 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, Cheapflights users made 7,457,451 searches. Data last updated October 26, 2026.
Use the filters below to find and compare flights from Ontario to Colorado that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
OntarioColorado Springs
ONT Ontario - COS Colorado Springs
ONTCOS
Ontario
Tue 12/15
5:04 pm-10:24 pm
1 stop4h 20m
Colorado Springs
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$128
OntarioColorado Springs
ONT Ontario - COS Colorado Springs
ONTCOS
Ontario
Tue 11/17
5:04 pm-10:22 pm
1 stop4h 18m
Colorado Springs
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$128
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sun 1/10
1:42 pm-5:01 pm
Nonstop2h 19m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$149
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Mon 11/9
5:00 am-8:17 am
Nonstop2h 17m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$151
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sat 11/21
5:00 am-8:17 am
Nonstop2h 17m
Denver Intl
Fri 11/27
11:15 am-12:33 pm
Nonstop2h 18m
$157
OntarioColorado Springs
ONT Ontario - COS Colorado Springs
ONTCOS
Ontario
Fri 1/8
7:00 am-5:14 pm
2 stops9h 14m
Colorado Springs
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$193
OntarioColorado Springs
ONT Ontario - COS Colorado Springs
ONTCOS
Ontario
Wed 12/30
5:00 am-12:56 pm
1 stop6h 56m
Colorado Springs
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$198
Quickest round-trip
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Tue 12/15
1:40 pm-4:55 pm
Nonstop2h 15m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$199
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sat 11/21
5:00 am-8:17 am
Nonstop2h 17m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$199
OntarioDenver
ONT Ontario - DEN Denver Intl
ONTDEN
Ontario
Sun 11/22
5:00 am-8:17 am
Nonstop2h 17m
Denver Intl
Wed 12/31
12:00 am-11:00 pm
Nonstop0h 00m
$201
Showing 1-10 of 60 resultsSorted by cheapest first
Best time to book a flight from Ontario to Colorado
Have a flexible travel schedule? Discover the best time to fly to Colorado from Ontario with our price prediction graph.
ONT-DEN
ONT-GJT
ONT-COS
ONT-DRO
ONT-MTJ
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.
Cheapflights Insights
Everything you need to know about your flight from Ontario to Colorado
ONT-USCO
ONT-DEN
ONT-GJT
ONT-COS
ONT-DRO
What is the cheapest month to book a flight from Ontario to Colorado?
Currently, February is the cheapest month in which you can book a flight from Ontario to Colorado (average of $181). Flying from Ontario to Colorado in June is currently the most expensive (average of $345). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.
What is the cheapest time of day to fly from ONT to CO?
Find hourly flight availability from Ontario to Colorado. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated October 26, 2026.
It’s typically best to fly out from Ontario to Colorado in the evening. Doing so could potentially save you 52% on the flight price compared to flying at noon, which is usually more expensive.
How much does it cost to fly round-trip from Ontario to Colorado?
Airfare is below average for this route at the moment.
Ontario to Colorado flights typically cost between $168 and $361 in November.The cheapest round-trip price found within the last 5 days was $90 on Frontier (Nov 10-Nov 14).
How far ahead should I book a flight from Ontario to Colorado?
The price you pay for your flight from Ontario to Colorado may vary depending on when you book. For the best chance of a lower fare, look to book 71 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
What is the cheapest day to fly from Ontario to Colorado?
Use this chart to determine the cheapest time to fly round-trip from Ontario to Colorado. Price data was last updated on October 17, 2026.
Travelers seeking maximum savings on their Ontario to Colorado flight should consider departing on Saturday evenings when fares are most often at their lowest. Monday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Reviews of airlines servicing Colorado
Get insights into the airlines that provide service to Colorado. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Colorado. Reviews last updated October 26, 2026.
See what other customers who have flown with Southwest,Delta, andUnited Airlines from Ontario to Colorado have to say. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Crew
8.6
Comfort
8.0
Boarding
8.1
Entertainment
7.4
Food
7.0
Overall
7.9
Reviews
1 / 20
2.0
MediocreThomas,Dec 2025
SEA - DEN
Related info for your journey
Find useful and relevant information for your journey from Ontario to Colorado. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
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Alternative routes for Ontario to Colorado
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Complete your trip
Complete your trip to Colorado by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Ontario to Colorado by cabin class
Find flights from Ontario to Colorado, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Ontario and Colorado flights
Browse other Ontario and Colorado flight options. Last updated on October 26, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Ontario to Colorado flights
Consider these flights traveling from Ontario to Colorado.
Top 5 airlines flying from Ontario to Colorado
Discover the top 5 airlines that operate flights from Ontario to Colorado. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated October 26, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$63 | Average$207 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$98 | Average$277 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$157 | Average$394 | FlexibilityNo cancel fee | On-time63% | |
| Cheapest$157 | Average$317 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$211 | Average$389 | FlexibilityNo cancel fee | On-time71% |