Flights Boston → Chicago
As of October 2026, economy flights from Boston to Chicago have a typical range USD 355–451, median USD 355. Full range across all 271 offers: USD 258–995. We found 9% of 271 offers from budget carriers (around USD 350) and 91% from full-service carriers (around USD 355).
Preview snapshot — prices change. Search for live results.
Data collected by LetsFG's multi-source price checks — every airline and the major booking sites checked for this route. How we collect data →
Best offers by airline: Boston → Chicago
Based on 271 offers · October 2026. Prices and availability change — run a live search to confirm.
Bag & seat fees: Boston → Chicago
Add-on pricing from the cheapest available offer per airline · October 2026 · USD
| Airline | Carry-on | Checked bag | Seat selection |
|---|---|---|---|
| Frontier | — | — | — |
| jetBlue | Included | USD 35 | — |
| United Airlines | Included | USD 35 | — |
| Delta | Included | USD 35 | — |
| American Airlines | Included | USD 35 | — |
| Southwest | — | USD 90 | — |
| Delta | — | USD 90 | — |
| Southwest Airlines | Included | Included | — |
Fees are estimates from the prices we checked and may not reflect your specific itinerary, booking class, or payment method. Run a live search for exact pricing.
How much do flights from Boston to Chicago cost?
Based on 271 offers · October 2026
Boston to Chicago flights ranged from USD 258 to USD 995 across 271 offers analyzed in October 2026. Two fare clusters detected: budget fares around 369 and premium fares around 663 The chart below shows how prices distributed across all 271 offers.
These 271 offers (October 2026) span multiple departure dates and booking windows — your travel dates may fall anywhere in this distribution. Only a live search shows where your specific trip lands.
50% of offers priced between USD 355 and USD 365
What hidden fees do Boston to Chicago flights charge?
Ancillary fees — bags, seat selection, and payment surcharges — can add 10–25% to the base fare on Boston to Chicago routes. The breakdown below is based on 271 offers analyzed in October 2026.
| Carrier | Avg fee (USD) | % of base fare |
|---|---|---|
| F9 | 10 | 4% |
| B6 | 45 | 13% |
| UA | 43 | 11% |
| DL | 45 | 12% |
| AA | 57 | 14% |
| Southwest | 90 | 24% |
| Delta | 90 | 24% |
| WN | 0 | 0% |
Southwest: base ~USD 285 + fees USD 90 = ~USD 375 total. Delta Air Lines: base ~USD 320 + fees USD 45 = ~USD 365 total.
Southwest's USD 90 ancillary fees narrow the gap with Delta Air Lines's lower-fee model — the USD 35 base difference shrinks to USD 10 after fees. Always compare total cost, not just the advertised base fare.
Estimates based on median total minus average ancillary fee. Actual base fares vary by itinerary.Southwest charges 9.0x more in ancillary fees than F9 on this route. Compare total-cost options when booking.
Run your search to see itemized fees for your itineraryWhich airline is cheapest from Boston to Chicago?
9 airlines flew Boston to Chicago in this dataset. The route shows a clear split between low-cost and full-service carriers. Knowing the airline isn't enough — the typical fare range below shows how far prices swing on each one. Median and range include all fees we recorded.
Even on the cheapest airline (Frontier Airlines), fares ranged USD 260–275 in this snapshot. Your exact price depends on your dates and how far ahead you book — run a live search to see your number →
| Airline | Offers | Typical range (USD) | Median (USD) | Fees (USD) |
|---|---|---|---|---|
 Frontier Airlines | 2 | 260–275 | 268 | 10 (4%) |
 Frontier | 20 | — | 316 | n/a |
 B6 | 2 | 348–352 | 350 | 45 (13%) |
 United Airlines | 91 | 355–365 | 355 | 43 (12%) |
 American Airlines | 112 | 355–651 | 355 | 57 (16%) |
 Delta Air Lines | 30 | 355–365 | 365 | 45 (12%) |
 Southwest | 5 | 369–378 | 375 | 90 (24%) |
 Delta | 2 | — | 375 | 90 (24%) |
 Southwest Airlines | 7 | 418–470 | 431 | 0 (0%) |
Where do the best Boston → Chicago prices come from?
We checked direct airlines, travel agencies, and meta-search for this route. On this route the lowest median came from meta-search sources, but the cheapest channel shifts by route and date — which is exactly why a live search across all of them wins.
We compare every airline and the major booking sites but never disclose which — that's our edge. Prices are the ones we observed and aren't official data from any platform. Run a live search and we bring you the cheapest, wherever it is.
Key facts: Boston to Chicago flights
- Full-service carriers on Boston–Chicago cost 1.0x more than budget airlines (USD 362 vs USD 348 median; overall median USD 355).
- Southwest charges 9.0x more in ancillary fees than F9 — USD 90 vs USD 10 avg per booking.
- The same route priced USD 384 apart depending on where it was booked — the lowest median was USD 268. We search every airline and the major booking sites at once so you always see that lowest price.
Frequently asked questions
- How much does a flight from Boston to Chicago cost?
- Based on 271 offers analyzed, Boston to Chicago flights range from USD 258 to USD 995, with a median price of USD 355. Search for your specific dates →
- What hidden fees should I expect on Boston to Chicago flights?
- On average, ancillary fees (bags, seat selection) add USD 50 to the base fare on Boston to Chicago flights. See itemized fees for your itinerary →
- Which airline is cheapest on Boston to Chicago including all fees?
- Frontier Airlines has the lowest median fare on Boston to Chicago at USD 268 (median across 2 offers in our snapshot). Check which airline wins on your dates →
- Which booking site has the cheapest Boston–Chicago flights?
- It depends on your dates — no single site is always cheapest. We search every airline and the major booking sites at once (travel agencies and meta-search included) and surface whichever is lowest; the best median in this snapshot was USD 268. Run a live search and we'll find the cheapest for you →
- Why do prices vary so much on Boston to Chicago routes?
- Boston to Chicago has 9 airlines competing, creating a price range from USD 258 to USD 995 across 271 offers. There are two distinct fare clusters on this route: budget options and premium fares. Find where your trip lands in the distribution →
9 airlines, two price clusters — find which fits your budget
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