Route guide · 1,750 miles
Cheap Flights from Boston to Denver
BOS → DEN · Nonstop 4h 3m · Live round-trip fares
Flying from Boston to Denver doesn't have to drain your wallet. This 1,750-mile hop takes about 4h 3m nonstop, and fares swing a lot depending on the week you pick. Travelers who book roughly 3–6 weeks out usually come out ahead — set a free alert and let the deals come to you.
Live fares for BOS → DEN are updating. Use the search below for real-time prices.
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See live fares
Updated daily
Flight time
4h 3m
Nonstop, typical
Distance
1,750 mi
BOS → DEN
Book ahead
3–6 weeks
Best window, typically
Nonstop airlines
3
Southwest Airlines, Spirit Airlines & more
Nonstop flights from Boston to Denver
Nonstop flights from Boston to Denver are flown by Southwest Airlines, Spirit Airlines, Delta Air Lines. The 1,750-mile trip takes about 4h 3m gate to gate, and nonstops are usually cheapest when booked 3–6 weeks ahead.
Booking insights: Boston → Denver
- Distance: 1,750 miles · nonstop flight time: 4h 3m.
- Cheapest upcoming week in the live data starts around Nov 5, with fares from $142.
- Fares tend to bottom out when you book about 3–6 weeks ahead — earlier than that rarely helps, later usually hurts.
- If your dates flex by a day or two, shifting to a midweek departure is the easiest saving there is.
- A free fare alert beats daily checking: we watch this route and ping you when prices drop.
Price trend
Cheapest departure weeks ahead
Departing around Nov 5 is currently the cheapest window — about $109 less than the nearest weeks. Based on recent fares found for this route; prices change quickly.
Cheapest month · Boston → Denver
November 2026
Every date's recent round-trip fare, at a glance.
Fares from
$142
Cheapest: Tue, Nov 10 — $142 · Priciest: Nov 15 — $182
Get this fare →Recent fares found for specific dates in November 2026. Blank days had no recent fare in our data — ask our team and we'll check them for you.
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Flying from Boston to Denver: what you need to know
The flight
At 1,750 miles, this is a long domestic flight — about 4h 3m gate to gate on a nonstop. It deserves a bit of planning: eat before you board or buy early (popular items sell out), and pick your seat with the flight length in mind.
Airlines on this route
Southwest Airlines, Spirit Airlines and Delta Air Lines fly this route nonstop. That matters more than it sounds: the cheapest fare on one carrier is rarely the same product as the cheapest on another. Checked-bag fees, free seat selection and change rules all differ, so compare the full trip cost before you pick a winner. See our airline guides for exactly what each carrier charges — then send an enquiry and we'll confirm the all-in price for your dates.
Leaving from Boston (BOS)
Plan to be at the airport two hours before a domestic departure — ninety minutes can work at smaller airports outside peak times, but security lines are the one variable you can't control. If you're checking a bag, add time rather than cutting it close. Our Boston airport guide covers terminals, parking and ground transport so you can plan the trip to the airport, not just the flight.
Arriving in Denver (DEN)
Before you land, know how you're getting from the airport to where you're staying — it's the part of the trip people forget to plan. The Denver airport guide lays out your ground options, from transit and shuttles to rideshares and rental cars. Flying back the other way? Check Denver to Boston fares — prices on the return direction often move on a different rhythm.
When to book
For a trip of 1,750 miles, booking 3–6 weeks ahead typically lands you in the sweet spot. Leave it to the final two weeks and prices usually climb as the cheapest seats sell out. If your dates are flexible, midweek departures are where the lower fares hide on most domestic routes.
Good to know before you go
- If you're traveling with only a carry-on, you can skip the bag-drop line entirely with mobile check-in.
- Download the airline's app before you fly; gate changes and delays show up there first.
- Nonstop time on this route is about 4h 3m — a one-stop itinerary needs to be a lot cheaper to be worth the extra hours.
- Tuesday and Wednesday departures are typically the cheapest days on domestic routes.
- Screenshot your fare before you enquire — prices move, and a saved fare helps our team match or beat it.
Boston to Denver flight FAQs
How long is the flight from BOS to DEN?
Nonstop flights from Boston to Denver take about 4h 3m and cover roughly 1,750 miles. One-stop itineraries add 2–4 hours depending on the layover city.
Are there nonstop flights from Boston to Denver?
Southwest Airlines, Spirit Airlines, Delta Air Lines typically operate nonstop flights from BOS to DEN. Nonstops are usually cheapest when booked 3–6 weeks ahead of departure.
What is the cheapest month to fly from Boston to Denver?
There's no single magic month, but prices on this route generally soften in the shoulder season, when demand dips after the holidays and again in early fall. A free fare alert is the easiest way to catch those windows.
How much are last minute flights from BOS to DEN?
Walking up to this route at the last minute is the expensive way to do it — prices inside 7 days of departure climb fast. The 3–6 weeks booking window is where the value sits.
What is a good round-trip deal from Boston to Denver?
A good deal is anything at or below the recent fares shown above. Set a free Airfare Deal alert and we'll ping you the moment fares drop.
Which airlines fly from Boston to Denver?
You'll mainly see Southwest Airlines, Spirit Airlines, Delta Air Lines on Boston to Denver. Checking each against the live fares below is the surest way to find the lowest price for your dates.
How early should I get to Boston airport for this flight?
Plan on two hours before departure for a domestic flight — ninety minutes can work at smaller airports outside peak times. If you're checking a bag, earlier is better; the bag-drop line, not the flight, is what runs late.
Do the cheapest fares on this route include a checked bag?
Usually not. Basic economy fares on most airlines include a carry-on but charge extra for checked bags, and seat selection can cost more too. Add up the real total before comparing — a slightly higher regular fare sometimes works out cheaper. Our team confirms the full breakdown with you before you pay.
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